ok on another post coils have been brought up, this is a few question to darren and john;

some coils have been wound differently? here are some different types of coils below, a lot of riders have no idea on their coil and the performance gains to be had, as there is no information regarding this, so can you give everyone more information.

what is the differance with the spark output?
what is the maximum rpm output for these coils?
which ones have had timing changes wound into them? i'm thinking the victory has a stage, but unsure?
what is the difference to a 3 iron to a 2 iron coil and benifits to be had?

a standard coil?

3 irons coil?

high voltage coil?

ducati coil?

victory ignition coil?

grc coil?

polini coil?

and i have a red 3 irons coil on my bike but dont know the make, some info on that would be nice too if you know what it is.

thanks

If you can provide part numbers then maybe I can endevour to explain the differences. There are only two coil manufacturers.
I do know for a fact that some of the BZM coils specified for Blata reps do not work because of the early model copy flywheels.
You can be sure that the BZM (Selletra) and Polini (Ducati) have electronic triggers. As for the china coils, I dont know for sure. In regards to the high voltage output, it totally depends on the secondary coil winding. Typically you could expect a turns ratio of about 100:1 in order raise the voltage required to spark up around 5000V and by the magneto principle, the voltage will increase with higher revs as the intensity of the collapsing magnetic field is increased by rapid fall time by the use of an electronic trigger (as opposed to contact points).
You can use a strobe light and a degree wheel to check the spark advance of your coil as Glen has done (but don't try and video capture it!)

i dont know the part numbers but elaborate on the BZM (Selletra) and Polini (Ducati) as they are 2 you deal with,

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is a good read about ignitions and coils. Be sure to read Parts 1 & 2.

that is a mad find john