Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello Bob. Thank you for choosing Just Answer. My name is***** you checked your valve guides, breather assembly, and the oil ring on your dipstick. If there is a leak in crankcase vacuum, or excessive crankcase pressure, your engine will smoke.
The best to check for a cause, is by doing a Leak Down Test. This test will help to pinpoint our problem. This test will also reveal if your rings, or head gasket is at fault.
I would also check your cylinder head for warpage, just in case.
You and I can continue from here. Thanks!
Keep in mind, that if your rings are ok, you will need to focus on either excessive crankcase pressure, or a vacuum leak.