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This is another Kerzel engine built from plans made available by the designer, Mr. Kerzel. It has a bore of about 3/4 inch and a stroke of almost an inch. It is running on propane.

I was having trouble with the transistor ignition circuit with a hall sensor on my still-in-progress Kerzel Engine. After 5 or more good ignition sparks, the circuit shut down. If I shut off the power to the board, then turned it back on, the same thing would happen. After switching parts...

I needed some music wire for making springs for the Kerzel hit-and-miss engine that I am building. The plans called for wire measuring 0.010 inches in diameter for winding the springs on the regulator. The smallest I could find at the hardware store was 0.015 inches. Not wanting to spend $20...