- Apr 9, 2018
A while back I purchased a 48mm big bore cylinder kit to install on my 2 stroke engine from MZpartsmiami. However I ran into problems with piston height at tdc meaning I needed a spacer. The piston that came with the kit was already scratched up when I received it and it seems to be pretty soft aluminum. I was wondering if a 48mm Stihl piston would work or an aftermarket? They are flat top and I think the wrist pin is the same size. Would it be better to use a 38mm stroke motor or a 40mm? I am thinking about tearing the pk80 motor down replacing all bearings with Nachi and maybe seals. I have a mikuni VM18 and an OZ reed with a 23mm intake I was planning to use on it as well.