One-way sprag starting clutch.. and fricton clutch

[jasonp]

Pulling the fourwheeler in to the shed sunday night it dies as I'm bring it in... I let the clutch out to quick. Makes a huge clunk noise and then I go to start it.. Starter making some terrible noises. I'm sure it's the one way clutch that is just about out. I'm having more and more trouble with the friction clutches on my bike as well. The just seem to grab no matter what. It's hard going in and out of gear, reverse and forward. I'm wondering if the seperator plates are junk or some of the steels are warped. Hotter it gets the worst it shifts. I had it all apart it is all stock and everything looked great when I put HD springs in. I run yamalube for oil and I just don't get it. This is starting to get expensive. I'll have to take it all apart again.
I bought a programing kit for my dynatek and the rev limit they set it at was 8500 rpm. WTF! I can say though that this box even on the stock setting adds more power then the old cdi. It just runs better and can pull the front end up much easier then before, not clutching. I'm impressed. Just really hated the limiter. So I fixed that. I made a new rev limit of 11,000 rpm. You can figure out the correct RPM limit on engines by going by Powrolls method... RPM X Stroke MM divided by 152.4. = Piston speed in FPM. Powroll claims 4000 FPM but you could most likely get away with 4500 FPM (alot of people claim that) in short bursts it's just harder on the crank bearings and rod/piston. SO...
11,000 rpm is = 4660 FPM
10,500 rpm is = 4444 FPM
10,000 rpm is = 4232 FPM
9,500 rpm is = 4021 FPM
8,500 rpm is = 3597 FPM
I can't believe I'm reving the engine that hard because it hits the limiter with ease. So I fixed that. I think I'm a hair lean on the main and going to move up one size and see what happens after I get this bitch all fixed up. Also going to put my cam back to 0 degrees of offset as advancing the cam timing gave me more low end but I love that big mid hit so I'm going to go back to that. Anyway that's my rant.

 

[dave76]

Top ending close to 80 with RPM.

 

[jasonp]

Took it all appart yesterday.. found both the one way clutch sprag clutch the fingers to be worn bad and also the gear hub to have deep scratches. Awesome haha. So have to get all new **** for that. I think I will just get new thrust washer and needle bearings as well.
I pulled the clutch appart and I found nothing wrong with the frictions or steels.. look almost new with eh steels still having the oil pattern in them. The seperators I found to be maybe a little week as they don't really seems to be holding the clutches appart and when I had the springs off the clutch pack was stuck together and I really had to push them appart. I seen to that the clutch hub had deep grooves from the seperators.. but the steels still moved pretty freely on the hub, so I filed the hub down and will get some new seperators and move them to a new location on the hub and see if that helps.
Big ride coming up so hopefully I can get this thing together. Reprogramed the Dynatek to 11,000 rpm limit, jetted up one on the main so will see how it runs.