Click on images to view them in larger size.

Page6 Piston and Contra-Piston

Piston and contra-piston is simple in the form, but severe in the outer diameter.

I made two laps, one for inner side of the cylinder and the other for outer side of the piston.
First I do the lapping for inner side of the cylinder.
Then lap the outer side of the piston just fit to the cylinder.

Full member of the parts that I have made waiting for assembling and running.











Cylinder, prop driver and fuel cap are stained in blue(About the process, I do not know what I say in English, anodize?)









Accomplished!
Test run now.