Also, I'm having a tuning issue. I'm at 5500 ft elevation. My 660 has 10.75 compression big gun exhaust, stage 1 hotcam and .5 inch carb space, no airbus high output coil and rev box. I can get this captor running great at low end. Plenty of torque and then it starts to die off and finally POP with loss of power. I have tried many different clip positions with many different jets. I even tried a bigger pilot jet. Pilot didn't make a difference of course so 22.5 is back in. I'm at 180 and 185 on jets. It seems to have cotton a little better but still has top end popping. I've tried different settings on the mixture screws to. I'm stuck. Carb are clean, no damage, diaphragms are good and floats float.