no it will not remove any back firing I never faced back firing in my CG... even though every thing is stock.... can you elaborate when it back fires ?
Mostly back fire happen if the
1 - Plug is Bad,
2 - CDI has a fault
3 - Valves are not tuned to specs (its OK to lose them)
4 - The timing is out (happens if the engine is recently rebuilt and assembled back with timing little out of where it should be and can be checked with AHL proprietary Timing Light fo CG-125)
or are you talking about the Gun Fire
sound which these EuroII CG makes that happens if you switch of ur CG on high REV and turn it back on... "Kaboom"