Seems as I get one thing straightened out another problem pops up. So here is my situation now. Starts fine and runs good for about 20 minutes running my finish mower. After that it seems to loose HP and starts to sputter. It will still run and mow decent in reverse at this point. Once. Shut off the PTO it will run and drive ok for a while before the sputtering starts with no load. Have good fuel and spark is good cold and coil is new. I observed the flywheel today and it spins fine cold, I did notice once it starts to sputter under load the flywheel turns out of balance. Once the PTO is off it turns true again. Also when the sputtering it appears that exhaust is coming back through the intake pipe.
So my question is have I lost a bearing that is causing the crank to wobble and an exhaust valve to remain open? Is it just a valve sticking? Any other ideas I may have missed?
So my question is have I lost a bearing that is causing the crank to wobble and an exhaust valve to remain open? Is it just a valve sticking? Any other ideas I may have missed?