Maintenance & Technical > KX500 Original

Stud pulled out during top end replacement

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Jes_KX5:
I recently replaced the top end. When putting the cylinder back in, I noticed that one of the four studs felt weird when I was putting the nut on it. I rode anyway  and later noticed that it was leaking at the base gasket. I went to tighten the nut and the stud pulled out of the crank case.

How should I go about fixing this problem? I am thinking tapping the crank case hole to M12. Then spinning an M12 bolt on a lathe so that I can cut the upper part of it with an M10 die. This would save me the trouble of drilling the stud hole in the cylinder to 12mm. I would appreciate any other suggestions. Thanks.

KXcam22:
Jes,
  Your are lucky (or observant) that you noiced it right away. Your way would work but an M10 helicoil might be the easiest fix.  Cam.

5dracing:
Jes,

I used to race offroad in the buggies. I've fixed a similar problem on an air cooled VW head. A VW shop that carries aftermarket parts may have the exact bolt you want to make. I'm not sure if the length would be correct, but it might be worth checking. Teh stud I replaced was the exhaust bolt.

Jes_KX5:
Thanks for the info.

Cam, where could I buy or order a Helicoil that I could have by this weekend?

hughes:
Try your local auto parts stores for the heli-coils.

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