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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Power Arc Ignitions
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<blockquote data-quote="Monkeypants" data-source="post: 124064" data-attributes="member: 2708"><p>Jim, the twin point/twin coil ignition makes this bike very easy to start, it only seems to need a rollover at very low rpm to fire up.</p><p>It may well be the mileage factor makes rollover easier. It's done about 60,000 miles since John McDougall fitted new liners, 8 to 1 low expansion pistons, Honda chrome rings and new upper valve train with RD valve springs etc. On measuring bore wear last year, there was virtually none.</p><p>It showed less than 1 thou total taper in the cylinders. Hastings ring Co recommends reboring at anything over 12 thou. So I need to budget for a rebore somewhere around the 720,000 mile mark<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>As far as ease of kickover, I seem to recall that it was about the same old same old right after the rebuild.</p><p>I did gain 2 mph on Dyno hill!</p><p></p><p>Your bike may well be higher compression.</p><p>My other Rapide is 9 to one with just 4,500 miles since everything new.</p><p>It does require a bit more effort, in part due to compression, but mainly because the single point D ignition does not seem quite as willing to light up as the twin point twin coil setup does. It can be arm started as well, just takes a bit more push.</p><p></p><p></p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 124064, member: 2708"] Jim, the twin point/twin coil ignition makes this bike very easy to start, it only seems to need a rollover at very low rpm to fire up. It may well be the mileage factor makes rollover easier. It's done about 60,000 miles since John McDougall fitted new liners, 8 to 1 low expansion pistons, Honda chrome rings and new upper valve train with RD valve springs etc. On measuring bore wear last year, there was virtually none. It showed less than 1 thou total taper in the cylinders. Hastings ring Co recommends reboring at anything over 12 thou. So I need to budget for a rebore somewhere around the 720,000 mile mark:) As far as ease of kickover, I seem to recall that it was about the same old same old right after the rebuild. I did gain 2 mph on Dyno hill! Your bike may well be higher compression. My other Rapide is 9 to one with just 4,500 miles since everything new. It does require a bit more effort, in part due to compression, but mainly because the single point D ignition does not seem quite as willing to light up as the twin point twin coil setup does. It can be arm started as well, just takes a bit more push. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Power Arc Ignitions
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