The original Tecumseh Pro Sport finally locked up on me but found out that Harbor Freight sells a 212cc “Predator” engine that is supposedly a good fit for the this particular go kart. It was a fairly easy swap out however, I’ve realized the crankshaft on this new engine is much shorter than the original engine. Was hoping though shorter it would still work but first run with my son the clutch came flying off once he really mashed on the gas. There just isn’t enough meat on the crankshaft to give the clutch enough to hang onto. I have found a Tecumseh crankshaft for sale at bmikarts. It looks very similar to the predator crankshaft but doubt it could work in the predator engine. Anyone have any ideas.?