Saturday, August 13, 2011

In the last year I gave zuma 50 to my wife. She immediately got to work and bought an athena70 kit.
Laid the bike over and took off the old cylinder.

Removed the circlip.

Inspected the piston.

Put on piston ring on new piston.

Slid new cylinder on the engine.

Torqued head down.

The exhaust port matched the expansion chamber. Tuning stayed spot on.

Other tuning notes. The clutch springs had to be softened. stock is pretty close to perfect.  Running a stock variator with about 24 grams of weight and a heavy contra spring. It runs pretty good.