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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Theory 101
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<blockquote data-quote="ionbeam" data-source="post: 1307409" data-attributes="member: 277"><p>When the valve no longer has any gap you are at the critical tipping point. Once there is *any* wear after the zero gap point the valve won't fully close letting burning combustion gas leak around the valve flute and that's going to be the end of the valve very quickly. One tip-off the exhaust valve clearance is getting very tight is improved high rpm performance <img src="https://www.fjrforum.com/forum//public/style_emoticons/default/unsure.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> because the exhaust valve is open longer with higher lift. Hopefully there is enough valve/piston clearance that the early opening, high lift valve won't kiss the piston.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 1307409, member: 277"] When the valve no longer has any gap you are at the critical tipping point. Once there is *any* wear after the zero gap point the valve won't fully close letting burning combustion gas leak around the valve flute and that's going to be the end of the valve very quickly. One tip-off the exhaust valve clearance is getting very tight is improved high rpm performance [IMG]https://www.fjrforum.com/forum//public/style_emoticons/default/unsure.png[/IMG] because the exhaust valve is open longer with higher lift. Hopefully there is enough valve/piston clearance that the early opening, high lift valve won't kiss the piston. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Theory 101
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