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Tech. Advice: Series 'A' 500cc/1000cc Bikes
B.T.H Mag-Dyno
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<blockquote data-quote="greg brillus" data-source="post: 139651" data-attributes="member: 597"><p>I think the fact of the matter is the self generating magnetos today (really CDI units) were actually designed for singles, that can obviously spin over faster.........Kicking a V twin of moderate performance and compression is probably right on the limit of these units.........That was why on the new twins, the Powerdyno mags were converted to 12 volt coil ignition, thereby bypassing the original CDI unit and supplying a switched 12 volt supply to the ignition coil itself........Just for interest sake, some of these bikes actually run stock hemi heads, and/or had the squish band removed or at least modified closer to the stock hemi head........i'm not sure it really made a big difference to starting........Sometimes it actually comes down to a technique to suit that engine........just as many post war twins like to be started in a particular way.........As an example........A Comet that runs a Norton AMC type gearbox needs to be started different to the stock Burman gearbox due to the kicking ratio of the gearbox.........The Norton box seems to need the engine turned over a bit further for a good start.......Simply easing it just over TDC as per normal does not work from my experience.........All good frustrating fun............</p></blockquote><p></p>
[QUOTE="greg brillus, post: 139651, member: 597"] I think the fact of the matter is the self generating magnetos today (really CDI units) were actually designed for singles, that can obviously spin over faster.........Kicking a V twin of moderate performance and compression is probably right on the limit of these units.........That was why on the new twins, the Powerdyno mags were converted to 12 volt coil ignition, thereby bypassing the original CDI unit and supplying a switched 12 volt supply to the ignition coil itself........Just for interest sake, some of these bikes actually run stock hemi heads, and/or had the squish band removed or at least modified closer to the stock hemi head........i'm not sure it really made a big difference to starting........Sometimes it actually comes down to a technique to suit that engine........just as many post war twins like to be started in a particular way.........As an example........A Comet that runs a Norton AMC type gearbox needs to be started different to the stock Burman gearbox due to the kicking ratio of the gearbox.........The Norton box seems to need the engine turned over a bit further for a good start.......Simply easing it just over TDC as per normal does not work from my experience.........All good frustrating fun............ [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
B.T.H Mag-Dyno
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