Primary clutch exploded

[74Nitro]

The slag is a bit ugly and concerning, but it's held together running the 300 tune. I bought a back up when i thought i saw a crack under the set screw, but after hitting it with some ScotchBrite it didn't look nearly as bad.View attachment 146586 View attachment 146587

The tiny black streak that at first glance appears to be a crack, is simply metal dust escaping. Naturally, it will leave that sort of mark as the centrifugal force sends it outward in that direction. I have many clutches here showing the same mark, but spray some brake clean on it followed by some compressed air and it is all gone.

 

[farmerschiferl]

not what I wanted on a Saturday morning ride. Looked the clutches yesterday and didn't see any issues with them. Thunder products heavy hitters weights with evo stage 3

 

[journeyman]

View attachment 146625 not what I wanted on a Saturday morning ride. Looked the clutches yesterday and didn't see any issues with them

What clutch parts were in it? On your profile notes it looks like you have one stock and one clutched with a tune...?

 

[farmerschiferl]

What clutch parts were in it? On your profile notes it looks like you have one stock and one clutched with a tune...?

Thunder products heavy hitters evo stage 3

 

[KnappAttack]

Thunder products heavy hitters evo stage 3

Did you find the ejected HH weight and is the arm broke? Is that roller bushing still good or shot?

 

[ClutchMaster]

First one I have seen with the roller still intact.

 

[farmerschiferl]

will get more pictures when i get it home and in the shop

 

[farmerschiferl]

 

[74Nitro]

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Take some pics of the end of the weight please.

 

[farmerschiferl]

 

[74Nitro]

View attachment 146645

Thanks. It appears like it comes by the roller. Was this at high speed when it happened?

 

[farmerschiferl]

Thanks. It appears like it comes by the roller. Was this at high speed when it happened?

Not really maybe 45mph less than 2000 miles as well

 

[journeyman]

I am seeing a common thread here.

 

[1nc 2000]

Looks like the bushing is worn out in the weight.
Look at the wear on the washer next to the roller.

 

[farmerschiferl]

Something could have gotten deformed when it let loose thou