97-07 VT1100C Ignition Pulse - Honda Shadow Forums : Shadow Motorcycle Forum
 
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post #1 of 7 (permalink) Old 05-21-2019, 10:06 AM Thread Starter
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97-07 VT1100C Ignition Pulse

So this is my first technical post, and I apologize in advance if I look like a total n00b here, but I've looked through this forum and all over the web for hours trying to find a simple explanation for this but keep going down the same rabbit holes with no answers...

Why does the "pulser plate" have 9 teeth, and only on one side? I can't find any other similar motorcycles that use this design.

The best I can come up with is that because it's 4-stroke, on the crankshaft, spinning twice as fast as the camshaft, therefore...one side (half)? it still seems to me with this large "sync gap" on the wheel would not run smoothly. IDK...

I feel like I should know the answer to this but am tired of looking, hopefully someone here can help me out! Any ignition system information would be welcome also!

2000 VT1100C Spirit, and yes I have the Honda Shop Manual for it...it seems to go out of its way to not discuss the Ignition system, the "pulser plate" and its operation!

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post #2 of 7 (permalink) Old 05-21-2019, 11:46 AM
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The plate has 9 nubs and is used on a variety of Honda bikes, different bikes use different combinations.
The ICM box is model specific and figures it out, magic happens in that thing.
The VT1100 bikes with this setup use nub #8 to trigger Cylinder 1 and nub #9 to trigger Cylinder 2.

FWIW my '99 VT750 which has wider cylinder spacing (52 degrees instead of 45) uses #7 and #9.

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post #3 of 7 (permalink) Old 05-21-2019, 11:57 AM Thread Starter
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Yea I see what you're saying, I was able to find this image earlier, which is the best I've got so far. It doesn't really explain why the huge gap though. it seems like every other rotor/reluctor/pulser/whatever is symmetrical in nub placement. From what I know when calculating firing order for 4-stroke: 720* (2 rotations) and divide by # of cylinders (2) and you get 360, which doesn't really explain this design lol.
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post #4 of 7 (permalink) Old 05-21-2019, 12:22 PM
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I would guess that the huge gap is the bottom of the stroke where no ignition would occur.

http://2007 Shadow Spirit VT750C2, Ride bell by h13man, Ride cross by Capt D
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post #5 of 7 (permalink) Old 05-21-2019, 02:01 PM
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Probably similar my old 1983 that has just one trigger plate that signals the generators every revolution. But mine has a basic early style TCI ignition which was an electronic replacement for the points system.

Whereas the newer bikes have real CDI and have timing adjustment capabilities that the various trigger points can accomplish. Like the crank position sensors on cars and the computer can detect and adjust timing from them.
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post #6 of 7 (permalink) Old 05-22-2019, 06:34 PM
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One tab cuts and the next keeps the current for the transistor, which in turn gives you the spark for all your plugs (4)
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post #7 of 7 (permalink) Old 05-23-2019, 07:47 AM
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the 'blank' space serves to identify the next pulse as #1
blip blip blip space blip (#1) blip (#2) blip (#3) .....
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