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wow, very cool that you explored it out. From reading your calculations it probably wouldn't be worth the effort or money to stroke the ZS169 and would require a custom piston I'm sure. Interesting...

I was also wondering about the 171FMM cylinder head (71mm bore) with a 167FMM crank stroke (65mm).

Anyone??

Has anyone attempted to put a Zongshen 167FMM crank and/or rod in a 169FMM motor which would technically stroke it closer to a 250cc?

I believe the ZS167FMM is 67mm bore, 65 (or 66)mm stroke. The...