why does the key in the crank of my kawasaki x2 keep breaking?

Kdawg

New member
I have a stock kawasaki x2 with a 650. The key has snapped in half 3 times, every time my brother opens the crank replaces the key and puts thread lock on the bolt. He says the bolt keeps coming loose causing the key to snap. we're going to replace the key again and tighten the bolt with an impact gun but what should i do if that doesn't work?
i haven't used an impact gun yet. we've been tightening it by hand, from what i read online it said to use an impact gun
 
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