mechanical moped Ignition Advance

Ok, so, the other day, I threw around the idea of a vacuum advanced full loss battery powered ignition for mopeds on the forums. It's simple. Get a pneumatic cylinder, some linkages and a return spring, tap your intake for a nipple and go...

these are the cylinders I had in mind:

That's cool because it's automatic and all, but you'd have to fool with spring tensions, regulating the vacuum so it didn't advance too soon, worrying about it jamming and blowing your motor etc. etc. etc.

I was watching some videos today and apparently, old indians have left and right twist grips. One for the distributor and one for the throttle...

Cable linkages would be so much more fun, reliable and just BA.

Seems simple enough. I think I'll do this to the 80cc reedvalve sachs motor, because the my mk65 za50 maxi won't rev that high and neither will my 70cc tccd za50'd swinger 1...

Maybe I'll run it on the rat polini magnum for the nashville rally next year... ugh, that's what I was planning on using the HPI internal rotor for though. I have stock piled so many parts and need to build so many motors.