Primary Clutch Issue

[yamaha06]

So I’m on a saddle bag trip for the last ride of the season. I pulled into the gas station and noticed this copper looking dust on my running boards and coming out of seams in the plastic. I pulled my side cover off and that copper dust is everywhere. I’ll post some pics, has anyone ever see anything like this? I’m almost wondering if the bushing in the thunder products 911 cover isn’t shot. I babied the sled back to the hotel but I’m 400km away from my truck.

 

[KnappAttack]

Sure looks like ground up brass to me.

I'd guess its that cover bushing too, but why? Rollers in good shape? I'd guess the whole clutch is going to need a rebuild now or replaced.

I've never understood the reason for swapping out the stock Yamaha cover, its not like the factory one is weak or breaking.

 

[jonlafon1]

No way that bushing failed unless something else is going on.

 

[yamaha06]

Looked at it last night and the clutch cover bushing is toast, has a lot of play. Got the sled floated back to the truck, now for the 10 hour drive home. Will post updates of the damage when I tear the clutch apart. I’m wondering if the sheave bushing didn’t to for a sh!t and end up causing this cover bushing failure. Rollers and everything else seem to be good still so not sure what ended up causing this. But that’s it for my season. 9400km on the sled and first time she’s ever let me down.

 

[KnappAttack]

Looked at it last night and the clutch cover bushing is toast, has a lot of play. Got the sled floated back to the truck, now for the 10 hour drive home. Will post updates of the damage when I tear the clutch apart. I’m wondering if the sheave bushing didn’t to for a sh!t and end up causing this cover bushing failure. Rollers and everything else seem to be good still so not sure what ended up causing this. But that’s it for my season. 9400km on the sled and first time she’s ever let me down.

Thats a shame, sorry to hear.
Haven't heard of the sliding sheave bushings wearing out or failing on Yamaha primaries much if ever. I'd say thats doubtful, but if it is the aftermarket cover may have caused the premature failure. I personally wouldn't be swapping the Yamaha cover out. IMO that aftermarket cover does nothing to strengthen the Yamaha clutch in anyway whatsoever, take it off and go back to the stock cover with the factory bushing that slides on the factory melanite coated shaft.

I don't doubt you will need to rebuild the clutch with inner bushing and all the buttons too with that bushing failing that fast and that bad. It is a ton of debris in that clutch compartment!

 

[cannondale27]

Thats a shame, sorry to hear.
Haven't heard of the sliding sheave bushings wearing out or failing on Yamaha primaries much if ever. I'd say thats doubtful, but if it is the aftermarket cover may have caused the premature failure. I personally wouldn't be swapping the Yamaha cover out. IMO that aftermarket cover does nothing to strengthen the Yamaha clutch in anyway whatsoever, take it off and go back to the stock cover with the factory bushing that slides on the factory melanite coated shaft.

I don't doubt you will need to rebuild the clutch with inner bushing and all the buttons too with that bushing failing that fast and that bad. It is a ton of debris in that clutch compartment!

Lets not be so quick to blame the cover bushing. Thats a huge bushing. Something is not making sense here. Many of us use 911 cover for adjustment. Not just for strength. Let them figure out what happened.

 

[actionjack]

Ever take the cover off with the clutch bolt in place? Maybe marred up the bushing that way.

 

[yamaha06]

Ever take the cover off with the clutch bolt in place? Maybe marred up the bushing that way.

No never have. On this cover there is like a cup that fits inside the bushing and the bolt fits in the cup.

 

[Thunder Products]

Looked at it last night and the clutch cover bushing is toast, has a lot of play. Got the sled floated back to the truck, now for the 10 hour drive home. Will post updates of the damage when I tear the clutch apart. I’m wondering if the sheave bushing didn’t to for a sh!t and end up causing this cover bushing failure. Rollers and everything else seem to be good still so not sure what ended up causing this. But that’s it for my season. 9400km on the sled and first time she’s ever let me down.

yamaha06 - Thank you for messaging me right away on this when it happened and great chatting with you. We at Thunder Products Clutching are proud of our products, have numerous 911 covers out there with well over 10,000 miles and still fit like new. As mentioned, our repair facility wants this whole primary clutch to dissect and figure out why the cover bushing is the way it is. Definitely the 1st one we have heard with this issue.

Lets not be so quick to blame the cover bushing. That's a huge bushing. Something is not making sense here. Many of us use 911 cover for adjustment. Not just for strength. Let them figure out what happened.

Thank you Cannondale27

No way that bushing failed unless something else is going on.

We are thinking spider buttons went first, putting more pressure on the bushing and sleeve when sliding in and out.

IMO that aftermarket cover does nothing to strengthen the Yamaha clutch in anyway whatsoever, take it off and go back to the stock cover with the factory bushing that slides on the factory melanite coated shaft.

Everything is noted here in the SnowTech Magazine article on what is gained, strengthened and how it makes the primary clutch work better.

 

[Rich Kay]

10k on my 911 cover …. no issues what so ever. My two cents... something else caused it like movable sheave bushing and or spider got sloppy.

 

[Byam]

yamaha06 - Thank you for messaging me right away on this when it happened and great chatting with you. We at Thunder Products Clutching are proud of our products, have numerous 911 covers out there with well over 10,000 miles and still fit like new. As mentioned, our repair facility wants this whole primary clutch to dissect and figure out why the cover bushing is the way it is. Definitely the 1st one we have heard with this issue.



Thank you Cannondale27



We are thinking spider buttons went first, putting more pressure on the bushing and sleeve when sliding in and out.



Everything is noted here in the SnowTech Magazine article on what is gained, strengthened and how it makes the primary clutch work better.

In the race for customer satisfaction, there is NO finish line!


Stand up company

 

[Mitch Desorcy]

Why not try the old primary?? It seemed less trouble free with plenty to turbo and super charged sleds.

 

[Mitch Desorcy]

I found if you kept them clean and rebuilt them after a couple of seasons they always help up.

 

[Mitch Desorcy]

I run the 911 cover and have for many years. Before I do final installation I put the sub shaft on without the primary spring then place the cover on. There is a sweet spot where you place the cover. I felt it bind a little based on where you turn the cover. And make sure the stud shaft is securely tapped to the primary.

 

[Mitch Desorcy]

This is based on the old, or previous primary.