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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...

I picked up a 2008 BSE (Bosuer) 200cc pit bike and the rear rim appears bent. May be possible to fix by truing the rim but I'm not capable and the local labor rates are worth more than what I picked...