4 Things to Check When Your Chainsaw Smokes

Check the fuel-to-oil ratio first Excessive smoke is almost always from too much oil in the mix. Dump the old fuel and mix a fresh batch at the ratio your manual specifies, usually 50:1 or 40:1.

Inspect the air filter A clogged filter makes the engine run rich, causing more smoke. Clean or replace it.

Make sure the chain brake is fully disengaged A partially engaged brake overheats the clutch and produces smoke.

Clean the muffler screen A dirty screen traps exhaust and causes smoke buildup.