Every Solo Chainsaw Model: Production Years and Specifications

Solo chainsaws are unusually difficult to catalog. The company reused model numbers, sold the same basic saw under different badges, changed suffixes by market, and left behind no public register that covers the whole line. A 1960s Solo 632, for example, has little in common with the 32 cc Solo 632 sold in the 1980s.

This guide covers every documented Solo and solo by AL-KO chainsaw model found in manufacturer manuals, catalogs, parts lists, period literature, specialist archives, and surviving-machine records through August 2026. It includes gasoline, corded-electric, battery, top-handle, and commercially sold rescue conversions. Where the evidence does not support an exact date or specification, the entry says so plainly instead of borrowing a figure from a similar saw.

A short history of Solo chainsaws

Solo was founded in 1948 in southern Germany. The company name came from its early portable engine products, which one person could operate. Solo’s own company history dates the business to 1948, while surviving saws and period records place the first production Solo chainsaw in 1958 after a 1957 pre-series.

The early line moved quickly from the large direct-drive Rex to compact horizontal-cylinder saws, anti-vibration VA models, Farmer retail versions, and an exceptionally broad professional range. Solo also experimented. The 611 Twin used an inline two-cylinder engine, the Combi 250 accepted several powered attachments, and the 649 brought an electric motor into the 1960s range.

In 2014 AL-KO acquired Solo’s chainsaw and brushcutter product program and associated trademark rights, rather than the whole Solo company. Contemporary trade reporting on the acquisition said production would move to AL-KO’s Obdach, Austria, plant during 2014. AL-KO’s corporate timeline also records the 2014 acquisition. Existing Solo saws continued for a time, and later products were sold as solo by AL-KO.

First-generation Solo chainsaws, 1958 to 1968

The earliest machines are best understood as a succession of badge and engineering changes, not a tidy numbered range.

Solo-Säge, Solo Rex, and Solo 125

• Production years:
  • Solo-Säge 1958–1960;
  • Solo Rex 1960–1965;
  • Solo 125 1961–1965
• Displacement: 125 cc (7.6 cu. in.)
• Power: 3.7 kW (5 DIN PS); also advertised as 7 SAE hp in North America
• Weight: 11.4 kg (25.1 lb) with a 17 in. bar and chain
• Bar length: 17–30 in. (43–75 cm)

The three names identify successive badges on Solo’s first direct-drive production platform. The Solo-Säge followed a 1957 pre-series, the Solo Rex became the regular sales name in October 1958, and “125” reflected the short-lived practice of naming a saw for its displacement.

Solo Super Rex and Solo 140

• Production years: 1963–1967
• Displacement: 142 cc (8.7 cu. in.); the badge rounded this to 140
• Power: 5.1 kW (7 DIN PS); 10 SAE hp was used in export advertising
• Weight: 11.7 kg (25.8 lb) with a 21 in. bar and chain
• Bar length: 17–36 in. (43–91 cm)

The Super Rex was the high-output version of the Rex architecture. “140” is a model name rather than an exact displacement statement, a useful warning against deriving Solo specifications from the badge alone.

Solo 70 Mark II and Solo 626

• Production years: 70 Mark II 1963–1965; 626 1964–circa 1966
• Displacement: 70 cc (4.3 cu. in.); one bore-and-stroke calculation yields 72.3 cc
• Power: 2.6 kW (3.5 DIN PS), often described in German collector records as 4 PS; 5 SAE hp export rating
• Weight: 9.9 kg (21.8 lb) with a 16 in. bar and chain
• Bar length: 17–21 in. (43–53 cm)

The 626 was the revised designation for the 70 Mark II platform, type 60126. The differing 70 and 72.3 cc figures arise from nominal naming versus a calculation based on published bore and stroke, not from evidence of two distinct production engines.

Solo 50 and first-generation Solo 630

• Production years: Solo 50 in 1965; Solo 630 1965–1967
• Displacement: 50 cc (3.1 cu. in.)
• Power: 2.2 kW (3 DIN PS); 3.5 SAE hp in export data
• Weight: 6.5 kg (14.3 lb), powerhead only
• Bar length: Unknown

The 50 was a short pre-series-style introduction and the 630 was its regular production successor. These are unrelated to the smaller 36.3 cc Solo 630 sold around the turn of the century.

First-generation Solo 632

• Production years: 1965–1967
• Displacement: 72 cc (4.4 cu. in.)
• Power: 2.9 kW (4 DIN PS)
• Weight: 7.0 kg (15.4 lb)
• Bar length: Unknown

This was the larger member of the 50/630 family. It should not be confused with the completely different 32 cc Solo 632 and Farmer 32 of the 1980s.

Solo Combi 250 with Solo 637 saw attachment

• Production years: 1966–1968
• Displacement: 50 cc (3.1 cu. in.)
• Power: 2.2 kW (3 DIN PS)
• Weight: 8.5 kg (18.7 lb) as the equipped chainsaw attachment
• Bar length: Unknown

The Combi 250 was a multi-purpose engine unit that could power a pump, generator, drill, and other attachments. Fitted with the genuine Solo 637 chainsaw attachment it became a production chainsaw, distinct from the later 637 top-handle model.

Solo 611 Twin, 100 cc and 110 cc versions

• Production years: 1965–at least 1974
• Displacement: 100 cc (6.1 cu. in.) or 110 cc (6.7 cu. in.), using paired 50 cc or 55 cc cylinders
• Power: About 4.0 kW (5.5 DIN PS)
• Weight: 11.9 kg (26.2 lb) with a 17 in. bar and chain
• Bar length: 17 in. (43 cm) documented

The inline two-cylinder 611 Twin is Solo’s most unusual production chainsaw. Surviving machines document both 2 x 50 cc and 2 x 55 cc engine versions, so treating every Twin as exactly 110 cc is incorrect. It is also entirely different from the later single-cylinder Solo 611.

First-generation Solo 635

• Production years: 1967–early 1970s
• Displacement: 92 cc (5.6 cu. in.)
• Power: 4.0 kW (5.5 DIN PS); advertised as 8 SAE hp in export literature
• Weight: 11.6 kg (25.6 lb)
• Bar length: 17–25 in. (43–63 cm)

The 92 cc 635 followed the Rex in Solo’s large-saw line. It has no engineering relationship to the 36.3 cc 635 ECO introduced decades later.

Solo 635 Super, Solo 642, and Australian Solo 636

• Production years: 1967–1976
• Displacement: 106 cc (6.5 cu. in.)
• Power: 4.0 kW (5.5 DIN PS); some specialist tables give 4.8 kW (6.5 PS), while export advertising used 9 SAE hp
• Weight: 12.2 kg (26.9 lb)
• Bar length: 17–42 in. (43–106 cm), period family range

These are regional and chronological names for the larger-bore 635 platform. The 636 badge was used in Australia and must not be confused with the later 36.3 cc Solo 636.

Early Solo 640 and Solo 640-C

• Production years: 1967–1971
• Displacement: 67 cc (4.1 cu. in.)
• Power: 2.9 kW (4 DIN PS)
• Weight: 6.5 kg (14.3 lb) with a 16 in. bar and chain
• Bar length: 14–24 in. (35–60 cm)

The C suffix identified a decompression-equipped version. This 67 cc family is unrelated to the 40.2 cc Solo 640 sold about three decades later.

Early Solo 641 Super

• Production years: 1967–1971
• Displacement: Reported as 72 cc (4.4 cu. in.)
• Power: 3.3 kW (4.5 DIN PS)
• Weight: About 6.0 kg (13.2 lb)
• Bar length: 14–24 in. (35–60 cm), documented 640-family range

The 641 Super was the higher-output member of the early 640 family and used decompression equipment. It is not the 41.5 cc Solo 641 and Farmer 40 introduced in 1986.

Early Solo 645 hobby

• Production years: 1967–1971
• Displacement: 67 cc (4.1 cu. in.)
• Power: 2.2 kW (3 DIN PS)
• Weight: 6.0 kg (13.2 lb)
• Bar length: 14–24 in. (35–60 cm), documented 640-family range

The lowercase “hobby” badge marked a detuned 640-family saw. The later 44.3 cc Solo 645 and Greenline 45 reused the number but not the engine.

VA and farm-saw families of the 1970s

VA was Solo’s German abbreviation for vibration damping, while North American references often reverse it to AV. Later suffixes added electronic ignition or a chain brake.

Solo 644 VA

• Production years: 1969–1971
• Displacement: 67 cc (4.1 cu. in.)
• Power: 2.9 kW (4 DIN PS)
• Weight: 7.0 kg (15.4 lb)
• Bar length: 19–27 in. (48–68 cm)

The 644 VA adapted the early 640 concept to Solo’s first VA series, adding a steel-spring-assisted anti-vibration system and a substantially revised engine construction.

Solo 610, Solo 610 VA, and Solo 610 X

• Production years: 1972–1980; a 610 X parts list is dated 1977
• Displacement: 35 cc (2.1 cu. in.)
• Power: 1.6 kW (2.2 DIN PS); 3 SAE hp appears in export data
• Weight: 6.5 kg (14.3 lb) with a 14 in. bar and chain
• Bar length: 14–16 in. (35–40 cm)

The 610 was the smallest Solo gasoline saw of its period. VA identifies the anti-vibration version; the exact equipment represented by the documented 610 X suffix has not been established from a surviving specification sheet.

Single-cylinder Solo 611, Solo 611 VA, and Farmer 11

• Production years: Introduced in 1967 in an export reference; documented in Solo literature by 1976; end year Unknown
• Displacement: 47 cc (2.9 cu. in.)
• Power: About 2.2 kW (3 PS)
• Weight: 6.0 kg (13.2 lb) with a 16 in. bar and chain
• Bar length: 16–18 in. (40–45 cm)

This is the conventional single-cylinder 611, not the 100/110 cc Twin. Farmer 11 was the yellow retail-market version, while 611 VA added vibration isolation and later chain-brake equipment.

Solo 615 and Solo 615 AV

• Production years: By 1972–1978
• Displacement: 45 cc (2.7 cu. in.)
• Power: 2.2 kW (3 DIN PS); 4 SAE hp in export data
• Weight: 6.3 kg (13.9 lb)
• Bar length: 14–16 in. (35–40 cm)

Surviving 1972 operating literature establishes the model by that year, and Solo’s parts archive separately lists 615 and 615 AV material. The AV badge is frequently written VA on surviving European machines.

Solo 615AVK

• Production years: Unknown
• Displacement: 44 cc (2.7 cu. in.)
• Power: Unknown
• Weight: Unknown
• Bar length: Unknown

The 615AVK appears as an exact model designation in a specialist chainsaw database and carburetor application material, with a stated 44 cc displacement. It is kept separate because that figure differs from the 45 cc 615, but no period Solo specification sheet has yet surfaced.

First-version Solo 616, Farmer 16, and 616 VA Electronic

• Production years: Circa 1970s; the braked 616 VA Electronic is documented for 1975–1978
• Displacement: 45 cc (2.7 cu. in.)
• Power: 2.2 kW (3 DIN PS); 4 SAE hp in export data
• Weight: 7.5 kg (16.5 lb) for the 616 VA Electronic; another export configuration is 7.4 kg (16.25 lb) with cutting equipment
• Bar length: 14–16 in. (35–40 cm)

Farmer 16 was the retail-market badge. “Electronic” identified electronic ignition, and the later pictured VA Electronic version added a chain brake.

Late Solo 616 and Solo 616 AV, 52 cc version

• Production years: Circa late 1970s; the 616 AV is documented through 1978
• Displacement: 52 cc (3.2 cu. in.)
• Power: 3.4 kW (4.5 SAE hp)
• Weight: 7.9 kg (17.5 lb) with a 16 in. bar and chain
• Bar length: 14–20 in. (35–50 cm)

The late 52 cc 616 is a genuine displacement-changing revision and cannot share a single specification with the earlier 45 cc 616.

Solo 620 VA and Solo 620 AV

• Production years: 1968–1981
• Displacement: 52 cc (3.2 cu. in.)
• Power: 2.4 kW (3.2 DIN PS); up to 4.5 SAE hp in export data
• Weight: 7.0 kg (15.4 lb)
• Bar length: 16–20 in. (40–51 cm)

This gasoline 620 must not be confused with Solo’s 2000 W corded-electric 620. VA and AV are market-orderings of the same anti-vibration designation.

Solo 650 VA, Solo 650 AV, and 650 VA pre-series

• Production years: Pre-series in 1969; regular production 1969–1978
• Displacement: 62 cc (3.8 cu. in.)
• Power: 2.9 kW (4 DIN PS); 6 SAE hp in export data
• Weight: 7.0 kg (15.4 lb)
• Bar length: 16–20 in. (40–51 cm)

A documented 1969 pre-series has detail differences from the regular 650 VA. The 62 cc saw shares much of the 620 VA architecture but not its piston and cylinder, and it is unrelated to later saws also called 650.

Solo 655 and Solo 655 AV

• Production years: 1968–1976
• Displacement: 70 cc (4.3 cu. in.)
• Power: 3.7 kW (5 DIN PS); 6.5 SAE hp in export data
• Weight: 7.5 kg (16.5 lb)
• Bar length: 16–20 in. (40–51 cm)

Solo 660 and Solo 660 AV

• Production years: 1968–1984
• Displacement: 81 cc (4.9 cu. in.)
• Power: 4.4 kW (6 DIN PS); 7 SAE hp in export data
• Weight: 7.5 kg (16.5 lb)
• Bar length: 16–20 in. (40–51 cm)

The 660 had the longest documented run of this VA family, remaining in specialist inventories through 1984.

Compact and Farmer models of the 1980s

Solo used yellow Farmer badges alongside red Solo models and reused several older numbers.

Solo 600

• Production years: 1976–1984
• Displacement: 32 cc (2.0 cu. in.)
• Power: 1.8 kW (2.5 DIN PS)
• Weight: 4.9 kg (10.75 lb) with a 12 in. bar and chain
• Bar length: 12 in. (30 cm)

The compact 600 preceded the 631 and is identifiable by unusually small fuel and oil tanks. Its layout sits between a top-handle and a conventional rear-handle saw.

Solo 605 and Solo 605 AV

• Production years: 1982–1985
• Displacement: 32 cc (2.0 cu. in.)
• Power: Unknown
• Weight: Unknown
• Bar length: 14–16 in. (35–40 cm)

The 605 was the 32 cc member of the short-lived 605/606 pair and a direct precursor to the 632-family compact saws.

Solo 606 and Solo 606 AV

• Production years: 1982–1985
• Displacement: 38 cc (2.3 cu. in.)
• Power: Unknown
• Weight: Unknown
• Bar length: 14–16 in. (35–40 cm)

The 606 used the larger 38 cc cylinder in the same compact concept and led into the Solo 638.

Solo 631, Solo 631K, and Farmer 31

• Production years: 1984–1987
• Displacement: 32 cc (2.0 cu. in.)
• Power: Unknown
• Weight: 4.9 kg (10.8 lb) with a 14 in. bar and chain
• Bar length: 14–16 in. (35–40 cm)

The 631 followed the 600, while Farmer 31 was its yellow retail badge. The 631K designation appears in a model-specific export record; its documented core specifications match the 631 family.

Second-generation Solo 632 and Farmer 32

• Production years: 1983–1986
• Displacement: 32 cc (2.0 cu. in.)
• Power: Unknown
• Weight: 4.5 kg (9.9 lb) without cutting equipment; 5.5 kg (12.1 lb) with a 14 in. bar and chain
• Bar length: 14–16 in. (35–40 cm)

This 32 cc 632 is not a revision of the 72 cc 1965 saw. The shared number is one of the most common causes of incorrect Solo model lists.

Solo 638 and Farmer 38

• Production years: 1984–1986
• Displacement: 38 cc (2.3 cu. in.)
• Power: Unknown
• Weight: 4.5 kg (9.9 lb) without cutting equipment; 5.5 kg (12.1 lb) with a 14 in. bar and chain
• Bar length: 14–16 in. (35–40 cm)

The 638 was the larger-cylinder partner to the 632 and carried the same Farmer 38 relationship.

Solo 634 and Farmer 33

• Production years: 1986–2000
• Displacement: 34 cc (2.1 cu. in.)
• Power: 1.6 kW (2.1 hp)
• Weight: 4.5 kg (9.9 lb), dry without bar and chain
• Bar length: 14 in. (35 cm) standard; 14–16 in. (35–40 cm) documented family range

Farmer 33 is confirmed by the shared Solo parts documentation. The 634 replaced the 32 cc compact generation and remained listed much longer than its Farmer siblings.

Solo 641 and Farmer 40, 1980s generation

• Production years: 1986–circa 1993
• Displacement: 41.5 cc (2.5 cu. in.)
• Power: 2.0 kW (2.7 hp)
• Weight: 4.5 kg (9.9 lb), dry without bar and chain
• Bar length: 15 in. (38 cm) standard; up to 18 in. (45 cm) documented

Farmer 40 was the yellow version of this generation. It is unrelated to the 72 cc 641 Super and should also not be confused with Einhell’s non-Solo-badged PKS 40 AV Profi derivative.

Professional Solo chainsaws from 1983 to 2001

Solo’s professional families overlapped heavily. SP indicated a lower-output semi-professional version, and H identified heated handles on models where it was offered.

Solo 647 and Farmer 46

• Production years: 1983–1995
• Displacement: 47 cc (2.9 cu. in.)
• Power: 2.4 kW (3.2 hp)
• Weight: 5.9 kg (13.0 lb) without cutting equipment
• Bar length: 13–20 in. (33–50 cm)

Farmer 46 used the same basic 647/654 architecture in a yellow retail-market configuration.

Solo 654

• Production years: 1984–1995
• Displacement: 54 cc (3.3 cu. in.)
• Power: 2.9 kW (3.9 hp)
• Weight: 5.9 kg (13.0 lb) without cutting equipment
• Bar length: 13–20 in. (33–50 cm)

The 654 was the larger professional member of the 647 family, with the same listed dry weight but an additional 7 cc of displacement.

Solo 662

• Production years: 1987–early 2000s
• Displacement: 63 cc (3.8 cu. in.)
• Power: 3.16 kW (4.2 hp)
• Weight: 6.3 kg (13.9 lb), dry without bar and chain
• Bar length: 16–28 in. (40–71 cm); 16 in. was the standard manual configuration

Solo 667

• Production years: 1987–early 2000s
• Displacement: 69 cc (4.2 cu. in.)
• Power: 3.6 kW (4.8 hp)
• Weight: 6.3 kg (13.9 lb), dry without bar and chain
• Bar length: 16–36 in. (40–91 cm); 16 in. was the standard manual configuration

The official 662/667 manual gives 3.6 kW for the 667, correcting the rounded 3.5 kW figure repeated in some later lists. Its powerhead also became the basis of a commercial SureVent rescue-saw conversion.

Solo 667 SP

• Production years: Circa late 1980s–early 2000s
• Displacement: 69 cc (4.2 cu. in.)
• Power: 3.2 kW (4.3 hp)
• Weight: 6.3 kg (13.9 lb), dry without bar and chain
• Bar length: 16–36 in. (40–91 cm), shared 667-family range

The SP kept the 667’s displacement but used a lower output rating. That material difference warrants a separate entry rather than treating SP as a cosmetic suffix.

Solo 670

• Production years: 1985–1995
• Displacement: 69 cc (4.2 cu. in.)
• Power: 4.0 kW (5.4 hp)
• Weight: 7.5 kg (16.5 lb), dry without bar and chain
• Bar length: 16–42 in. (40–106 cm)

Solo 680

• Production years: 1985–1995
• Displacement: 81 cc (4.9 cu. in.)
• Power: 5.1 kW (6.8 hp)
• Weight: 7.5 kg (16.5 lb), dry without bar and chain
• Bar length: 16–42 in. (40–106 cm)

First-version Solo 690

• Production years: Circa 1985–1990
• Displacement: 90 cc (5.5 cu. in.)
• Power: 5.4 kW (7.2 hp)
• Weight: 7.5 kg (16.5 lb), dry without bar and chain
• Bar length: 16–42 in. (40–106 cm)

The first 690 shares the large 670-family chassis. Solo later retained the 690 badge while changing the bore-and-stroke combination, so the 1991 version is listed separately.

Solo 603

• Production years: 1986–1995
• Displacement: 103 cc (6.3 cu. in.)
• Power: 5.7 kW (7.6 hp)
• Weight: 7.9 kg (17.4 lb), dry without bar and chain
• Bar length: 24–42 in. (60–106 cm)

Solo called its 103 cc flagship the 603 so it could remain within the established three-digit naming system rather than use “6103.”

Second-version Solo 690

• Production years: 1991–2001
• Displacement: 90 cc (5.5 cu. in.)
• Power: 5.45 kW (7.3 hp)
• Weight: 7.9 kg (17.4 lb), dry without bar and chain
• Bar length: 16–42 in. (40–106 cm); 24 in. (60 cm) was a documented standard configuration

North American material explicitly called this “Second Version.” Its altered stroke and bore distinguish it from the earlier 690 even though total displacement remained 90 cc.

The 1990s Solo range

Several numbers were reused again in this period. Greenline models were retail-market versions that typically used low-profile 3/8-inch cutting equipment instead of the regular model’s .325-inch setup. Deko, sometimes written Deco, indicates decompression equipment.

Solo 639, Solo 639 Deko, and Greenline 39

• Production years: 1993–2007
• Displacement: 38.2 cc (2.3 cu. in.)
• Power: 1.9 kW (2.5 hp)
• Weight: 4.5 kg (9.9 lb), dry without bar and chain
• Bar length: 15 in. (38 cm) standard; 15–20 in. (38–50 cm) documented

Greenline 39 is the retail badge for this platform. The 639 Deko added a decompression valve without changing the core engine specification.

Modern Solo 645, Solo 645 Deko, and Greenline 45

• Production years: 1998–2007
• Displacement: 44.3 cc (2.7 cu. in.)
• Power: 2.2 kW (3.0 hp)
• Weight: 4.5 kg (9.9 lb), dry without bar and chain
• Bar length: 15 in. (38 cm) standard; 15–20 in. (38–50 cm) documented

This is the later chain-brake-equipped 645, not the 67 cc hobby saw of 1967. Greenline 45 and the decompression-equipped 645 Deko remain searchable here as variants.

Modern Solo 650 and Solo 650 Deko

• Production years: 2002–2007
• Displacement: 51 cc (3.1 cu. in.)
• Power: 2.4 kW (3.2 hp)
• Weight: 4.5 kg (9.9 lb), dry without bar and chain
• Bar length: 15 in. (38 cm) standard; 15–20 in. (38–50 cm) documented

The 51 cc modern 650 was the largest member of the 639/645/650 platform. It has no connection to the 62 cc 650 VA.

Square-chassis Solo 644 SP

• Production years: 1989–early 2000s
• Displacement: 44.3 cc (2.7 cu. in.)
• Power: 2.3 kW (3.1 hp)
• Weight: 4.4 kg (9.7 lb), dry without bar and chain
• Bar length: 16–20 in. (40–50 cm)

This SP is the lower-output square-chassis 644, not the round-body 45 cc 644 introduced in 2006.

Square-chassis Solo 644 and Solo 644 H

• Production years: 1987–2007
• Displacement: 44.3 cc (2.7 cu. in.)
• Power: 2.6 kW (3.5 hp)
• Weight: 4.55 kg (10.0 lb), dry without bar and chain
• Bar length: 13–20 in. (33–50 cm)

H denotes the heated-handle version. The square body and 32 mm stroke are practical ways to separate this generation from the later round-chassis 644.

Square-chassis Solo 651 SP

• Production years: 1991–2007
• Displacement: 50.8 cc (3.1 cu. in.)
• Power: 2.65 kW (3.6 hp)
• Weight: 4.85 kg (10.7 lb), dry without bar and chain
• Bar length: 16–20 in. (40–50 cm)

Square-chassis Solo 651 and Solo 651 H

• Production years: 1991–2007
• Displacement: 50.8 cc (3.1 cu. in.)
• Power: 2.94 kW (3.9 hp)
• Weight: 4.85 kg (10.7 lb), dry without bar and chain
• Bar length: 16–20 in. (40–50 cm)

The H version added heated handles. Solo reused both 651 and 651 SP on a heavier round-chassis family from 2006, so chassis shape matters when ordering parts.

Compact and top-handle Solo chainsaws around 2000

Modern Solo 630

• Production years: Circa 2001–2007
• Displacement: 36.3 cc (2.2 cu. in.)
• Power: 1.5 kW (2.0 hp)
• Weight: 3.95 kg (8.7 lb), dry without bar and chain
• Bar length: 12–16 in. (30–40 cm)

This compact hobby saw shared its basic engine concept with the contemporary 640 and top-handle 633/637. Fleurelle sold a non-Solo-badged derivative as the KSB 2035, which is outside this inventory.

Modern Solo 640

• Production years: Circa 2001–2007
• Displacement: 40.2 cc (2.5 cu. in.)
• Power: 1.97 kW (2.6 hp)
• Weight: 3.95 kg (8.7 lb), dry without bar and chain
• Bar length: 14–16 in. (35–40 cm)

This modern 40.2 cc 640 is unrelated to the 67 cc 640 family. Fleurelle’s KSB 2640 was a non-Solo-badged derivative.

Solo 633 top-handle

• Production years: 1999–circa 2007
• Displacement: 36.2 cc (2.2 cu. in.)
• Power: 1.5 kW (2.0 hp)
• Weight: 3.4 kg (7.5 lb), dry without bar and chain
• Bar length: 12 in. (30 cm) standard

The 633 was Solo’s smaller arborist-pattern top-handle saw. Its handle arrangement makes it easy to distinguish from the rear-handle 630 even though the engines are closely related.

Solo 637 top-handle, modern generation

• Production years: Circa 2004–at least 2008; revised parts are documented from 2006
• Displacement: 40.2 cc (2.5 cu. in.)
• Power: 1.9 kW (2.5 hp)
• Weight: 3.5 kg (7.7 lb), dry without bar and chain
• Bar length: 14 in. (35 cm) standard

This arborist saw has no relationship to the 1960s 637 attachment for the Combi 250. Solo’s parts archive identifies an updated 637 execution from 2006.

Late Solo gasoline models, 2000 to the AL-KO transition

The last Solo-developed range included several mid-life chassis revisions. Models that remained on sale after the 2014 acquisition are shown once with a continuous date line, rather than duplicated under solo by AL-KO.

Solo 635 ECO

• Production years: Circa 2000–at least 2008
• Displacement: 36.3 cc (2.2 cu. in.)
• Power: 1.4 kW (1.9 hp)
• Weight: 4.2 kg (9.3 lb), dry without bar and chain
• Bar length: 12–16 in. (30–40 cm)

The ECO name belongs to this 36.3 cc platform, not the 92 cc first-generation 635. An older 3.9 kg secondary figure is superseded by the 4.2 kg figure in the later Solo family manual.

Modern Solo 636 and Solo 636 Deko

• Production years: Circa 1999–at least 2014
• Displacement: 36.3 cc (2.2 cu. in.)
• Power: 1.5 kW (2.0 hp)
• Weight: 4.2 kg (9.3 lb), dry without bar and chain
• Bar length: 12–16 in. (30–40 cm)

Deko identifies the decompression-valve version. This generation continued into the solo by AL-KO transition and is unrelated to the 106 cc Australian 636 of the late 1960s.

Modern Solo 642

• Production years: Circa 2000–at least 2008; a revised execution is documented from 2007
• Displacement: 40.2 cc (2.5 cu. in.)
• Power: 1.8 kW (2.4 hp)
• Weight: 4.1 kg (9.0 lb), dry without bar and chain
• Bar length: 12–16 in. (30–40 cm)

This 40.2 cc saw reused a badge last seen on the 106 cc 635 Super platform. The 2007 parts revision did not change the headline displacement, output, or manual weight enough to justify a separate specification entry.

Solo 643 and Solo 643 Deko

• Production years: Circa 2004–2008
• Displacement: 40.2 cc (2.5 cu. in.)
• Power: 2.0 kW (2.7 hp)
• Weight: 4.1 kg (9.0 lb), dry without bar and chain
• Bar length: 13–15 in. (33–38 cm)

The Deko suffix marks the decompression-equipped version. Solo replaced this model in the range with the 643 IP while keeping the same core displacement and rated output.

Solo 643 IP

• Production years: 2008–at least 2014
• Displacement: 40.2 cc (2.5 cu. in.)
• Power: 2.0 kW (2.7 hp)
• Weight: 4.1 kg (9.0 lb), dry without bar and chain
• Bar length: 13–15 in. (33–38 cm)

The IP revision replaced the 643 and remained among the legacy Solo saws sold during the early AL-KO period.

Solo 646

• Production years: 2008–at least 2014
• Displacement: 45 cc (2.7 cu. in.)
• Power: 2.2 kW (3.0 hp)
• Weight: 4.7 kg (10.4 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

Solo 652

• Production years: 2008–at least 2014
• Displacement: 52 cc (3.2 cu. in.)
• Power: 2.4 kW (3.2 hp)
• Weight: 4.7 kg (10.4 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

The 646 and 652 shared a chassis and listed weight, with the model number closely reflecting their respective displacement classes.

Round-chassis Solo 644

• Production years: August 2006–2012
• Displacement: 45 cc (2.7 cu. in.)
• Power: 2.6 kW (3.5 hp)
• Weight: 5.2 kg (11.5 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

Solo’s dated parts material calls this the new round execution. Its 32.6 mm stroke and 5.2 kg dry weight separate it from the lighter 44.3 cc square-chassis 644.

Round-chassis Solo 651 SP

• Production years: August 2006–2012
• Displacement: 51 cc (3.1 cu. in.)
• Power: 2.7 kW (3.6 hp)
• Weight: 5.2 kg (11.5 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

Round-chassis Solo 651 and Solo 651 H

• Production years: August 2006–2012
• Displacement: 51 cc (3.1 cu. in.)
• Power: 2.9 kW (3.9 hp)
• Weight: 5.2 kg (11.5 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

The H suffix added heated handles. Both round 651 versions are heavier and have slightly different nominal displacement from the 50.8 cc square-body generation.

Solo 656 SP

• Production years: 2007–2012
• Displacement: 56 cc (3.4 cu. in.)
• Power: 2.8 kW (3.8 hp)
• Weight: 5.3 kg (11.7 lb), dry without bar and chain
• Bar length: 13–18 in. (33–46 cm)

The SP version kept the 56 cc engine but used a lower output rating than the regular 656.

Solo 656 and Solo 656 H

• Production years: 2007–at least 2014
• Displacement: 56 cc (3.4 cu. in.)
• Power: 3.2 kW (4.3 hp)
• Weight: 5.3 kg (11.7 lb), dry without bar and chain
• Bar length: 13–20 in. (33–50 cm), depending on .325 in. or 3/8 in. cutting equipment

The H suffix added heated handles. The regular 656 survived into the early solo by AL-KO carryover range.

Solo 651 C

• Production years: 2013–at least 2014
• Displacement: 51 cc (3.1 cu. in.)
• Power: 2.6 kW (3.5 hp)
• Weight: 5.45 kg (12.0 lb), manufacturer figure without cutting equipment
• Bar length: 13–18 in. (33–46 cm)

The C series arrived as emissions rules tightened and used a catalytic exhaust system. A 2013 independent test records a 48 cm maximum cutting length, consistent with the 46 cm factory bar class after rounding conventions.

Solo 656 C

• Production years: 2013–at least 2014
• Displacement: 56 cc (3.4 cu. in.)
• Power: 2.8 kW (3.8 hp)
• Weight: 5.4 kg (11.9 lb), dry without bar and chain
• Bar length: 13–20 in. (33–50 cm), depending on cutting setup

The 656 C paired the larger 56 cc engine with the C-series emissions package and a lower output rating than the earlier non-catalyst 656.

Solo 665 and Solo 665 H

• Production years: 2007–at least 2014
• Displacement: 65.9 cc (4.0 cu. in.)
• Power: 3.6 kW (4.8 hp)
• Weight: 6.7 kg (14.8 lb), dry without bar and chain
• Bar length: 16–20 in. (40–50 cm)

The H model added heated handles. Do not confuse this 65.9 cc Solo 665 with the later 50.9 cc solo by AL-KO 6651.

Solo 675 and Solo 675 H

• Production years: 2007–at least 2014
• Displacement: 74.6 cc (4.6 cu. in.)
• Power: 4.3 kW (5.8 hp)
• Weight: 6.65 kg (14.7 lb), dry without bar and chain
• Bar length: 16–24 in. (40–60 cm)

Solo 681 and Solo 681 H

• Production years: 2007–at least 2014
• Displacement: 80.7 cc (4.9 cu. in.)
• Power: 4.7 kW (6.3 hp)
• Weight: 6.6 kg (14.6 lb), dry without bar and chain
• Bar length: 16–28 in. (40–70 cm)

The 681 was the largest of Solo’s final in-house 665/675/681 family. Heated-handle H versions of all three are documented in the manufacturer manual.

Solo 694

• Production years: 2001–2012
• Displacement: 90 cc (5.5 cu. in.)
• Power: 4.9 kW (6.6 hp)
• Weight: 8.2 kg (18.1 lb), dry without bar and chain
• Bar length: 20–32 in. (50–80 cm), with the available range depending on 3/8 in. or .404 in. chain

The 694 came from Solo’s development cooperation with Dolmar and is closely related to the Dolmar PS-9000/9010 platform. Solo’s own manual figure of 4.9 kW takes precedence over the 5.4 kW number repeated by some rescue-saw and collector pages.

Solo corded-electric chainsaws

Solo’s electric sequence was not continuous, and the same 620 number was used for both a 1970s gasoline saw and a later corded model. Dated illustrated parts lists establish the otherwise poorly documented 613 and 614, while later owner manuals supply full data for the 620 and 621.

Solo 649 electric

• Production years: 1966–unknown
• Displacement: Not applicable; electric
• Power: About 1.8 kW (2.5 PS), with a 220 V, 9.1 A supply rating; input/output basis not stated
• Weight: 9.8 kg (21.6 lb)
• Bar length: Unknown

The 649 was Solo’s first electric chainsaw and belonged visually to the 50/630/632/637 family. Its motor came from SF Scheer and had originally been designed for portable circular saws.

Solo 614 electric

• Production years: 1990–at least 1996, based on dated Solo parts-list revisions
• Displacement: Not applicable; electric
• Power: Unknown
• Weight: Unknown
• Bar length: 14–16 in. (35–40 cm) documented in cutting-equipment applications

Solo parts records survive from June 1990, September 1991, and March 1996. A 1,400 W figure appears on secondhand machines, but no period Solo specification page was found to establish the rating standard, so it is not promoted to the specification line.

Solo 613 electric

• Production years: By June 1999–unknown
• Displacement: Not applicable; electric
• Power: Unknown
• Weight: Unknown
• Bar length: 14 in. (35 cm) documented

A dated Solo illustrated parts list confirms the 613 and its 35 cm cutting equipment. Surviving application lists are plentiful, but they do not establish a defensible motor rating or weight.

Solo 620 electric

• Production years: 2004–at least 2010
• Displacement: Not applicable; electric
• Power: 2.0 kW input (about 2.7 hp equivalent), 230 V
• Weight: 4.4 kg (9.7 lb), manufacturer figure; cutting-equipment basis not stated
• Bar length: 16 in. (40 cm)

This 620 is a corded saw, not a late version of the 52 cc 620 VA. Solo’s March 2004 manual and a documented 2010 test bracket its known sales life.

Solo 621 electric

• Production years: 2012–at least 2019
• Displacement: Not applicable; electric
• Power: 2.5 kW input (about 3.4 hp equivalent), 230 V
• Weight: 4.3 kg (9.5 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 16 in. (40 cm)

The 621 appeared in Solo catalogs before the acquisition and remained in solo by AL-KO regional literature afterward, making it a documented carryover rather than an AL-KO-only saw.

Commercial Solo-powered rescue chainsaws

SureVent Equipment converted production Solo powerheads for fire and ice rescue. These were commercial third-party packages, not standard Solo factory forestry models, but they retained identifiable Solo chainsaw power units and satisfy the special-purpose portion of this inventory. SureVent’s archived rescue-saw specifications and ice-rescue saw page document the configurations.

SureVent VRS 667N and VRS 667N 12R

• Production years: Circa 1990s–unknown; now discontinued
• Displacement: 69 cc (4.2 cu. in.) Solo 667 powerhead
• Power: 3.6 kW (4.8 hp) in the Solo manual; SureVent advertised 3.9 kW (5.2 hp)
• Weight: 6.3 kg (13.8 lb) powerhead; 8.1 kg (17.8 lb) with 12 in. bar, carbide chain, and depth-control roller
• Bar length: 12, 16, or 20 in. (30, 41, or 51 cm)

The N and 12R packages added carbide cutting equipment and an adjustable roller depth gauge for ventilation cuts through roofing materials.

SureVent VRS 694 and VRS 694 12R

• Production years: After 2001–unknown; now discontinued
• Displacement: 90 cc (5.5 cu. in.) Solo 694 powerhead
• Power: 4.9 kW (6.6 hp) in the Solo 694 manual; SureVent advertised 5.4 kW (7.2 hp)
• Weight: 9.3 kg (20.6 lb) with 12 in. bar, carbide chain, and roller; SureVent’s 7.5 kg bare-powerhead claim conflicts with Solo’s 8.2 kg manual figure
• Bar length: 12, 16, or 20 in. (30, 41, or 51 cm)

The conversion-maker’s 5.4 kW and 7.5 kg bare figures match the earlier Solo 690 more closely than Solo’s 694 manual. The equipped rescue-package weight is retained, but the discrepancy should be checked against a period SureVent brochure before those bare figures are quoted without qualification.

SureVent VRS 690 Ice Rescue and VRS 690 12R

• Production years: Circa 1990s–unknown; now discontinued
• Displacement: 90 cc (5.5 cu. in.) Solo 690 powerhead
• Power: 5.4 kW (7.2 hp)
• Weight: 7.5 kg (16.6 lb) powerhead; 10.7 kg (23.6 lb) with 24 in. bar, chain, and roller
• Bar length: 24, 36, or 60 in. (61, 91, or 152 cm)

The exceptionally long bars were intended to cut access openings in ice while the roller controlled depth. SureVent also offered a shorter rescue configuration and a limbing kit around the same VRS 690 power unit.

solo by AL-KO gasoline chainsaws

AL-KO initially continued several established Solo models, then introduced new Solo-branded compact and professional saws. A dated 2019 solo by AL-KO catalog documents the early post-acquisition range, while current official pages establish which later models remained listed in August 2026.

solo by AL-KO 6238

• Production years: 2018–at least 2019
• Displacement: 37.2 cc (2.3 cu. in.)
• Power: 1.2 kW (1.6 hp)
• Weight: 4.6 kg (10.1 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 14 in. (35 cm)

The 6238 was the lighter member of AL-KO’s first new compact Solo-branded pair.

solo by AL-KO 6240

• Production years: 2018–current as of August 2026
• Displacement: 40.1 cc (2.4 cu. in.)
• Power: 1.5 kW (2.0 hp)
• Weight: 4.6 kg (10.1 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 16 in. (40 cm)

solo by AL-KO 6436

• Production years: 2018–current as of August 2026
• Displacement: 35.2 cc (2.1 cu. in.)
• Power: 1.45 kW (1.9 hp)
• Weight: 4.75 kg (10.5 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 14 in. (35 cm)

solo by AL-KO 6442

• Production years: 2018–current as of August 2026
• Displacement: 41.9 cc (2.6 cu. in.)
• Power: 1.7 kW (2.3 hp)
• Weight: 4.8 kg (10.6 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 16 in. (40 cm)

solo by AL-KO 6646

• Production years: July 2019–current as of August 2026
• Displacement: 46.5 cc (2.8 cu. in.)
• Power: 2.0 kW (2.7 hp)
• Weight: 5.6 kg (12.3 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 15–18 in. (38–45 cm), depending on market package

solo by AL-KO 6651

• Production years: Circa 2019–current as of August 2026
• Displacement: 50.9 cc (3.1 cu. in.)
• Power: 2.2 kW (3.0 hp)
• Weight: 5.6 kg (12.3 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 15–18 in. (38–45 cm), depending on market package

solo by AL-KO 6656

• Production years: July 2019–current as of August 2026
• Displacement: 55.5 cc (3.4 cu. in.)
• Power: 2.4 kW (3.2 hp)
• Weight: 5.6 kg (12.3 lb), manufacturer net figure; cutting-equipment basis not stated
• Bar length: 15–20 in. (38–50 cm), with .325 in. and 3/8 in. factory packages

solo by AL-KO battery chainsaws

Battery voltage describes the electrical system, not motor output. AL-KO does not publish a continuous motor-output figure for these models, so none is invented from voltage or chain speed.

solo by AL-KO CS 4235

• Production years: 2018–current as of August 2026
• Displacement: Not applicable; electric
• Power: Motor output not advertised; 36 V nominal PowerFlex battery system, also marketed as 42 V maximum
• Weight: 3.2 kg (7.1 lb) bare tool without the belt-mounted battery
• Bar length: 10–14 in. (25–35 cm)

Announced in 2017 for the 2018 season, the CS 4235 separates the battery from the saw with an optional belt system.

solo by AL-KO CS 3635

• Production years: 2024–current as of August 2026
• Displacement: Not applicable; electric
• Power: Motor output not advertised; 36 V battery system
• Weight: 4.2 kg (9.3 lb), manufacturer net figure; battery inclusion not stated
• Bar length: 14 in. (35 cm)

The official CS 3635 page places it in the newer Premium Pro battery generation, with a 24 m/s maximum chain speed.

solo by AL-KO CS 3640

• Production years: 2024–current as of August 2026
• Displacement: Not applicable; electric
• Power: Motor output not advertised; 36 V battery system
• Weight: 4.3 kg (9.5 lb), manufacturer net figure; battery inclusion not stated
• Bar length: 16 in. (40 cm)

What the complete Solo chronology shows

Solo’s chainsaw history is broader than its familiar red professional saws suggest. It begins with huge direct-drive machines, passes through a two-cylinder experiment and several early electric saws, then branches into compact Farmer models, arborist saws, long-running professional families, and purpose-built rescue conversions. Reused numbers are the rule rather than the exception, which is why displacement, chassis generation, and suffix matter as much as the badge.

The 2014 transfer did not end the name immediately. Legacy Solo saws crossed into the early AL-KO period, and new solo by AL-KO gasoline and battery models continued the brand into 2026. Period literature may yet resolve the handful of open dates and obscure suffixes, but the documented production line forms a continuous record from the 1958 Solo-Säge to today’s CS 36-series battery saws.