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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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<blockquote data-quote="Nigel Spaxman" data-source="post: 97728" data-attributes="member: 2907"><p>Quite a few people in BC have found that the upper valve guide corrodes from condensation and from acid by products of combustion. Robert Watson told me about this problem. Perhaps in really hot dry climates this would not be a problem. The corrosion is in the form of a black alumium oxide paste. That stuff wears the valve stem. I fitted iron bushings into my upper valve guides to prevent this problem. I used some sintered bushings from McMaster Carr. Some other people have used bronze. In either case it is better than the original aluminum.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 97728, member: 2907"] Quite a few people in BC have found that the upper valve guide corrodes from condensation and from acid by products of combustion. Robert Watson told me about this problem. Perhaps in really hot dry climates this would not be a problem. The corrosion is in the form of a black alumium oxide paste. That stuff wears the valve stem. I fitted iron bushings into my upper valve guides to prevent this problem. I used some sintered bushings from McMaster Carr. Some other people have used bronze. In either case it is better than the original aluminum. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust valve not right
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