Bonneville America Forums Forums Technical Forums General Tech Backfiring.

Ok, you all know I'm new to this stuff, so please pardon the ineptitude

The previous owner of my Speedy put aftermarket pipes on (don't know what kind) and a FREAK airbox removal. All cool, but I get the occasional backfiring. Is this normal? It's not that often... Just once in a while when I let off the gas completely and suddenly. Also, I get one once in a while when I start it. Seems to only happen on one side (right).

Any suggestions for the clueless?

Are you talking about a bunch of little rapid pops on deceleration? That may just indicate a lean pilot circuit, and only require backing out on the pilot screws a little bit.
If it's a big bang when starting it up, make sure you don't twist the throttle while starting it.

Only in the morning if I full choke my bike it will give a really good pop-and seems to come out of the right side only too. If I half choke it no pop. Mine doesn't do it with decel. Is it possible we both have lean pilot screws on the right??

I do get the little pops on decel. I also get a LOUD pop sometimes. Not usually on cold starting... that happened once, but I get it when letting off the gas and pulling in the clutch after a sustained period of speed (say, downshifting for an offramp on the highway).

Mine did exactly the same,mostly on the right side as well.
I turned out the mixture screw a little at a time till I got rid of the big pops. I now have the ocasional pop but its more of a rumble on decel.
Sometimes I now get stereo pops(thats cool ).

Turn your mixture screw out a 1/8th of a turn out on the right side,that will probably improve it,just keep an eye on your plugs to make sure you dont get too rich.