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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="vibrac" data-source="post: 165441" data-attributes="member: 60"><p>All the squish I have is the difference between the standard bore and 90 bore which at best is a circular 3mm protrusion of the head 'flat' ((90-84)/2) however I also went for a lowish 8.5 compression and when I was measuring the volume with my trusty play dough (around 75cc I think I remember) I checked the small land clearance and was about 35 thou A bit tight but it seems oK for 18 months (including a columbres rally)</p><p>I was going try twin plugs as I have all the BTH gear for that but as I was short of time and the head needed work I had a reconditioned shadow head so I used that instead Also since I dont use the standard knitting needles for a decompressor I was also unable to use a RE decompressor however amazingly driven by a small lithium battery in a standard dummy box the Comet has no trouble starting. Recently after a three month sitting in the garage (too much work on a certain racer) and without draining sump, renewing petrol or charging battery, I rotated the engine twice on kickstart tickled carb and pressed button and she started.</p></blockquote><p></p>
[QUOTE="vibrac, post: 165441, member: 60"] All the squish I have is the difference between the standard bore and 90 bore which at best is a circular 3mm protrusion of the head 'flat' ((90-84)/2) however I also went for a lowish 8.5 compression and when I was measuring the volume with my trusty play dough (around 75cc I think I remember) I checked the small land clearance and was about 35 thou A bit tight but it seems oK for 18 months (including a columbres rally) I was going try twin plugs as I have all the BTH gear for that but as I was short of time and the head needed work I had a reconditioned shadow head so I used that instead Also since I dont use the standard knitting needles for a decompressor I was also unable to use a RE decompressor however amazingly driven by a small lithium battery in a standard dummy box the Comet has no trouble starting. Recently after a three month sitting in the garage (too much work on a certain racer) and without draining sump, renewing petrol or charging battery, I rotated the engine twice on kickstart tickled carb and pressed button and she started. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Squish
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