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Decel backfireing on big inch motor

zoo-mon

Member
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?
 
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
 
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.
 
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