lazylightning@mail.r
Active Member
There is a rod length problem with the 66cc now. Alot of the new engines are coming with longer rods and this can mix you up when changing parts. For example the new 66cc's that have appeared everywhere here have longer connecting rods. Instead of being 85mm from center to center, they are now all 89mm from center to center. So you have to buy the new pistons that go with them. They have the piston pin hole 4 mm higher up. These new engines have much less metal on the carb and exhaust mating surfaces on the cylinder jug. So your out of luck if you wanted to widen the exhaust to 25mm round on the outer surface for example. It looks like they are trying to save on aluminum, so the walls are probably thinner at the transfers and will limit your ability to open up and deepen those transfer channels when porting.
This problem should be paid attention closely by vendors to make sure their Chinese partners or middle men thereof do not send them this CRAP!
This problem should be paid attention closely by vendors to make sure their Chinese partners or middle men thereof do not send them this CRAP!