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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="davidd" data-source="post: 57575" data-attributes="member: 1177"><p>Kenny,</p><p></p><p>I don't mind pulling your leg, but we would need to be much closer in proximity! Thanks for the mention. I was, of course, being serious, but do not hesitate to ask if you think I am out of my mind. </p><p></p><p>As usual, Trevor has distilled the essence. I will say that the cylinder above was assembled dry and it broke in wonderfully. I think the use of the term "Dry" has become common because the average assembler uses way too much oil. Everyone has their own system, but I think the "take away" from these lasts posts is that it is extremely important to make sure you have enough friction in the bore so that the rings can bed in and seal properly. </p><p></p><p>Mark is one of the few people I know that tries to ride his Vincent every day. As a result, he knows how well the bikes run when they are in continuous use!</p><p></p><p>By, the way, I usually do a leak down test after break-in to check the sealing of the valves and rings. The number may be anywhere from less than 1% to 5%. If I were riding on the street I would do another test every fall and note the number. When the number gets to high I would plan to do a refresh over the winter. When I broke the top ring and did a leak down test it was 60%. I think you will notice poor performance in the 20% plus area. I would not worry about doing this, necessarily, I just wanted you to know that guessing is not the only method.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 57575, member: 1177"] Kenny, I don't mind pulling your leg, but we would need to be much closer in proximity! Thanks for the mention. I was, of course, being serious, but do not hesitate to ask if you think I am out of my mind. As usual, Trevor has distilled the essence. I will say that the cylinder above was assembled dry and it broke in wonderfully. I think the use of the term "Dry" has become common because the average assembler uses way too much oil. Everyone has their own system, but I think the "take away" from these lasts posts is that it is extremely important to make sure you have enough friction in the bore so that the rings can bed in and seal properly. Mark is one of the few people I know that tries to ride his Vincent every day. As a result, he knows how well the bikes run when they are in continuous use! By, the way, I usually do a leak down test after break-in to check the sealing of the valves and rings. The number may be anywhere from less than 1% to 5%. If I were riding on the street I would do another test every fall and note the number. When the number gets to high I would plan to do a refresh over the winter. When I broke the top ring and did a leak down test it was 60%. I think you will notice poor performance in the 20% plus area. I would not worry about doing this, necessarily, I just wanted you to know that guessing is not the only method. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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