Just bought a new Willy's 604 crate motor carburetor. I put it on and it ran great out of the box. Even before I put this carb on the last couple of races, the motor had a pop in the right exhaust when you get out of the throttle. It only pops one time. It doesn't have any problem under power. It only does it soon as you get off the gas. It has been doing it the last couple of races. I thought I saw a flame out the header when he was on the track going into turn 1 and letting off. What can cause this? Leaking header gasket? Bad valve spring? I'm scared to run it till I can find the problem.
Thanks,
Zoom45
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