36mm ESP Modified & Championship Ported Zenoah 4-bolt Cylinder for 30.5cc

The ESP Modified and Championship Ported Zenoah cylinder is for 30.5cc engines only. The bore has been machined deeper so you don't have to stack gaskets for head clearance on stroker motors. This cylinder is prefered by racers because the port timing is not affected by stacked gaskets. The porting of the intake, exhaust, and transfer ports significantly increases engine RPM's and performance. 

 

This is for 4-bolt Zenoah engines only!