Hello! I'm new to this forum & motorbiking in general & I could use some info & advice. I have a 66cc 2015 Grube Gt5a Skyhawk & I plan on ordering a cylinder & piston so I can see if I'm capable of porting & polishing them correctly. First I need info on what size to order? All I know is the intake manifold is 40mm. Can anyone provide the specs on the motor? I could also use the size of the cylinder & piston? Thx