Although the engines that power motorcycles, boats, and lawn and garden equipment are usually smaller than those that power automobiles and trucks, they have many things in common, including breakdowns. Motorcycle, boat, and small-engine mechanics repair and service power equipment ranging from chain saws to yachts. Small engines, like larger engines, require periodic servicing to minimize the possibility of breakdowns and keep them operating at peak efficiency. At routine intervals, mechanics adjust, clean, lubricate, and, when necessary, replace worn or defective parts such as spark plugs, ignition points, valves, and carburetors.
Routine maintenance is normally a major part of the mechanic's work.
When breakdowns occur, mechanics diagnose the cause and repair or replace the faulty parts. The mark of a skilled mechanic is the ability to diagnose mechanical, fuel, and electrical problems and to make repairs in a minimum amount of time. A quick and accurate diagnosis requires problem-solving ability as well as a thorough knowledge of the equipment's operation. The mechanic first obtains a description of the symptoms of the problem from the owner, and then, if possible, operates the equipment to observe the symptoms. The mechanic may have to use special diagnostic testing equipment and disassemble some components for further examination.