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FJR Motorcycle Forums
FAQs and Common Historical Info
Valve Checks vs. Adjustment Required Poll
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<blockquote data-quote="jpcfjr" data-source="post: 889169" data-attributes="member: 18946"><p>The factory shim was 181 and I had to go up one size to 185. So the gap was too large meaning the valve was not opening up enough...breathing is good! To get a little more technical on your buttocks... 0.010" (.254mm) slid in easily but 0.011 (.279mm) would not so I was just outside the top of the spec which is 0.0098" (.25mm). According to my calculations, dropping the clearance down by .04mm (181 to 185) would do the trick...and it did.</p><p></p><p>Edit: Thank you Jackass Yamaha engineers. You could have just as easily manufactured the groove for the gasket IN THE HEAD INSTEAD OF THE COVER! Don't you think that would have been a LITTLE easier for us part time mechanics????</p></blockquote><p></p>
[QUOTE="jpcfjr, post: 889169, member: 18946"] The factory shim was 181 and I had to go up one size to 185. So the gap was too large meaning the valve was not opening up enough...breathing is good! To get a little more technical on your buttocks... 0.010" (.254mm) slid in easily but 0.011 (.279mm) would not so I was just outside the top of the spec which is 0.0098" (.25mm). According to my calculations, dropping the clearance down by .04mm (181 to 185) would do the trick...and it did. Edit: Thank you Jackass Yamaha engineers. You could have just as easily manufactured the groove for the gasket IN THE HEAD INSTEAD OF THE COVER! Don't you think that would have been a LITTLE easier for us part time mechanics???? [/QUOTE]
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FJR Motorcycle Forums
FAQs and Common Historical Info
Valve Checks vs. Adjustment Required Poll
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