Quote:
Originally Posted by Occasionally6
It might be interesting to investigate what combination of ignition and exhaust valve timing defines the limits before there would be a possibility of the firing cylinder trying to turn the engine backwards.
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I assume you're talking about 4-stroke engines, but 2-stroke engines are pretty easy to get running in the 'wrong' direction. A buddy of mine kick-started a 2-stroke Saab backwards once upon a time, and ended up with 4 reverse speeds and 1 forward!
![EEK!](/forum/images/smilies/eek.gif)