billyd21970

i have a 13 to1 406.i have a brodex intake and bow tie heads with 208.im running a 618 roller cam.with a quick fuel 850.its all new and first got it running it was running fine.but after the 6th pass it has started running rich and burning my eyes.any help fixxing it.

coloradoracerguy

What is your fuel pressure set at? Where are your floats set at? Do you have fuel coming out of the boosters while idling? What are the idle mixture screw set at? What is your initial timing? Need to know more about setup before we can help. Lots of things can cause that to happen.

billyd21970

fuel pressure is set at 7 1/2,floats are set at the bottom of the sight holes,no fuel coming out the boosters,the fuel mixture screws are set at 2 turns out both front and rear.timing at 36.

TS1955

Does your carb have a power valve?

TS1955

coloradoracerguy

IMHO, I think your mixture screws are too far out. They should be between 1-1 1/2 turns. How much transfer slot is showing on your combo? Do you know what air bleeds you have in it? Idle feed restrictions?

billyd21970

i have tried them at 1 to 1 1/2 to 2 to 2 1/2 turn. and it does have a power valve.it a number 4.not sure how to check it if it bad.

coloradoracerguy

How does it respond when you change the mixture screws? You might have a pv issue. Pull it out, and try to blow through the flat part. If you can blow through it, it's bad. Gonna taste like crap though...... :shock:

billyd21970

ill try that now.i have it apart.so it taste as good as it smells?lol

billyd21970

i tried to blow throw it and nothing.

billyd21970

the pv 4.5 and the front jets are 78 and rear are 84..