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Old 03-31-2010, 07:58 PM   #1
ralph7
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mystery bolt

there is a bolt on my 2000 xr100 that is located on the right side of the head behind the spark plug and slightly above it.
what is it's function?
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Old 03-31-2010, 08:51 PM   #2
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I wasn't gonna comment but no one else has yet. Have a pic?

See if bike bandit shows it on the diagrams.
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Old 03-31-2010, 09:22 PM   #3
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If it is just threaded in, about 10mm long with a copper washer, it's to check and
verify oil flow to the head. With the motor running, pulling it out you should get a slow "dribble" out of the hole.

The oil pump doesn't develop any real pressure so flow from the hole is fine.
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Old 03-31-2010, 10:01 PM   #4
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might be the upper cam chain guide retainer

EDIT: the chain is on the other side on those motors. I think Cedestech is right on this one
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Last edited by Squanto84; 03-31-2010 at 10:04 PM.
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Old 04-01-2010, 12:10 AM   #5
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Yep, the left side has the all too often neglected cam chain tensioner locking thingy. Don't let that one come undone or its jumped timing and new valve time. been there, done that. UUUGGHHH
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Old 04-01-2010, 09:52 AM   #6
ralph7
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oil flow check

that was all i could think it might be for, since it dead ends into one of the head stud's area.

thanx for the heads up!
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Old 04-01-2010, 10:11 AM   #7
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