Posted by Centex Farmall on September 20, 2014 at 21:47:02 from (72.105.165.95):
In Reply to: MD question from below posted by Joshua Rod on September 20, 2014 at 19:10:34:
The head has three valves. Intake and exhaust like usual and then a small valve that goes to an extra chamber where the spark plug is. When those valves are open, the compression ratio drops making gasoline operation possible. Those valves are controlled by the lever on the side and either stay open or closed. The intake also has a butterfly valve that closes off the main intake when on gas. It forces air to go through a different circuit that includes the carb. There's no throttle control on gas, it runs a steady fast idle.
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