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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No compression
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<blockquote data-quote="Tom Gaynor" data-source="post: 8231" data-attributes="member: 4034"><p><strong>Comets with no compression</strong></p><p></p><p>A local rider had a Comet with almost no compression. It would cough, but wouldn't really run. There were two things wrong with it.</p><p>One was that the valve timing, although correct to the marks, was wrong. I believe that Comets with timing marks that are wrong are far more common than twins similarly afflicted. A quick check is that both valves should have more or less equal lift at TDC.</p><p>(The other was that the muff was so slack on the liner that there was evidence of gas transit between the two. (The piston to bore seal was actually pretty good.) How slack? When it was sent to have an o/s liner fitted, the fitter put the barrel on his bench and lit the gas axe to heat the muff. As he did, the muff slid off the liner under its own weight.)</p><p>Prior to all of this the bike had been running: not well, but loudly.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 8231, member: 4034"] [b]Comets with no compression[/b] A local rider had a Comet with almost no compression. It would cough, but wouldn't really run. There were two things wrong with it. One was that the valve timing, although correct to the marks, was wrong. I believe that Comets with timing marks that are wrong are far more common than twins similarly afflicted. A quick check is that both valves should have more or less equal lift at TDC. (The other was that the muff was so slack on the liner that there was evidence of gas transit between the two. (The piston to bore seal was actually pretty good.) How slack? When it was sent to have an o/s liner fitted, the fitter put the barrel on his bench and lit the gas axe to heat the muff. As he did, the muff slid off the liner under its own weight.) Prior to all of this the bike had been running: not well, but loudly. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No compression
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