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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Ignition Timing 2018
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<blockquote data-quote="Robert Watson" data-source="post: 97080" data-attributes="member: 38"><p>My Take on timing is that</p><p>1) The ATD is a pretty primitive device and I think the factory recommendations were a compromise to deal with what they had.</p><p>2) Many modern devices have a fixed advance curve that is a "best guess" at what the engine needs.</p><p></p><p>I have been running a 2 stage Harley setup for some 20+ years. I set it when I first installed it by an initial advance of about 34 degrees although really can't recall how I did that. I then took it for a ride. Tried to make it detonate and couldn't</p><p>Advanced it a little on the adjustable trigger plate. Still no issues.</p><p>Repeat</p><p>Repeat - Ahh funny noises when lugged hard in higher gears. </p><p>Turn back a little.</p><p></p><p>leave alone for more than 20 years...... Change the plugs once a decade, if I remember.</p><p></p><p>When it was installed I think we surmised that at higher RPM it was reaching as much as 50 deg advance... with not too much throttle, and when the throttle was wicked open it switches to a more retarded curve. </p><p></p><p>I suppose it would be more useful if I put my Herve Hamon timing disk on and actually checked to see where it all was. </p><p></p><p>As for the Flash calling for 42 I wonder if that was an adjustment in the compromise knowing that it would be revving higher generally than a street Comet at 38??</p><p></p><p>How's that for comments providing no real world use to anyone!</p></blockquote><p></p>
[QUOTE="Robert Watson, post: 97080, member: 38"] My Take on timing is that 1) The ATD is a pretty primitive device and I think the factory recommendations were a compromise to deal with what they had. 2) Many modern devices have a fixed advance curve that is a "best guess" at what the engine needs. I have been running a 2 stage Harley setup for some 20+ years. I set it when I first installed it by an initial advance of about 34 degrees although really can't recall how I did that. I then took it for a ride. Tried to make it detonate and couldn't Advanced it a little on the adjustable trigger plate. Still no issues. Repeat Repeat - Ahh funny noises when lugged hard in higher gears. Turn back a little. leave alone for more than 20 years...... Change the plugs once a decade, if I remember. When it was installed I think we surmised that at higher RPM it was reaching as much as 50 deg advance... with not too much throttle, and when the throttle was wicked open it switches to a more retarded curve. I suppose it would be more useful if I put my Herve Hamon timing disk on and actually checked to see where it all was. As for the Flash calling for 42 I wonder if that was an adjustment in the compromise knowing that it would be revving higher generally than a street Comet at 38?? How's that for comments providing no real world use to anyone! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Ignition Timing 2018
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