I got my orange cdi from scrappy dog scooters and it worked best on the red 155cc motor.
The blue 183cc motor likes the stock cdi, probably due to the larger piston and the cylinder spacer causing a bit of advance in cam timing.
Larger pistons like less timing for a better burn is what I remember from my 350 to my 406 small block chevy. My 350 ran great with 40/42 total timing and my 406 liked 35/36 timing.
I got to test the 13/43 gears yesterday and went to a 127.5 main jet from a 125 and it runs awesome. I changed the gear oil two times after running it to get any metal or shavings out from opening the case.
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