On May 15, 10:02 am, Newps wrote:
The engine is not designed to turn in a specific direction. Some
accessories are, such as mags, vacuum pumps, starter, alternator. The
engine itself will happily run in the other direction, several twins do
just that.

That backward-running engine has a different camshaft, mags and
oil pump to allow it to run that way. Engines won't run backwards just
because we try to start them backwards. The intake/compression/power/
exhaust strokes MUST happen in that order, and a backward-turned
engine has them all messed up.

Dan