Here's some interesting info from SJmaster I saved from a while back:
Yamaha CDi flywheel stator info
6M6 box (650 models) 6500-6600 limiter works on 61x system
61x box (701 94/95) 7050-7150 limiter works on 650s but not 62T systems
62T box (701 96+) 7050-7150 limiter works only on 62T systems
SJ Master: I have extensively tested the 61X and 62T on our engine simulation machine. If a 61X and 62T CDI are operated on the same stator, the outputs (high voltage) at any given rpm is about the same. The same cannot be said if the CDIs are used with thier respective stators. The 62T has an increased output up to around 2500, then about the same as the 61X up to the rev limit, which varies slightly. I have unpotted a few of these, and the general circuit trace layout appears to be about the same, but the component values and tolerances seem to vary regardless of generation.
I believe the increased output of the 62T is mostly due to the beefed up charge coil and stronger magnets, and not any difference in CDI design.
You can convert any motor to either system, as long as matching flywheels are used, as the 61X is smaller in diameter.
It is interesting to note (for good starting performance) that the 62T setup generates a nice health spark with a quick low torque hand spin of the flywheel (on the stator machine), in less than one revolution, and the 61X always requires a much more forceful spin to even get the first spark, which is visable less powerful on the calibrated spark gap (6mm), which usually occures in at least one revolution, sometimes more.
ancake:
