Repair 7

Diagnose all engine problems by first reading your spark plugs. Access the spark plugs on the left side of your motorcycle. Remove both front and back spark plugs with a spark plug socket and a socket wrench and examine them. If the electrodes are intact and light gray to pale tan, your fuel-air mixture is fine. Reinstall your old plugs. If the electrodes are visibly corroded, your fuel-air mixture is too lean. Replace the old plugs with new ones. If your plugs are visibly sooty, your engine is running too cold or too rich, because you are making too many short trips or because your fuel-air mixture has too much gasoline and not enough air. Replace the plugs with new ones.

Inspect your spark plug wires and their connections to the coil and your spark plugs. Plug wires are not moving parts, so they do not usually wear out. If you see visible signs of wear, though, replace them.

Adjust the idling speed on a carbureted Ultra by using a small, flat-head screwdriver to turn the adjustment screw on top of the carburetor by the throttle cam. If you have trouble finding the throttle cam, stare at your carburetor while you twist your throttle. It is the part that moves. Adjust the fuel-air mixture on a carbureted Ultra by turning the fuel-air mixture screw on the bottom of your carburetor. The correct adjustment should be between two-and-an-eighth or two-and-a-quarter turns out.

Adjust both the idling speed and fuel-air mixture on a fuel-injected Ultra by using a Screaming Eagle Race Tuner, which is usually called a SERT, or equivalent, and a laptop computer. The SERT comes with software you install on your computer and cables that connect your laptop to a pigtail connection next to the electronic control module behind the side cover. Remove the seat screw behind the seat with an Allen wrench, then remove the seat to gain access to this pigtail connection.

Pull the hood release lever under the drivers side of the dashboard. Open and secure the hood of the truck. Then, locate the batteries. Youll notice two batteries sitting to the right of the engine, but only the battery closest to the engine connects to it. This is the one that needs to be disconnected.

Use a flathead screwdriver to pry off the black cover on the negative battery terminal. Using a wrench, loosen the nut attached to the clamp. Then, pull the negative battery cable from the post. Set it to the side where it wont touch anything metal.

Using a flathead screwdriver, take the red cover off the positive battery terminal. Use a wrench to loosen the nut that holds the clamp in place. Then, pull the positive battery cable from the post. Put it to the side and make sure it wont come in contact with anything metal.