[Duck Down]

I have just put Hard Krome 2 into 1 Sideburners on and Fi2000 Powr Pro on. I now get a back fire when letting off and popping. Have already done the Pair Valve Mod. Any and all advice is appreciated. Thank you in advance for your help. :banghead:

 

[Good Old Rebel]

Did you install new exhaust gaskets? If not, you may have a exhaust leak at the manifold. If you used new gaskets you may not have torqued them down tight. To check, start the bike in neutral, hold a flame near each gasket, moving it around the outside circumference of the exhaust clamp. If the flame flickers, you may have a leak. Tighten or replace.

Rebel

 

[wanderingbear]

Isn't that suppsed to be a self adjusting fuel control. It sounds like a fuel adjustment is in order though. Can you map it yourself or have it dyno'd. I'd go with the dyno to have it set the right way.