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yfz 450 carb problems/tuning


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i yave a 05 yfz 450 quad it has a boyesen fuel pump quick shot 1 180 main jet 45 pilot jet, its got a ajustable mixture screw in float bowl, needle non ajustable i belive its a gytr jet kit, not starting when hot flames popin out the exhaust, backfireing as well, dyna fs ecu tryed mixture screw at 2 turns exhaust glowed fead 2 leen i belived! 2.5 turns runs better but still has issues! please help me cheers:bonk:

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