HI, I have been having alot trouble with my powervalve lately, and was hoping to get some advice. Starting a while ago it was no longer opening, and I found that the parts were siezed due to carbon build up. I took everything apart, cleaned it up really good, and put it back together. It still doesn't open. It makes my bike seem extremely slow on top, and is driving me nuts. I took the plastic boot off of the actuating arm, and revved the motor to see if it did anything. Nothing happened. With the linkage not connected, the actuating arm moves very easily, and with the pipe off, I can see that the valves open properly. When I hook up the linkage, and pull out the actuating arm and let go it springs back into place like it should. My question is, what should I look for? So far the best I can come up with is to replace the spring, needle bearings, and possibly the gear on the ball bearing doohicky thing inside the clutch cover. (I also dismantled that and cleaned it too.) I'm lost, and can't think of anything else to do, or look for. Thanks for your help!