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Old Feb 06, 2013, 07:05 PM
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Team 3DHS / Team JR
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United States, TN, Knoxville
Joined Apr 2010
4,531 Posts
Not the ignition....all ignitions spark when a magnet passes the hall sensor....they can not sense direction. It's in the intake/exhaust/spark timing combination...that particular engine happens to bounce off of the compression stroke on flips where it did not start.....and it fires on the "return" as it bounces through the compression stroke.....then it keeps going. Engines with less spark advance and not extremely aggressive intake/exhaust port timing have all of the "action" close enough to TDC that they will indeed run in reverse.....not as much performance in reverse of course...but it will run. Typically just getting the throttle in the "right" spot minimizes the problem.....but today I was starting with fresh radio programming.....

After the first real start, it was easy to zone in on the proper "idle" epa and then I was in fine shape for the rest of the afternoon....but that first time was interesting today...
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