Hello, i was having problems with my sled a few months ago, that i thought might be causing the lack of rpm problem. Ive since fixed them (power valve cable, and restrictive air filter) but still am having the revving issue, which i am certain has to due with my clutches. The engine will rev quickly to 7500, then fall to around 6800-7000rpm, about a thousand under what it should be. The primary has a new yellow spring, and the secondary has a red spring. Is there any other combo of spring/weights i could use to get to the 8000-8100 rpm range that would really make this thing act like it should? Thanks.