Valve Adjusting Screws
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  1. #1
    Senior Member elime's Avatar
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    While doing some head work (home valve job otherwise called valve lapping) on my supposedly parts bike I looked at the adjusting screws. Given my past experience I am not surprised to find they need replacing. The ends of the valve stems look a little rough and I figured I could take a rubber wheel on a Dremel and lightly polish them unless someone knows of a good reason not to. Keep in mind this is a shoe string operation.



    The other thing is checking these adjusting screws for wear is very easy -- simply unscrew them from the rocker and take a look. Maybe even use a magnifying glass for a clearer view ( as I do ). You might want to be super careful and stuff a paper towel in the hole around the rocker arm so if you drop the screw it doesn't fall into the engine. You can't be to careful!



    The ends of the adjusting screws. Not real bad but bad enough to justify replacing.











    The ends of the valve stems. Again, a light polishing with a rubber wheel to smooth out any rough edges. Any one think that is a bad idea please say so.







    Long live the internal combustion engine!

  2. #2
    Senior Member ronnydog's Avatar
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    Regrind them flat to match.



    Ronnydog

  3. #3
    Senior Member Tirebiter's Avatar
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    Grinding through the case hardening would be my only concern. I guess it wouldn't hurt to try.

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  5. #4
    Senior Member elime's Avatar
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    Quote Originally Posted by ronnydog View Post
    Regrind them flat to match.


    I took some emery paper on a sheet of glass and worked on the ends. I don't trust myself with a grinder unless it is the correct grinder designed to resurface valve stems.
    Long live the internal combustion engine!

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