I have a 1991 Polaris Indy 650, Model # 0910758, serial # 1840650 Mfg Date #0061990. The guy I got the sled from had ideas of turning it into a drag sled and to me the clutch has never worked right. I believe the primary was switched at some point and is not the correct for the sled. I have tried the recommended belt and it as to much slack in it. The clutch engages at about 4500 rpm with Polaris Belt #3211042. Riding today in very light fluffy snow I had to be easy on the throttle in order to engage the belt, could not go from half throttle to wide open as engine rpm would get to 5,000 and stop increasing, about 20-30 mph on the speedo. In the picture for the Polaris part book I labeled the parts with what numbers I have on my clutch. Sliding sheeve 480 092889. Any help on identifying the clutch and any other suggestions are appreciated.