Broken Bottom Gear Chaincase Bolt

[minks_698]

Thanks guys, makes me feel better.

 

[NyTrOMaNIaC]

No symptoms. From what I can tell the bolt is there to aid assembly. I don't see what's loading the bolt to cause this failure. But I suspect it's because the drive shaft is restrained on both ends from axial movement, so something has to give when the shaft flexes.
As noted, the broken section will come out easily. I drilled an 1/8" hole and tapped a square-drive screwdriver bit in, then backed the section out.

The Yamaha mechanic said the exact same thing when he was replacing mine. He believes that if there was room for something to move somewhat, that these bolts wouldn't break so often. Like you said, something's gotta give.

 

[Southern Renegade]

I had the shop change my track out and t they found the same thing and replaced it (bolt) for warranty. Seems to be an issue that will be updated someday.

 

[Southern Renegade]

I had the shop change my track out and t they found the same thing and replaced it (bolt) for warranty. Seems to be an issue that will be updated someday.

 

[mrtwostroke]

The -10 xtx got longer drive shaft at the gear side with a lockin ring inside the shaft to prevent the bolt to move out if it brake.

 

[enticeraised]

No one has come up with an explanation or a perminent fix.

The fix is the -09 drive axle and bolt (different thread length).

My 09 is broken as well

 

[enticeraised]

I can't see how it can affect anything with the bolt missing and the way its all designed (with that spring and outer bearing). I'm leaving it out.