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Help! My Go Kart keeps going through bearings like nobody's business. Just pulled out my wheels today, and the found that the race has cracked in half. Any ideas as to why this is happening? Thanks

So, I'm building up an older Non-Hemi Predator 212 motor on an old frame, and have heard that the flywheels tend to explode past around 6,000 rpm. I don't want to have flywheel bits end up in my back, so if I want to push past 6,000 should I be concerned about that? Thanks.