Discussion Starter · #1 ·
With the bore and stroke 56.0 x 50.6mm on a stock Z125 Pro. What do you think the BBK will be? That is already a big piston in there. Maybe play with the wrist pin position and a slightly larger piston or will it have to be a crank swap? I would hate to split the cases on this new engine but it wouldn't be the first time. What do you guys think?