XR50 / ZB50 / CRF50 / ST50 / Z50 / JC Knight. 88cc Big-Bore kit alloy for the 50cc CDi engines (new type -GK4-) Complete with a 70cc ultra head and Z28 race cam ! (valves allready installed)

XR50 / ZB50 / CRF50 / ST50 / Z50 / JC Knight. 95cc Big-Bore kit for the 50cc CDi engines (new type -GK4-) Complete with a 70cc ultra head and Z28 race cam ! (valves allready installed)

At last, a cilinderhead special for 85cc and much more ! Testers allready say it beats the 3 and 4 valve heads on the track.

Cilinder kit complete. with piston kit 6v 50cc head Incl. gasket set. The cilinder indicates 72cm3

95cc Cylinder kit HCR 6v-70head. This set will fit all old style 6-volt engines with the old style 70cc head.