If the muffler is clogged, the oil ratio is probably too rich, or the quality of oil is low, don't use marine/outboard oil either. Muffler clogging is really a thing of the past, back when oil quality was low and they used rich oil ratio's to compensate low quality of oil. With modern, higher quality oils and a mix ratio of 50:1, it seems almost impossible this would happen. Fuel left in the saw will evaporate, leaving the oil behind, same thing can happen in a fuel can too. This will make the oil ratio too rich along with gas going stale.
Cleanings options:
Take muffler off, use a torch to cook the carbon/oil to ash, or throw in a fire.
Soak in a strong solvent or carb cleaner, use pics or small screwdriver to scrape gunk out.
Then use compressed air and a blow gun for final cleaning.
This might help in starting. Prime bulb 5-7 times, pull choke lever out (don't touch throttle lever) try to start it (1-3 pulls or, 5 pulls max if real cold). If it sounds like it tried to start, stop pulling, and push the choke lever back in (don't touch throttle), now pull to start. Let engine run at fast idle for 20-30secs, hit throttle to return to idle. My homelite saws always need the choke lever pulled out and pushed back in unless the engine is hot and recently shut off.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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