Im in the middle of building a 139fmb engine from varies parts and pieces, but I am having a hard time finding some quality parts.
So I hope you guys can help me out, seeing that you guys have alot of experience with this type of engine.
The main thing I wanna build is a reliable 72cc 139fmb but maybe somewhere later down the road upgrade the cylinder and timing chain to a 110cc.
So the crankshaft has to be able to handle both.
Here are the parts Im having a hard time to find, atleast of good quality:
Reinforced valve springs
Reinforced Manual clutch springs.
Reinforced clutch plates
I hope you guys can help me out