So I just bought a kart with a new clone 6.5 harbor freight greyhound so i will use it to practice. It does have ARC components all over it. I'm in NorCal so I'm going to drive at Blue Max and Prairie City. They both have a senior box stock class using WKA rules. I've been reading about all of these different motor builders on here. When I buy a new motor can I just use a box stock project motor from there website. I was thinking of buying the one that is 150 and putting an aluminum flywheel it. Are there really huge differences between these motors?