Clutch Question

[culvert]

Why do some primary clutches come with the set screws to hold the roller pin from turning?? Does this help with bushing life?
My MtnMax DOES NOT have these set screws and I have to replace the rollers every 1000KM or less!!!!

Anybody know the mystery of why?????

 

[vmaxjohn]

I thought for a while that the twins didn't come with them, and the triples did.

If you're having roller issues, it could be a symptom of something else being worn.

 

[culvert]

this is even after a complete rebuild of the primary. New bushings and all rollers, arms replaced.

what sleds do have the set srews?

 

[vmaxjohn]

I think just the triples. Not sure why, maybe they added that after the twins went away.

Can you post a pic of your rollers?

 

[Mtnviper]

97 XTC 600 twin I had, didn't have set screws. But the holes were there drilled and taped, so I added set screws. Didn't seem to help roller bushing wear though, that thing eat roller bushings like crazy! I would agree with vmaxjohn, I've only seen set screws installed from the factory on the tripples.
You can replace just the bushing as long as the roller dosn't have a flat spot worn on it. I usually will heat/burn the bushing with a mini torch then drive it out with a socket. Put a dab of loctite on the outer surface of the new bushing and press it in the roller, using sockets and a vise. When heating the bushing, be careful not to get the roller to hot. You don't want to take the temper out of the steel roller.

 

[culvert]

funny thing is.. it is cheaper to buy them complete, roller w/bushing then just a new bushing.

thanks for the input.

 

[gild]

set screws

My 97 MM 700 had them but my 98 MSRX 700 didn't or my 01 700 SXr

 

[vmaxjohn]

Ok, that's weird! I did a set up on an '01 SXR700 that had them! Maybe Yamaha is just throwing parts together at the last minute...lol

There's a product that some folks swear by, made by Comet. You spray it on a dry clutch assembly, and let the excess fling off...Might be worth the little effort. Good luck!

BTW, I've never had to replace roller bushings on my 500, so far 4600 miles...maybe I'm just lucky or something.

 

[gild]

screws

The real funny thing was that there were set screws holding the roller tubes and no set screws for the weight tubes, but they were drilled and tapped. Havn't had any issues without the set scews though in over 10,000 Kilos.