Scooterotica

hi i am looking at converting my smallframe to a vespatronic ignition my problem is what size do i need. the engine is according to the engine number a pk 80 but if already tuned to a 130 parmakit 30mm dellorto carb with 30mm reed valve , full circle crank and zirri gear box and a jl reedspeed down and forward pipe can any one help cheers

Whip the flywheel off and measure the one you have now.
I use a very-near gauge for this.

Small or large taper is the deciding factor.