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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet timing
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<blockquote data-quote="greg brillus" data-source="post: 178393" data-attributes="member: 597"><p>I've built a 600 Comet and 600 Norvin singles, not including my Norvin racer......both these used the Norton gearboxes, plus belt drive primary drives........ I found on starting that easing the piston just over TDC with the decompressor and then kicking with a full stroke of the lever would not start the engine. It would either simply fail to start or backfire........This led me to believe that the kickstart ratio was different.......So instead of easing past TDC..... I set up the kick start lever at the 9 o'clock position, squeezed the decomp lever and pushed the k/s lever to the bottom of the stroke......let the lever return full up, then full kick down.......start and run every time ........If the K/S ratio was different, my guess is it's not turning the engine over as far compared to the Burman box.......I did some checks at the time but can't remember what I found.......other than with the slight change in starting procedure, it worked pretty much every time thereafter........One bike used a Royal Enfield decomp valve in the second spark plug hole and the other used the later TPV head with 12 volt solenoid decomp valve in the head, and a simple horn type push button on the bars......both these worked very well........much easier than the stock Vincent decomp set up.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 178393, member: 597"] I've built a 600 Comet and 600 Norvin singles, not including my Norvin racer......both these used the Norton gearboxes, plus belt drive primary drives........ I found on starting that easing the piston just over TDC with the decompressor and then kicking with a full stroke of the lever would not start the engine. It would either simply fail to start or backfire........This led me to believe that the kickstart ratio was different.......So instead of easing past TDC..... I set up the kick start lever at the 9 o'clock position, squeezed the decomp lever and pushed the k/s lever to the bottom of the stroke......let the lever return full up, then full kick down.......start and run every time ........If the K/S ratio was different, my guess is it's not turning the engine over as far compared to the Burman box.......I did some checks at the time but can't remember what I found.......other than with the slight change in starting procedure, it worked pretty much every time thereafter........One bike used a Royal Enfield decomp valve in the second spark plug hole and the other used the later TPV head with 12 volt solenoid decomp valve in the head, and a simple horn type push button on the bars......both these worked very well........much easier than the stock Vincent decomp set up. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet timing
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