The Mono SL-246 was a late-1960s American chainsaw built by Mono Manufacturing Co. of Springfield, Missouri. It was introduced in 1968, with a 4.9 cu. in. (about 80 cc) single-cylinder engine.
Within Mono’s lineup, the SL-246 reads as the larger, later companion to the earlier SL-245, which had appeared in 1966 with a smaller 4.3 cu. in. (70 cc) engine. The SL-246 was not a radical redesign so much as a heavier-hitting version of the same basic idea: a one-man work saw built for straightforward cutting, medium-length bars, and practical field use rather than comfort or styling.
Mono SL-246 for sale
The saw pictured throughout this article is listed on eBay with seller ‘paveman56’ in April 2026, who regularly has interesting chainsaws for sale.
This saw is a great example of the Mono SL-246, even though it has been well-used and requires some TLC. It’s offered for sale for “parts or repair”.
The full eBay description:
Vintage Mono 6HP SL246 Chainsaw w 15″ Hardnose Bar For Parts or Repair 80cc
Mono Line SL246, a 4.9 ci. , 80cc saw made in the late 1960’s. Sticker says it made 6 HP.
Has spark, compression feels very good, and it sounds good turning over. What I can see of the piston/cyl through the exhaust looks good. Rear handle has a pop-riveted repair underneath, but it is solid. Recoil works as it should. Aluminum heat shield around the rear of the cylinder is broken in two places but still usable.
I couldn’t get the manual oiler to work- I dumped some dirty old oil out, you may get by with just a flush. Oiler button is missing from the lever. Both tanks need flushed but no rust is seen. Watch for rags in these tanks when you get the saw, I do this to prevent leakage of that last little bit.
If there was a throttle lock, it is missing. Bar measures about 15.5″ from the front, has good hardened tip left. Dried out Zip-Penn chain has a couple stiff links but is usable.
Selling As Is for parts or repair, no refunds or returns. I believe I’ve found everything wrong but I can’t guarantee it.
Please enlarge all photos for a close look, ask any questions.
It’s listed for sale for US $100.00.
| Spec | Mono SL-246 |
|---|---|
| Manufacturer | Mono Manufacturing Co., Springfield, Missouri, USA |
| Year introduced | 1968 |
| Model family | Mono direct-drive one-man saws (with models 48, SL-145, SL-245) |
| Engine displacement | 4.9 cu. in. (80 cc) |
| Power | 6 HP (4.5 kW) |
| Engine model/type | Power Products AH-480 (Tecumseh type 1503D) |
| Bore | 53 mm |
| Stroke | 35.8 mm |
| Cylinder construction | Aluminum block with cast-iron sleeve |
| Intake method | Reed-valve intake |
| Ignition (magneto) | Tecumseh flywheel magneto |
| Clutch | Fairbanks Morse centrifugal clutch |
| Drive type | Direct |
| Operator config. | One-man (tote-handle saw) |
| Supplied/compatible bar lengths | ~12″, 16″, 18″, 20″, 21″ |
| Chain pitch | .404″ or 3/8″ |
| Chain gauge | .050″ |
| Fuel | Regular gasoline (unleaded, ~90–94 octane) |
| Fuel-oil ratio | 3/4 pint oil to 1 US gal (≈10.6:1) |
| Oiling system | Manual chain oiler (front-mounted pump) |
| Chain brake | None (no spring-actuated brake) |
| Weight | Not documented (likely ~15–20 lbs) |
| Anti-vibration | None (rigid steel handle) |
| Crankcase material | Sand-cast magnesium |
| Typical applications | Farm, firewood, general logging |
Download the Mono SL-246 owner’s manual and parts list here.
