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It is horizontal, air cooled, single cylinder with automatic inlet valve and cam operated exhaust valve. Cylinder head, cylinder fins and valve chamber are made from aluminum alloy. Cylinder it self is from grey cast-iron as well as 2 piston rings of my own construction. I have spent some long hours to get good rings. First problem was to get good quality cast iron. I was trying to follow the Bob Shores method to machine the rings but each time as I heated them up, despite of using holding fixture, they were sealing really poorly..So I choose different procedure -instead of heating opened rings, I have turned rings of a larger diameter then saw a gap with Dremel tool. Then, I simply close the ring and lock it to fixture on the lathe to turn it down to a required diameter. Result is very good.
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