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General Moto | Off-Topic Posts
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[QUOTE="dirt bike dave, post: 1311138, member: 18302"] The pistons go up and down together, but they don't fire together (one is on the compression stroke and one is on the exhaust stroke). This gives very equally spaced power pulses, but is mechanically unbalanced, and could vibrate like a big single cylinder. It was fairly common on the old vertical twins, but others were also 180* opposite (one piston up and one down). If you want a weird engine config, there is something known as a 'twingle'. Two pistons going up and down together, and sharing a single combustion chamber. Mostly found on two strokes. [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
Ol89r's home movies
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