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Old June 10th, 2019, 06:15 PM   #78
59096
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Name: Garry
Location: Bungendore Australia
Join Date: Jan 2019

Motorcycle(s): GPX250 1989 model and 1990 model

Posts: 98
Quote:
Originally Posted by Buzzerd View Post
Taking material off of the rocker arm would still leave the adjustment close to maxed out. I might look at shaving a few thousandths of the end of the valve stem if it looks like it might become an issue. The gap is tight now so it may only a matter of time before the valve doesn't fully close. Of course I would rather fix it correctly by replacing the valve and maybe freshen things up a bit while it is apart.
Taking a small amount off the underside of the rocker arm to allow the ball to move up slightly is the least obtrusive solution. The place where material is removed in this case is not subject to friction or wear and should provide an effective solution. My second choice would be to reprofile the ball but this will probably cause a loss of hardening on the ball bearing surface which may lead to added wear on the ball - with any luck this could compensate for the ongoing valve seat recession?
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