Here is what I run in my '96 ZRT800 with a roller cover. Primary clutch run Comet AC weights (58.3 grm's). Grind the tips (the very end furthest from the pivot hole) down to a weight of 57 grams, grinding at aprox. a 15 degree angle with more taken from the inside edge of the weight if you RPM's are too low. Run Arctic Cat yellow/green primary spring and a 53 degree Cat helix with the green sno-pro spring in the secondary. Try this first without grinding the weights as ever sled is a little different. Run at 8200 RPM building to 8400-8500 for top speed, should be close to the middle hole. If your shift RPM's are off try different helixs, lower angle for higher RPM higher angle for less RPM (each degree of helix changes shift RPM about 100RPM). She hauls with this set up and it doesn't effect top end or back shift. Springs are about $10 each, helix is $24 and the weights are about $35. This beats my kids RPC clutched ZRT800 every time in midrange and top end. He pulls about 2 sled lengths on me off the line and by 60mph I am by him and its over. I run an M-10 so I am sure it's my suspension's poorer traction that lets him get the whole shot on me.