Why is my Harley running lean?
If a motorcycle is running lean, that means there’s too much air and not enough fuel in the air/fuel mixture in the combustion process.
How do you adjust the air fuel mixture on a Harley Davidson?
Locate the idle mixture screw on the bottom outlet side of the carburetor, in a passageway next to the float bowl. Turning the idle mixture screw in, or clockwise, will lean the idle mixture and turning it out, or counterclockwise, will enrich it.
What should I use to diagnose lean running engine?
Use only high-quality, low-lint air filters, and beware of aftermarket filter housings or “tornado” devices which may disrupt the laminar airflow required for accurate MAF sensor performance. Also, be sure to check the MAF sensor’s wiring.
How often should you adjust the idle mixture on a Harley?
Adjust the screw 1/2 turn at a time. After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments. Stick with the 1/2 to 1/4 turn rule. Often the smallest adjustment is all that is needed.
What happens if you mix oxyacetylene with lean running engine?
The composition and relative abundance of other exhaust gases changes as well. Your experience with an oxyacetylene cutting torch is a good analogy. Too lean a mixture will result in popping or a misfire; too rich a mix produces sooty smoke and a flame that won’t cut. For proper torch operation, you need a proper mixture.
Use only high-quality, low-lint air filters, and beware of aftermarket filter housings or “tornado” devices which may disrupt the laminar airflow required for accurate MAF sensor performance. Also, be sure to check the MAF sensor’s wiring.
Adjust the screw 1/2 turn at a time. After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments. Stick with the 1/2 to 1/4 turn rule. Often the smallest adjustment is all that is needed.
The composition and relative abundance of other exhaust gases changes as well. Your experience with an oxyacetylene cutting torch is a good analogy. Too lean a mixture will result in popping or a misfire; too rich a mix produces sooty smoke and a flame that won’t cut. For proper torch operation, you need a proper mixture.