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Old 06-13-2013 | 04:53 PM
  #8758  
noddy2
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Joined: Aug 2010
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From: North Queensland
Default Engine Backfire
Originally Posted by JourneyMan
More strange behavior coming from this motor. Still working on the break-in process and last night it decided it wanted to fire backwards. It is very consistent, fires backwards about every other start. That backfire that I mentioned in an earlier post, I believe was the start of this. It backfires and then runs in reverse. Ron- I know this is common of 2-strokes in MX and that orientation doesn't matter, but is this a bad sign during run-in?
A Backfire can can cause problems !
High Internal pressure can blow the Front Bearing Seal out of the race .
It can also Damage the 'O Ring' that seals the Carby near the pinch bolt .and loosen any sealant that hes been applied .

Backfire during run in can occur if over fueled ,ie excess fuel in crank case ,
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