big bore

  1. Will'smotobikes19

    Mikuni VM18 tuning questions

    I started my big bore engine the first time a few minutes ago 48mm big bore cylinder, windowed piston, Oz reed valve and banana pipe- (and before you tell me to ditch the banana pipe this one is different and doesn't have baffles it has far less restriction than a stock muffler I tested blowing...
  2. Will'smotobikes19

    Big bore kits talk

    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...
  3. Will'smotobikes19

    Can I use a big bore piston/cylinder on a stock crank?

    I weighed both the stock piston with the piston pin and rings and the big bore windowed piston and they are both 3.7 oz. My question is can I use the big bore cylinder and piston without using the crank that I bought. The crank needs trued by a machine shop since I was a noob at engine building...
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