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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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<blockquote data-quote="davidd" data-source="post: 85190" data-attributes="member: 1177"><p>Steven,</p><p></p><p>Very nice work. Unfortunately, these old bikes seem to work on for years with some problems without too much complaining. </p><p></p><p>As for the leakdown, I violate the instructions regarding doing the test with the piston at TDC and do it with the piston at BDC, mostly because it is easy. I take out the pushrods and ease the pressure into the cylinder. The piston goes to BDC, but there is no need for anything elaborate to hold the piston at TDC. There could be more scratches up at TDC, which would lower the pressure, but, in general, if you know your engine, you should be close. I run aluminum liners with Nicasil, so scratches are less likely. I suspect that the guides would need replacing just to tighten them up a bit, so I would not spend a lot of time testing them.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 85190, member: 1177"] Steven, Very nice work. Unfortunately, these old bikes seem to work on for years with some problems without too much complaining. As for the leakdown, I violate the instructions regarding doing the test with the piston at TDC and do it with the piston at BDC, mostly because it is easy. I take out the pushrods and ease the pressure into the cylinder. The piston goes to BDC, but there is no need for anything elaborate to hold the piston at TDC. There could be more scratches up at TDC, which would lower the pressure, but, in general, if you know your engine, you should be close. I run aluminum liners with Nicasil, so scratches are less likely. I suspect that the guides would need replacing just to tighten them up a bit, so I would not spend a lot of time testing them. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Fogging for Mosquitos; Valve Guide Issues and Solutions
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