Here's something we can start..
1) stock pulse line rubbing against the rear carb, between my friends and I theres 3 SXR's and all 3 are rubbing. put a shield on the pulse before it rubs a hole .
2) check for air leaks at the mating surface of the crank case. Mine was leaking. rub you fingers...
I have a few of those cracks too but I think mine is from carving hi speed G turns and the bondrail acts like a cup plus my bumper revits are all loose from the turns also. gonna remove them and install aftermarkets one this winter.
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