When is it backfiring?  Idle?

White spacer mod is for mid range throttle response.

Backfire occurs at lean throttle conditions.

If backfire occurs at idle, adjust idle circuit.  Not mid range.

it pops when i roll off the throttle, but it doesn't pop in between shifting gears anymore.

i haven't shut it down enough times to tell i just did the mod last night.  


i have a jardine w/ stock air.


how would i go about adjusting the idle circuit?

i thought that was the screw, but i wasn't sure, because last night when i was trying to adjust it.... it didn't seem like it was doing anything.

That would be my question as well, I just picked up a pair of sportster mufflers, for my '08. Trying to figure out which kit (if any) would be best, or if I should just get some different individual jets from mikuni...

Idle adjust, idle adjust hmmm...  Oh yeah!  That's something I've been going to mention.  In all the "backfire" threads, I don't recall anyone saying to turn down the idle to stem the backfire on shutdown.  When my idle is lower, it shuts down nicely.  If it is idling too high, I get quite a bang.  

That would be worth telling folks with a backfire question, unless I'm the only guy it happens to.

The general rule on "Turns out" for the little needle valve on the right side is just a few turns, right? Its only because the spring tension starts to fall off & the thing can vibrate out? IF thats all there is to it, would a spring off a ballpoint pen, cut off a bit, naturally, stuck in there, work out?Might need a light washer at the spring junction, theres some pretty thin, white nylon , found on the bottom of some drawers...just sayin,,

My Dr. uses some really stout magnets, of various thicknesses, all the same diameters. I built her a little doohickey that hangs on her rolling tray, with 3 low spots in it, to set magnets down in, then swing a handle across & strip the magnets off each other. I made it from a nylon cutting board I found in the road. I make stuff outta junk a lot.