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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="KennyNUT" data-source="post: 57492" data-attributes="member: 3057"><p>Howard,</p><p></p><p>I came across this:</p><p></p><p><a href="http://www.voc.uk.com/net/docs/3.5f/3.5-608-17.pdf" target="_blank">http://www.voc.uk.com/net/docs/3.5f/3.5-608-17.pdf</a></p><p></p><p>an apparent quick fix where the pistons (twin) are positioned to bottom dead centre and the timing chest cover removed, the breather gear is pulled out of its mating position, turned anti-clockwise by two teeth, pushed back in and the case re-assembled. Its called Busby's Breather Breakthrough (BBB) and its in MPH edition, #608, page 17. It sounds too easy! Especially, as Martyn in post #40 describes something much more elaborate.</p><p></p><p>There are other follow up points that also discuss a Breather Cap, used in series D.</p><p></p><p>If Simon says <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> the head is spot on and he has already said piston and liner look like new, is there too much pressure in the crankcase as per Martyn's learning's earlier, pushing oil past the rings? Should I try the BBB (with the single at BDC) or buy a series D breather cap for additional reduction in crankcase pressure? The Comet already has a case breather off the left hand side of the crankcase just under the float chamber, seen below and it has (another breather) that oils the chain!</p><p></p><p>[ATTACH=full]3292[/ATTACH]</p><p></p><p>I feel I am chasing different things, now.</p><p></p><p>I don't want to be taking the head off again and again and changing rings, then drilling the piston , then working on the breather.</p><p></p><p>Another thing that is nagging me is why the exhaust valve looks so sooty (matt black) compared with the inlet valve and the top of the combustion chamber looks so lightly used.</p><p></p><p>[ATTACH=full]3293[/ATTACH]</p><p></p><p>Maybe I should rest up and wait on Simon for a bit in case he finds something in the head components that was not visually obvious !</p><p></p><p>K.</p></blockquote><p></p>
[QUOTE="KennyNUT, post: 57492, member: 3057"] Howard, I came across this: [url]http://www.voc.uk.com/net/docs/3.5f/3.5-608-17.pdf[/url] an apparent quick fix where the pistons (twin) are positioned to bottom dead centre and the timing chest cover removed, the breather gear is pulled out of its mating position, turned anti-clockwise by two teeth, pushed back in and the case re-assembled. Its called Busby's Breather Breakthrough (BBB) and its in MPH edition, #608, page 17. It sounds too easy! Especially, as Martyn in post #40 describes something much more elaborate. There are other follow up points that also discuss a Breather Cap, used in series D. If Simon says :) the head is spot on and he has already said piston and liner look like new, is there too much pressure in the crankcase as per Martyn's learning's earlier, pushing oil past the rings? Should I try the BBB (with the single at BDC) or buy a series D breather cap for additional reduction in crankcase pressure? The Comet already has a case breather off the left hand side of the crankcase just under the float chamber, seen below and it has (another breather) that oils the chain! [ATTACH=full]3292[/ATTACH] I feel I am chasing different things, now. I don't want to be taking the head off again and again and changing rings, then drilling the piston , then working on the breather. Another thing that is nagging me is why the exhaust valve looks so sooty (matt black) compared with the inlet valve and the top of the combustion chamber looks so lightly used. [ATTACH=full]3293[/ATTACH] Maybe I should rest up and wait on Simon for a bit in case he finds something in the head components that was not visually obvious ! K. [/QUOTE]
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