OK what does the crank trigger aka pick up coil do ...
If there is continuity between the metal tounge that hits the advancer and ground -- when the advancer hits it... it connects the 2 soldered terminals ??? Is that waht it does... but then it has a 1 cycle delay or something right... else how will the spark advance be made by the black box depending on rpm...
Cool.
Srinath.
It's an inductive pick-up. There is no mechanical contact, just the metal tab on the rotor passes through the magnetic field from the pick-up that generates an electrical signal.
I believe the advance is handled more like a delay at low rpm, which reduces at higher rpm.
K no mech contact... also I have noticed the resistance readings on the back part flash to prolly 0 just for an instant and then back to OL - open on my multimeter even when you have steel contacting the tounge of the plate. Ok the advancing of spark part... it is done by the black box, and each contact (fly by) by the tongue of the advancer... sets the spark for the next firing right. Depending on how often the spikes to 0 resistance are comming the black box will either delay the whole time to next spike or sprk 32 degrees equivalent time before the next spike... some like that right. Also on my vulcan the pick ups make contact with the rotor always (maybe very very close not touching) ... when the spark needs to hit... the rotor has a hole at that spot... is that cos the rotor is a magnet, and maybe the pick up isn't. Anyway I am getting smarter by the instant being on this site... So now just how to gorilla something to work on my virago... and KevinC - Thanks.
Cool.
Srinath.
It's pretty easy to detect any change in the inductance - either a hole or a tab.
The ICU may even determine the rpm by the dwell time of the tab in the magnetic field, not just the rate it sees the tab. I think the tab is wider on the California models, so that may cause the ICU to behave differently.
The CA tab was little wider than the 49er... and Bob B's tab was narrower than both... which actually was a copy of the V&H he said... that nrrowing of the tab if the dwell is used for rpm will make the black box think its running a higher rpm than it actually is... and make it advance more...
Cool.
Srinath.