PlasticHero
Senior Airman
I got this back in the 80's and has been trouble free until recently. It would have difficulty starting and staying in motion if the air wasn't being used. I started with taking the head off, but I don't think the problem was there. The "cylinder" is about 3 inches in diameter, but the stroke is only about 1/4 inch. There are no piston rings, there is a rubber gasket that holds the piston in place as it goes. There are flapper valves to let the air in and out. I didn't take any pictures, because I didn't think to share this until it was all back together. The easy part to check is the crank; I put a drop of needlejuice I got to lubricate my airbrush on the parts of the crank end. Started it up and it ran much smoother and could run easily while not using air. Total time, 20 minutes but adding lube would only have been 5.
