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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Clearance Advice
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<blockquote data-quote="Twigg" data-source="post: 1182217" data-attributes="member: 27619"><p>Worry less, ride more <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>Nuttin' causes the valve clearances to get wider. Theoretically, I guess that if they weren't fully closing, or if the end of the valve stem wore down unusually, that could happen. I guess in theory the shims could wear too, but all three of those possibilities are pretty much unheard of.</p><p></p><p>The valve clearances wear "tighter" because of valve and valve seat wear. The valves, over time, retract further into the cylinder head moving the end of the valve closer to the shim. If they are allowed to wear too tight then the valve doesn't fully close. This is a particular problem with the exhaust valves as the hot gasses can begin to leak through a seat that should be shut, causing a burning of the valve or seat and a whole world of hurt.</p></blockquote><p></p>
[QUOTE="Twigg, post: 1182217, member: 27619"] Worry less, ride more :) Nuttin' causes the valve clearances to get wider. Theoretically, I guess that if they weren't fully closing, or if the end of the valve stem wore down unusually, that could happen. I guess in theory the shims could wear too, but all three of those possibilities are pretty much unheard of. The valve clearances wear "tighter" because of valve and valve seat wear. The valves, over time, retract further into the cylinder head moving the end of the valve closer to the shim. If they are allowed to wear too tight then the valve doesn't fully close. This is a particular problem with the exhaust valves as the hot gasses can begin to leak through a seat that should be shut, causing a burning of the valve or seat and a whole world of hurt. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Clearance Advice
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