Crack In Muffler
I went over to a friends house to look at his lawn tractor that he said was running rough. It seemed to run and cut grass but had a fairly frequent popping sound or miss, tough to say what.
I ran a high concentration of seafoam (20% v/v in gas) to see if it might clean out the carburetor but it didn't get rid of it. I didn't have the time to take the carb apart and give it a good cleaning but I noticed that his muffler was very rusted and had a crack in the pipe that comes out from the motor to wind around underneath. You could see a little smoke coming out the crack.
I was wondering if that might have anything to do with its running condition. I am not sure if these mufflers are finely tuned or if you could run a motor fine without one. Any thoughts on this would be appreciated.
Motor is a B&S 12.5HP bought in 1999. Model 289707 L-head on a Weedeater lawn tractor.