I have been searching for a cdi system which fires at 90 for almost a year for my twin cylinder flat track bikes.
There are some guys in Australia doing some wild stuff to the banshee engines, and you can see the mechanical information, and other technical information regarding the difference between the two degrees, and how the 180 is harder on the engine components, due to the bang effect of both rods hiiting top and bottom at the same time.
Searching TSS500, will bring you there, then you can search around and do some reading.
The reason I have entered the vmax region is to obtain info from you guys on the vmax 750 and 800 cdi boxes.
Both of my engines came stock with 180 cranks and these motors break the rear tire loose so quick, it's hard to keep them on a blue groove oval flat track.
We run about 85 -95 on a 1/2 mile straight away, then back them into the corner and roll the throttle back on from about 50-55, until almost the whole way through and then peg it.
The harley davidson engines which are built at 90 degree, are hard to beat and pretty much dominate, because the engine rolls on a lot smoother.
I have purchased two complete vmax4 units from a salvage yard and they should be here in a few days.
I will reverse the flywheel and mount the stator and pickups to the engine case outside the crank seal, and run two single coils.
I haven't been able to find any dyno information so far, that would start at a lower rpm range than what I have seen on this site at 8,500.
If anyone has any info they can share, I would sure be greatfull.