Who owns a Cobra 2000fi? What are your pot settings and what intake/Exhaust do you run? Just curious.
All right >>>>Top back of air cleaner there is a hose (AIR SWITCHING VALVE HOSE THAT GOES TO YOUR EXHAUST PIPES SENDS AIR AT DECELERATION TO FIRE ANY UN BURNED FUEL >HENCE BACK FIRE/POPPING.)PUT A PLUG IN THAT HOSE ANYTHING WILL WORK OLD USED CONDOM, MARBLE, PAPER RUBBER ETC YOU ARE JUST BLOCKING AIR INLET, be sure to put the hose back on the air cleaner if you have a after market air cleaner same principle applies.
NOW> Exhaust port leak.. start your engine warm to normal operating temp the shut it down tighten the 12mm acorn nuts. To check for leaks (MESSY) START ENGINE SQUIRT WD40 ON PORTS WHILE RUNNING IF IT BUBBLES OR SPITS ON YOU YOU HAVE A LEAK ..REPLACE EXHAUST GASKETS >>>>>>>CLASS DISMISSED<<<<<<<<
I agree. Thanks Bare. You're the man!!!