Really don't know. Had it rebuilt recently - took it out for a run the other night - ran great for about a mile - I turn it around heading for the house and it got sluggish - coasted aways and well towed it home - thought I had blown the gasket - replaced it and I should have known better -the way it was running out - found a hole above the pan - looked like fine thread but it is a area that is hard to reach - tried a - I believe 1/4 plug- pipe - fine thread - the threads took for a-bit - didn't want to torque it much - as I didn't want to mees up the threads.