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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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<blockquote data-quote="gwild" data-source="post: 22747" data-attributes="member: 242"><p>Thanks ClevTrev for the interesting and informative article. </p><p>For a beginner like me it is extremely helpful.</p><p></p><p>In one section it mentions that 'pinging' (from post spark detonation) has a characteristic tone of 6400 Hz.</p><p> I used a <a href="http://www.digital-recordings.com/cgi-bin/www-dfg-sine.cgi" target="_blank">digital function generator from the web</a> to generate a tone +- the quality of my headphones, and I can convince myself that the sound emitted from my engine seems in roughly the same ballpark.</p><p>With this positive result I checked the timing and found it firing rather later than 34 degrees BTDC. I re-timed, re-assembled, and the bike fired up by gently leaning on the lever.</p><p>Positive result- the bike started easier, idled easier, and best of all felt twice as powerful- before 50 was about the limit, now 65 uphill isn't much of a challenge.</p><p></p><p>There's still a slight metallic noise which I couldn't hear before, but then this IS a Vincent even if only half a one.</p><p></p><p>Question: from a plug test learnt from theory, my plug looks similar to <a href="http://www.superstreetonline.com/techarticles/130_0703_reading_spark_plugs/photo_04.html" target="_blank">this</a>. Should I richen the mixture slighly as this was a short run on a coldish day? If so, where should I start?</p><p></p><p>thanks to all for pointers, I'm amazed what a different it's made!</p><p></p><p>gwild</p></blockquote><p></p>
[QUOTE="gwild, post: 22747, member: 242"] Thanks ClevTrev for the interesting and informative article. For a beginner like me it is extremely helpful. In one section it mentions that 'pinging' (from post spark detonation) has a characteristic tone of 6400 Hz. I used a [URL="http://www.digital-recordings.com/cgi-bin/www-dfg-sine.cgi"]digital function generator from the web[/URL] to generate a tone +- the quality of my headphones, and I can convince myself that the sound emitted from my engine seems in roughly the same ballpark. With this positive result I checked the timing and found it firing rather later than 34 degrees BTDC. I re-timed, re-assembled, and the bike fired up by gently leaning on the lever. Positive result- the bike started easier, idled easier, and best of all felt twice as powerful- before 50 was about the limit, now 65 uphill isn't much of a challenge. There's still a slight metallic noise which I couldn't hear before, but then this IS a Vincent even if only half a one. Question: from a plug test learnt from theory, my plug looks similar to [URL="http://www.superstreetonline.com/techarticles/130_0703_reading_spark_plugs/photo_04.html"]this[/URL]. Should I richen the mixture slighly as this was a short run on a coldish day? If so, where should I start? thanks to all for pointers, I'm amazed what a different it's made! gwild [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet badly tuned or just underpowered?
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