CY Stuffed Crankshaft

To install CY Full Circle and CY Stuffed Crank into Zenoah 23/26cc marine engine. Oil the new crank with light machine oil, insert into the front of the Zen crankcase, rotate the crank and feel if there are any scoring or very light scrapping. If yes use a dremel or a light sand paper and use your fingers to rub down the crankcase. This is to ensure there will be no additional friction.

While you are at might as well upgrade your ball race to a ceramic high speed and high temp version.

CY Full Circle Crankshaft