Original Zenoah brand crank shaft with a long stroke of 29 mm.

This is a new version in which there is improved a big-end bearing is mounted. In addition, the connecting rod is annealed so that there is greater stability at high temperatures and high speeds.

Fits all engines in our product range except for the G320. Please note, only applies in those engines where the cylinder is adjusted proportionately to work. This may be by means of to increment the cylinder with foot gaskets.