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Old 07-13-2014, 09:21 AM   #1
Albino Reino OP
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Stripped head bolt

I have a 91 gspd and the upper exhaust head bolt stripped. It was already helicoiled and I may use a big-sert or something to that effect when re-installing the head bolt.

My big question is the oil port. In the head bolt hole there are two holes deep in the back of the cavity, about 3cm. What do they do? What considerations do I have to watch out for in regards two these?

I don't want my bike to explode because I installed a head bolt wrong.

AR
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Old 07-13-2014, 02:07 PM   #2
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I'm assuming you mean the cylinder studs, the ones into the engine case?

Those oil passages need to remain clear of any obstruction as they provide oil to the top end.
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ozmoses screwed with this post 07-13-2014 at 02:16 PM
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Old 07-13-2014, 02:27 PM   #3
Hennepinboy
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I have good success repair pull cylinder studs using the HPD jig. Even with Heli Coils having been installed there is still enough metal left to drill and tap for the HPD insert. The bushing makes it easy to drill for the oil passage.

http://hpd-online.com/stud-tool.php

Be sure to never toque you head nuts to over 24 ft lbs.
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Old 07-13-2014, 03:01 PM   #4
ericrat
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Good pictures and discussion here:http://www.advrider.com/forums/showthread.php?t=745116
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Old 07-13-2014, 05:49 PM   #5
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Quote:
Originally Posted by ericrat View Post
Thanks, that answered my questions.
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