Decel backfireing on big inch motor

Discussion in 'Custom Models' started by zoo-mon, May 25, 2009.

  1. zoo-mon

    zoo-mon Member

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    121" TPE motor, 45mm mikuni carb, supertrap exhaust, I can't seem to find any way to stop the backfireing on decel. I have changed the pipes, adjusted the main jet, and the pilot air screw. What cause's backfireing anyway?
     
  2. zoo-mon

    zoo-mon Member

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    Disc system? The baffles are in. would be a major job to remove or change out.
     
  3. zoo-mon

    zoo-mon Member

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    It is a normal one and spotwelded in very tight.
     
  4. zoo-mon

    zoo-mon Member

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    I have a mikuni tuning manual. I think the afterburn is some if not all of it. I will try the next size smaller jet. Then see what that does. Thanks Hobbit
     
  5. zoo-mon

    zoo-mon Member

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    Found it. The throtle stop start wasn't set right. The start was holding the slide open. When the throtle was released the slide didn't shut all the way allowing fuel to flow at deceal. After a lil adjustment. no problem. No nead to rejet. Thanks for the info it caused me to look at it closer.