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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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<blockquote data-quote="timetraveller" data-source="post: 97658" data-attributes="member: 456"><p>Sometimes with a problem it pays to walk away and sleep on it. You write that you can 'lift' the valve spring 3/8". Thinking about that and it seems to me that Greg was probably quickest to the problem. Even if the top guide had collapsed then the spring would still be supported at its lower end on the cylinder head casting. If the valve had stretched or the valve seat pulled through then the valve spring cover would be marked seriously. I've had a bike with the lower valve guide having disappeared totally and yet I did not hear or see any change until I took the bike apart for another reason. If you can lift the spring can you rotate it? If so then you might be able to see that both springs have turned into odd bits of steel. Either spring on its own exerts enough pressure to stop you moving things easily by hand. Good luck with it and let us know what you find.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 97658, member: 456"] Sometimes with a problem it pays to walk away and sleep on it. You write that you can 'lift' the valve spring 3/8". Thinking about that and it seems to me that Greg was probably quickest to the problem. Even if the top guide had collapsed then the spring would still be supported at its lower end on the cylinder head casting. If the valve had stretched or the valve seat pulled through then the valve spring cover would be marked seriously. I've had a bike with the lower valve guide having disappeared totally and yet I did not hear or see any change until I took the bike apart for another reason. If you can lift the spring can you rotate it? If so then you might be able to see that both springs have turned into odd bits of steel. Either spring on its own exerts enough pressure to stop you moving things easily by hand. Good luck with it and let us know what you find. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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