On Thu, 10 Dec 2015 19:40:30 +0000 (UTC), David Lesher
wrote:

Tim Wescott writes:


Weed-whacker and chainsaw motors are, to my knowledge, piston timed, with
the intake port to the crankshaft opened and closed by the skirt of the
piston rather than by the crank or a rotor attached to the crank. So,
they'll run pretty much the same in either direction, once you get the
spark timing sorted out.

The classic 3 cylinder 2-cycle Saab 95 would run either way. Car Talk
once had a Puzzler on how one could beat a muscle car in a drag race.
The answer was "backwards..." as the Saab could be started the other
way and have 4-speeds of reverse...

In my novice race at Lime Rock Park, in the late '60s, I got stuck
behind a Saab 93 that had been race-tuned (squared ports, etc.). His
secret weapon was that he smoked out anyone who tried to pass him.

--
Ed Huntress