Craftsman push mower

[mikehouse]

My Craftsman walk behind has been tuned up pretty good.New oil,filter,spark plug,rebuilt carb,fresh gas.I notice when it runs the muffler will sputter at times.Dont understand why.

 

[ILENGINE]

Could be several things you can't really do anything about. Most likely it is plug misfire. I read a few years ago where champion claimed a 25% misfire was acceptable. Fuel quality could cause a misfire, and it may not be bad gas, just today's junk gas.

 

[mikehouse]

Thanks for that info.I thougt maybe I had put something on wrong or not at all,lolol