New GZR-30.5 cc Zenoah Pro Mod cyl kit NO CRANK . Since we were the first to make the 36mm marine engines. We now have the most powerful 36mm pro mod cyl kit on the market. We have done endless testing with our new crankshafts and with our new port design. You get the torque of the 32cc and the rpms of a 26cc. You show up to the lake to be a winner.

 Ths is what you get

New port design 95% hand ground pro mod cyl done at our shop.

 Pro mod piston and ring set to our specs 

All other parts as seen in picture.

Go with the best not one the rest.

 NOTE: If you have the previous 29.6 crank please let us know as i can adjust the cylinder for that crankshaft.