When I was struggling with rev and temperature issues, I started playing with the stator plate. I filed out the mounting holes a little bit and rotated to retard the timing an extra couple of degrees. I actually had good success with this, but wanted to try some different CDI’s to try and find one with a curve. The two I ordered were the A3202, and the Yamaha Jog box, since they are the two most mentioned in the Hobbit community.
First up the A3202 which arrived first. Wired it up, and it started first kick. Though it would not idle properly and bogged and died when so much as breathing on the throttle. Strike this one off the list.
Next up, with hopes low, was the Yamaha Jog box. Wired her in, kicked over straight away. Idled nice and steady so took it for a run. The biggest plus here was the operating temperature which was a good 20-30deg Celsius cooler (down from ~440F peak to about 390F). Only downside was less peak revs and a couple mph less top speed. On the factory CDI I was running about 57km/h (35mph) at over 11,000rpm. The Jog CDI was about 54km/h (33mph) at a bit past 10,000rpm. I am going to test both CDI’s back to back again, just to confirm.
I’ll also be chucking the modded reed valve back in, to see if there is any difference.