> How many cylinders? =A0Rember that only half fire in any one revolution, =
at
> least if this is a two stroke gasoline engine.

Not always true.

The VW Bug engine is four stroke.

My Ford triton engine uses a technique called "wasted spark" that
fires every piston on both the compression and the exhaust strokes.
It's also popular in aircraft, but I don't know if this applies to the
bug engine in particular.

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