OK i have a novarossi plus 4c and a novarossi fms "team". when i come in for a pit stop and fuel it up with a bottle and throw it back out it will run fine until the first corner and then flame out. i know it is richening up drmatically because when i start it up again i have to clear it out. i am running the fms in my truggy and the plus 4 in my buggy. both mugens with a clunk modification and the tank is 100% sealed...im sure of that. i was told that the low end may be too rich but if i lean the low it will not run the way i expect it to. both of these motors will idle through a whoile tank if i let them so i know the tune is very close. seems to me if the low speed needle is the cause then it must be off tune quite a bit......Please anyone and everyone give your input. btw both of these motors are in immaculate condition as far as the internals. boths have been reworked by mr houston himself with the help of raya racing resizing about a gallon ago.