Mower runs but has small backfires when accelerator moves up.
Craftsman 917.289220 Mower runs but has small backfires as throttle is moved up. Also loses power as this happens.
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A spark plug that is damaged, worn, or has an improperly set gap between its electrodes creates a weak spark. As a result, the fuel may not ignite in the cylinder, but it might ignite when it reaches the hot exhaust muffler. The result is a loud backfire. Poor spark also results in a mower that runs unreliably.
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Changed plug. Same result. The plug I took out was black with carbon, I guess.
Your plug sounds like it is getting to much gas. Here's how to read a plug:
It is dry fouling according to the pic. How do I remedy this?
3 Comments
Forgot to mention, air filter is clean, oil ok, fuel flows freely through filter.
by Brian clark
@bvilleeer sounds more like a carb issue than an ignition issue. What make and model is your mowers engine?
by oldturkey03
Not sure oldturkey03. Briggs 21hp
by Brian clark