Why does my Harley exhaust pop?
When the Harley is backfiring with the stock exhaust system still intact, it might signal the exhaust pipe weakening or the muffler is malfunctioning. During backfires, unburnt fuel goes out through the exhaust valve on deceleration. The fuel ignites and causes the popping sound.
How do I know if my carburetor is too rich or too lean?
If the mixture is too lean, it will leave no color, while a rich mixture will cause the fuel ring to become more prominent. Over-rich mixtures will give the plug a sooty appearance.
Can a vacuum leak cause a CARB to pop?
A vacuum leak can cause what you described. I would get a propane torch and with it unlit of course, check the intake manifold and around the carb for vacuum leaks while the engine is running. If you hear a sudden change in engine idle, thats where the leak is.
What causes exhaust to pop when letting off throttle?
Plugged slow jets not uncommon (and that can cause other major problems. If the bike never did it, sat a long time and started popping, that’s more of a possibility). Incorrect air screw settings can sometimes cause it, I’ve been able to tune it out (or hide it..) with an air screw adjustment in some cases.
Why does my carburetor make a popping noise?
Popping noises from a carburetor indicate a form of backfire. Too much air and not enough fuel causes backfires to occur in the intake manifold. The exploding mixture then vents through the carburetor.
Why does my Eddy 1406 carb keep popping?
I’ve checked the timing and that’s fine, I’ve even swapped carbs (from an Eddy 1406 to a Holley 3310-3), but the popping persists. So I’ve come to the conclusion that this must either be a compression issue or a cam issue, or something else I’m just not thinking of.
A vacuum leak can cause what you described. I would get a propane torch and with it unlit of course, check the intake manifold and around the carb for vacuum leaks while the engine is running. If you hear a sudden change in engine idle, thats where the leak is.
Popping noises from a carburetor indicate a form of backfire. Too much air and not enough fuel causes backfires to occur in the intake manifold. The exploding mixture then vents through the carburetor.
Plugged slow jets not uncommon (and that can cause other major problems. If the bike never did it, sat a long time and started popping, that’s more of a possibility). Incorrect air screw settings can sometimes cause it, I’ve been able to tune it out (or hide it..) with an air screw adjustment in some cases.
I’ve checked the timing and that’s fine, I’ve even swapped carbs (from an Eddy 1406 to a Holley 3310-3), but the popping persists. So I’ve come to the conclusion that this must either be a compression issue or a cam issue, or something else I’m just not thinking of.