Jonsereds 621. The all-round saw … sturdy and dependable!
The Jonsereds 621 is a chain saw of proven construction. Its features have been steadily improved over the years to meet the growing demands on efficiency and economy. Modern logging methods have influenced chain saw design; such as limbing skids and a completely smooth and rounded lower surface. The Jonsereds 621 has been designed for fast, easy and safe limbing, and for felling trees large and small. Like all the other Jonsereds chain saws, the 621 is fitted with a range of safety features.
Specifications:
- Weight with 12” bar . . . 16 1/4 lb (7.4 kg)
- Engine displacement . . . 3.4 cu in (56 cc)
- Chain speed . . . 3900 ft/min (20 m/sec)
- Fuel capacity . . . 2 pints (1 liter)
- Oil tank capacity . . . 3/4 pint (0.4 liter)
- Bar lengths . . . 12, 13, 15, 16 or 19 inch
Anti-vibrated with rubber mounts (oil and heat resistant) in both handles. Spring-loaded kick-back guard. Spark plug protector. Safetycatch for throttle control. Automatic chain lubrication with adjustable oil feed.
- Kick-back guard of toughened plastic.
- Large fuel tank.
- Separate anti-vibration of rear handle.
- Sighting line arrow with safe-felling diagrams.
- Separate anti-vibration of front handle.
- Safety catch against accidental throttle opening.
- Safety guard for the right hand.
A few comments from our FB post on the 621:
- Wesley said, “Those were some good saws. Maybe a little slower than the stuff made nowadays but they were made well and were a real tool.”
- David said, “One of the best 👌”
- Timothy said, “A lot of them in Maine. Had to hold the rope up when shutting off, had a bad habit of breaking rope at the grip.”
- And Mike responded, “I could deal with that it was the occasional breaking of the cylinder base that was a helluva a lot more devastating. But all in all a good rugged tough saw that was very fixable when it broke….and they did like most saws back in the day… but parts and support from Tilton Equipment back then made it easy…”
In an earlier post, Bob shared, “Most of the Jonsered saws of that day were about as bulletproof as things can get. I’ve seen more than one sit for months. And start and run with absolutely zero storage maintenance. The only problem I remember was the super tiny on & off switch. pretty fragile.”
| Feature | Specification |
|---|---|
| Manufactured by | Jonsereds Fabrikers AB, Partille, Sweden |
| Series or assembly number | XN 621 |
| Years made | 1970 – 1982 |
| Engine displacement | 56 cc (3.4 cu. in.) |
| Cylinder bore | 45 mm (1.77 in.) |
| Piston stroke | 35 mm (1.378 in.) |
| Cylinder type | Aluminum with Nikasil coated bore |
| Intake method | Piston ported |
| Horsepower | 2.65 kW @ 7700 rpm |
| Weight | 6.3 kg (14 lbs.) powerhead only |
| Operator configuration | One man operation |
| Handlebar system | Anti-vibration |
| Chain brake | None |
| Clutch | Centrifugal |
| Drive type | Direct |
| Construction | Die cast magnesium |
| Magneto type | Pagani |
| Carburetor | Tillotson HS-21D series |
| Major repair kit | RK-23HS |
| Minor repair kit | DG5-HS/T |
| Air filter system | Nylon mesh cylinder |
| Starter type | Jonsereds automatic rewind |
| Oil pump | Automatic, worm gear driven |
| Maximum engine RPM | 10,300 |
| Idle RPM | 2,900 |
| Ignition timing | 2.7 mm before TDC |
| Breaker point setting | 0.3 to 0.4 mm |
| Flywheel/coil air gap | 0.30 mm (0.012 in.) |
| Spark plug type | Champion CJ7Y |
| Spark plug gap | 0.5 to 0.6 mm (0.020 to 0.024 in.) |
| Crankshaft main bearings | Ball |
| Fuel tank capacity | 1 litre |
| Fuel oil ratio | 25:1 |
| Recommended fuel octane | Regular |
| Mix oil specification | Two-cycle chain saw mix oil |
| Chain pitch | 3/8 in. |
| Chain type | Chisel |
| Bar mount pattern | 18 link |
| Shortest guide bar supplied | 33 cm (13 in.) |
| Longest guide bar supplied | 58 cm (23 in.) |
| Colour scheme | Red and silver enamel |
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