SuperJet 61X/62T and Kawai 750/800 flywheel trigger question

[jetskidude1113]

I've been wanting to ask this question for a while now. just to clear my curiosity.. What triggers the Superjet Flywheel to fire, it has 4 magnets but I can seem to fine a trigger or some sort, where as the Kawasaki flywheel have a trigger on the flywheel and trigger the pickup per rotation.

 

[Storbeck]

I'm not 100% certain, but I believe the way this works for a 6m6, 61x, or 62t system is that there is a coil internal to the flywheel, and the four magnets in the flywheel are arranged with their polarity reversed, so that coil sees a north pole, south pole, north pole, south pole for every revolution. The transition from north to south triggers the ignition, so there are two transitions from north to south every revolution. (or maybe it's the transition from south to north, but same idea).

 

[Storbeck]

This little guy, the "pulser" coil.

 

[jetskidude1113]

I know the pulser coil, just trying to understand how it gets trigger and fire

 

[Storbeck]

charge coil charges a capacitor, pulser coil (or trigger in the kawasaki type system) creates a pulse that activates an electronic gadget similar to a transistor (basically an electronic switch, add power here to let power through there) to release the charge from the capacitor.

Slightly more complex ignition systems use circuitry in between to delay the trigger signal based on rpm for a simple ignition curve.

Modern programmable ignition systems don't let the signal from the pulse/trigger directly actuate the release of the charge, it starts a timer in a chip that is programmed to wait a certain length of time before releasing the charge, this is how you can program in different advance curves.