I have a 2001 sportsman 500 h.o I reach 30 mph and it flutters like gas starvation I have done top end I have done the cam head cdi with a dc cdi has good power just till mid 3/4throttke then nothing have to feather gas to get faster swapped carb jetted it idk check everything vacuum Idk if it’s the wrong carb for the h.o ordered that one the side going into head was to big got a reg 500 carb fit but has little smaller intake port could This be any suggestions would be nice