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Hi, yesterday i adjast my motorcycle (gsxr600 - 2002) with a carburetors accurately synchronized.
today i drive and hear backfire everytime i slow down...
when i turn down the gear, i hear backfire, only in low rpm.
can u help me with that?
thank you.
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This is a common problem due to the carburetor being jetted so lean. The carburetor is jetted very lean so that it will meet the EPA emission regulations. If you go up one size on the slow jet and readjust the idle mixture, this should help. The removal and disassembly of the carburetor is required to do these modifications.
It could be the speed of one carburetor is faster than the other. This causes the backfiring as well as forces one cylinder to run lean which causes the tapping noise. You will experience an identical tapping or "ping" when you get close to empty on main fuel and need to switch to reserve. Most likely you or the previous owner unknowingly adjusted the speed of the rear carburetor down because of the high stock idle not realizing the front carburetor needs to be slowed down to match. While running simply turn the idle adjust screw clockwise on the rear carburetor until the idle smooths out and the backfiring/tapping stops.
The backfiring won't harm anything, it is just annoying. You can reduce the backfiring on deceleration to a minimum - or maybe eliminate it completely - by having the carburetors synchronized.
To be safe, you are probably going to be better off in the long run if you put the arrestor plates back in. Not just from a noise level concern but also because this modification may cause your allready lean-running engine to run even leaner. This can cause driveability problems in cold weather and perhaps a slight reduction in engine life.
your idle mixture is too lean, meaning that when your not on the throttle, your engine isnt getting enough fuel, and just a bit too much air. there is a screw to adjust this on the carburetor, on the bottom, right in front of the bowl.it may be tricky getting a small screwdriver in there to turn it though. but i would turn it out about 1/2 turn at a time untill your backfiring goes away. if that doesnt solve it, then you may just need to clean the carburetor, and repeat the process.
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