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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Poorish compression and piston leak by
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<blockquote data-quote="davidd" data-source="post: 43106" data-attributes="member: 1177"><p>Wow, a bore scope, but no leak down tester! We know which one is more fun. I am sorry that it looks so dire so quickly after the rebuild. I would presume that grit at sometime went into the cylinder. This is a problem that I used to have on the racer, particularly when running at Daytona where there is sand in the air almost all the time. It is also difficult to use air cleaners because of the performance issues. The cylinder would score very quickly. </p><p></p><p>I hate to suggest my solution which was to use a Nikasil coated cylinder. I know it is costly, but so is the alternative. If you use an aluminum sleeve, you can also use the old muff.</p><p></p><p>I think you did the right thing by doing a simulated leak down test. The if you can supply compressed air to the spark plug hole by some method it will give you the same result. For this type of diagnosis, you do not really need the data supplied by the gauges.</p><p></p><p>It has been said before, but the singles do need a lot of piston clearance. There is a lot of uneven and rapid heating when using a single. If the piston clearance closed to much it would probably produce similar results. It will be interesting to see what you find on tear down.</p><p></p><p>Best of luck,</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 43106, member: 1177"] Wow, a bore scope, but no leak down tester! We know which one is more fun. I am sorry that it looks so dire so quickly after the rebuild. I would presume that grit at sometime went into the cylinder. This is a problem that I used to have on the racer, particularly when running at Daytona where there is sand in the air almost all the time. It is also difficult to use air cleaners because of the performance issues. The cylinder would score very quickly. I hate to suggest my solution which was to use a Nikasil coated cylinder. I know it is costly, but so is the alternative. If you use an aluminum sleeve, you can also use the old muff. I think you did the right thing by doing a simulated leak down test. The if you can supply compressed air to the spark plug hole by some method it will give you the same result. For this type of diagnosis, you do not really need the data supplied by the gauges. It has been said before, but the singles do need a lot of piston clearance. There is a lot of uneven and rapid heating when using a single. If the piston clearance closed to much it would probably produce similar results. It will be interesting to see what you find on tear down. Best of luck, David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Poorish compression and piston leak by
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