The kart is a homemade one. Built for racing on some small local tracks. Just for fun. But bragging rights are always great. The engine is a yellow 6.5 clone with billet flywheel, rod, bsp3 cam and 26lb springs.i have no way of telling but supposibly it suppose to turn close to 7000 rpm. Rear tires are 11 inches tall. Its a live axle kart. 60 tooth sprocket, and curently a 15 tooth clutch. Seems really doggy of the line. But goes once its goin. Iwould guess the kart weights maybe 120 lbs. Kinda heavy i no. I would like it to be a little more snappy of the line and wondered if a smaller tooth more expensive clutch was worththr money. I d8nt have alot of room for a bigger sprocket. But could maybe fit a 72 or something. Input is much appreciated. Thanks