4 Things to Know About Chainsaw Spark Plugs and Air Filters

Replace the spark plug annually or every 50 hours of run time, whichever comes first. A new plug costs a few bucks and takes five minutes.

Check the air filter every few tanks of gas. Swap it when it looks visibly grimy or clogged—don’t wait until the saw bogs down.

A dirty air filter makes the engine run lean and hot. In dry, dusty conditions, clean or replace the filter after every use.

Ignoring the spark plug leads to hard starts, misfires, and eventually a dead saw. An annual change is cheap insurance.