"I have a 1969 Chrysler Marine
"I have a 1969 Chrysler Marine 318 with a Carter AFB carburetor in a '69 Correct Craft Barracuda.
The boat has developed a backfiring problem above 2600-2700 rpms. Idle is smooth and even, acceleration is good up to 2400-2500 rpms. Above that there is a constant "pop" and although acceleration is not great, the boat continues to accelerate. The carb has been adjusted at idle and the plugs seem to be burning acceptably (With the exception of # 6 which seems to be gettiong fuel, I can smell gas, but is perfectly clean. The points/condenser has been changed over to a Pertronix electronic ignition recently, the backfiring was worse prior. Plugs are new.
I have tried to power time under load to eliminate the backfiring to no avail. Any suggestions?
Any idea how the By-pass idle air adhustment screw is supposed to be adjusted?"
"I have a 1969 Chrysler Marine 318 with a Carter AFB carburetor in a '69 Correct Craft Barracuda.
The boat has developed a backfiring problem above 2600-2700 rpms. Idle is smooth and even, acceleration is good up to 2400-2500 rpms. Above that there is a constant "pop" and although acceleration is not great, the boat continues to accelerate. The carb has been adjusted at idle and the plugs seem to be burning acceptably (With the exception of # 6 which seems to be gettiong fuel, I can smell gas, but is perfectly clean. The points/condenser has been changed over to a Pertronix electronic ignition recently, the backfiring was worse prior. Plugs are new.
I have tried to power time under load to eliminate the backfiring to no avail. Any suggestions?
Any idea how the By-pass idle air adhustment screw is supposed to be adjusted?"
