Harley Davidson Touring Models 84-98 FLH, FLHT, FXR. Service manual — page 3

TROUBLESHOOTING

Diagnosing mechanical problems is relatively simple if an orderly procedure is used. The first step in any troubleshooting procedure is to define the symptoms closely and then localize the problem. Subsequent steps involve testing and analyzing those areas that could cause the symptoms. A haphazard approach may eventually solve the problem, but it can be very costly with wasted time and unnecessary parts replacement.

Proper lubrication, maintenance and periodic tune-ups as described in Chapter Three will reduce the necessity for troubleshooting. Even with the best of care, however, the motorcycle may require troubleshooting.

Never assume anything; do not overlook the obvious. If the engine will not start, the engine stop switch or start button may be shorted out or damaged. When trying to start the engine, it may be flooded.

If the engine suddenly quits, consider the easiest, most accessible system first. If the engine sounded as if it ran out of fuel, make sure there is fuel in the tank and that it is reaching the carburetor. On carbureted models, make sure the fuel shutoff valve is turned on.

If a quick check does not reveal the problem, proceed with one of the troubleshooting procedures described in this chapter. Gather as many symptoms as possible to determine where to start. For example, note whether the en-
gine lost power gradually or all at once, what color came from the exhaust, etc.

After defining the symptoms, follow the procedure that most closely relates to the condition(s). Guessing at the cause of the problem might provide a solution, but it can easily lead to wasted time and unnecessary parts replacement.

Expensive equipment or complicated test gear is not required to determine whether repairs can be attempted at home. A few simple checks could save a large repair bill and lost time while the motorcycle sits in a dealership service department. On the other hand, be realistic and do not attempt repairs beyond personal capabilities. Dealership service departments tend to charge heavily when working on equipment that has been abused. Some will not even take on such a job. Use common sense to avoid getting involved in a procedure that cannot be completed satisfactorily. If referring troubleshooting to a repair facility, describe problems accurately and fully.

Table 1 and Table 2 list electrical specifications. Tables 1-4 are located at the end of this chapter.

ENGINE PRINCIPLES

Figure 1 explains the basic four-stroke engine operation. This information is helpful when troubleshooting or repairing the engine.

draw is low, suspect an undercharged battery or an open circuit in the starting circuit.