I have a 125 Pro FM237 forward kick for my next project and am considering sizing up the barrel and piston to a 200 when I go through the engine.
I would love to hear from anyone who has done this first hand on either the Fantic or a Minarelli rear kick engine.
What other than the barrel, piston and carb will need changing?
Will the 125 flywheel be heavy enough?
I haven't ridden a 125 yet and wonder if the 3hp increase is really worth it, especially if the 125 barrel is in good condition.