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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="Nigel Spaxman" data-source="post: 95917" data-attributes="member: 2907"><p>I have been doing a lot of experimenting with timing recently. My bike is a Rapide with MKII 105 cams and 8:1 pistons. It is not very fussy about the timing. I run the bike usually on 94 Octane gas and it is almost impossible to get the bike to knock or pink even lugging it in to low a gear up hill when it's hot. The only time I have heard the bike pink at all was on timing that was very over advanced. Probably the timing was set around 42 degrees BTDC when I heard this pinking, and it was very slight. When the timing is really late the engine feels very soft and opening the throttle results in more noise and not so much acceleration. I have a Dyna 2000 ignition (for a Harley) modified for the Vincent. A lot of people around Vancouver use this system. It can be programed for two advance curves any way you want by connecting it to a computer by a usb cable. There is a vacuum operated switch. One curve is used at high vacuum and one for lower vacuum. On my bike all these extra functions seem a bit unnecessary. My bike seems to like full advance by about 2000 RPMs. I can ground the vacuum operated switch or leave it open to select from the two curves to experiment with the timing. I bought a very nice new timing light from MSD that is really bright. It is one of only a few lights you can get that will work well with a multi spark ignition like the Dyna. Also this light flashes even at kick over speeds so you can even check the timing at kick over speeds (I haven't bothered doing that yet) I have a mark on the plastic gear that drives my ignition. I put that mark at 34 degrees btdc because that was the timing that many people recommend now days. I have tried everything over the last few weeks and I have decided I prefer a full advance timing of 38 degrees BTDC. When I have the timing set this way my bike has the best acceleration and gets the best gas mileage. I get between 55 to 58 MPG (Imperial) and when the timing is retarded to below 32 degrees the mileage drops below 50. I am going to keep experimenting, but that is what I am settled on now. The trouble is with the two advance curves and the vacuum switch there are to many possibilities. I haven't even started on that yet. I think some other engines with squish heads or higher compression probably would prefer less advance but not this engine. My engine is pretty mildly tuned, I think that many bikes are even more mildly tuned than mine and would probably run with the timing pretty close to the original recommendations like mine does.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 95917, member: 2907"] I have been doing a lot of experimenting with timing recently. My bike is a Rapide with MKII 105 cams and 8:1 pistons. It is not very fussy about the timing. I run the bike usually on 94 Octane gas and it is almost impossible to get the bike to knock or pink even lugging it in to low a gear up hill when it's hot. The only time I have heard the bike pink at all was on timing that was very over advanced. Probably the timing was set around 42 degrees BTDC when I heard this pinking, and it was very slight. When the timing is really late the engine feels very soft and opening the throttle results in more noise and not so much acceleration. I have a Dyna 2000 ignition (for a Harley) modified for the Vincent. A lot of people around Vancouver use this system. It can be programed for two advance curves any way you want by connecting it to a computer by a usb cable. There is a vacuum operated switch. One curve is used at high vacuum and one for lower vacuum. On my bike all these extra functions seem a bit unnecessary. My bike seems to like full advance by about 2000 RPMs. I can ground the vacuum operated switch or leave it open to select from the two curves to experiment with the timing. I bought a very nice new timing light from MSD that is really bright. It is one of only a few lights you can get that will work well with a multi spark ignition like the Dyna. Also this light flashes even at kick over speeds so you can even check the timing at kick over speeds (I haven't bothered doing that yet) I have a mark on the plastic gear that drives my ignition. I put that mark at 34 degrees btdc because that was the timing that many people recommend now days. I have tried everything over the last few weeks and I have decided I prefer a full advance timing of 38 degrees BTDC. When I have the timing set this way my bike has the best acceleration and gets the best gas mileage. I get between 55 to 58 MPG (Imperial) and when the timing is retarded to below 32 degrees the mileage drops below 50. I am going to keep experimenting, but that is what I am settled on now. The trouble is with the two advance curves and the vacuum switch there are to many possibilities. I haven't even started on that yet. I think some other engines with squish heads or higher compression probably would prefer less advance but not this engine. My engine is pretty mildly tuned, I think that many bikes are even more mildly tuned than mine and would probably run with the timing pretty close to the original recommendations like mine does. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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