What size are Harley spark plugs?

Use an 11/16″ spark plug socket to unscrew the spark plug by turning in a counter-clockwise direction. Some aftermarket spark plugs that fit the Sportster use a slightly larger 18mm spark plug socket. Remove the spark plug from the cylinder.

How many spark plugs does a Harley Sportster have?

Four spark plugs
Four spark plugs total. The two spark plugs on the left side of the motorcycle are easily accessible. They are basically in the same position that they have always been. However, to access the two spark plugs on the right side of the motorcycle, you will have to completely remove the fuel tank from the motorcycle.

How often should spark plugs be changed on a Harley?

The spark plugs in the motorcycle should be replaced every 8000 miles to 10,000 miles (13,000 to 16,000 kilometres). In addition, the spark plugs need to be checked every 4000 to 5000 miles (6500 to 8000 kilometres) traveled. Most spark plugs usually have a lifespan of 10,000 miles.

What is the spark plug gap on a Harley Davidson?

Most Harley models with electronic ignition call for a range of 0.38 to 0.42 (0.40 average) gap, but consult your owners manual for your specific model.

Do you have to gauge new spark plugs?

Do Spark Plugs Always Have to Be Gapped? Not always. In the past, it was necessary to gap spark plugs, but today spark plugs are usually pre-gapped. It is advisable to double check that the gap is correctly set to the vehicle’s recommended setting when installing spark plugs.

What thread is a Harley spark plug?

One of the most common sizes for Harley Davidson motorcycles is; metric – M12x1. 25 millimeters. If that’s what your motorcycle uses, the kit will be the Time Sert 4212.

What is the torque spec for spark plugs?

SPARK PLUG Installation

Thread Size Recommended Torque Recommended Tightening Angle
New Plug
M14 20-30N・m About 1/2 turn
M14 20-30N・m About 2/3 turn
M18 30-40N・m About 1/4 turn

What color should my Harley spark plugs be?

Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Rich running conditions: If your engine is running too rich, the spark plug will be black and sooty.