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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Correct Compression? Rapide
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<blockquote data-quote="Monkeypants" data-source="post: 116632" data-attributes="member: 2708"><p>Try a leakdown test. You might find the engine is in good shape.</p><p>Compression tests are a bit iffy with electric start and even moreso with a kickstart.</p><p>A leakdown test will also tell you where the problem is, if there is one.</p><p>Leakdown testers are quite inexpensive.</p><p>I had an issue with low compression on a Rapide. The leakdown tester agreed with what I was noticing on kickover. The leakdown test pointed to the valves as the problem, one cylinder much worse than the other.</p><p>On inspection it was the valves that were leaking.</p><p>There were tiny bits of carbon baked onto the valve seats.</p><p>This occurred when running with worn out carbs.</p><p>A bit of valve lapping with a cordless drill fixed it and brought compression leakdown back in the green range ( excellent)</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 116632, member: 2708"] Try a leakdown test. You might find the engine is in good shape. Compression tests are a bit iffy with electric start and even moreso with a kickstart. A leakdown test will also tell you where the problem is, if there is one. Leakdown testers are quite inexpensive. I had an issue with low compression on a Rapide. The leakdown tester agreed with what I was noticing on kickover. The leakdown test pointed to the valves as the problem, one cylinder much worse than the other. On inspection it was the valves that were leaking. There were tiny bits of carbon baked onto the valve seats. This occurred when running with worn out carbs. A bit of valve lapping with a cordless drill fixed it and brought compression leakdown back in the green range ( excellent) Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Correct Compression? Rapide
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