Not Ranked
Every spun bearing I have seen caused enough damage to the crank journal to REQUIRE regrinding the crank. The thumping you hear is the crank getting hammered. That means new bearings, a new balance job. You have to remove the motor to do it correctly. If it were my motor or one of my customer's motors I would pull the motor out and find the problem, before you do any more damage to it. If you could give us a more thorough desription of the symptoms, maybe we could point out a few things to check before you yank it out. It could be piston slap, insufficient deck height, the list goes on. It just depends on how comfortable you are not knowing exactly what is going on. Plastigauge is a waste of time, measure with tools, not a strip of wax.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
|