The G4 uses an idle control valve to monitor and maintain the idle speed. I would be looking there to see if there's any issues with the operation of that or the air lines with the throttlebodies.
What mods are done to the bike? Does it sit outside? It may be water or crap in the fuel that needs to removed. And how do you know that it's misfiring instead of stumbling at low RPM like that? Poor running due to a fueling issue may feel and sound like an ignition misfire, but it's just a general stumble in the motor.
What mods are done to the bike? Does it sit outside? It may be water or crap in the fuel that needs to removed. And how do you know that it's misfiring instead of stumbling at low RPM like that? Poor running due to a fueling issue may feel and sound like an ignition misfire, but it's just a general stumble in the motor.