Our perceptions of power are subjective. When the complaint is real, the first priority is to distinguish between the engine and what it drives. The fault may be a dull saw chain, an oil-soaked centrifugal clutch, dragging bearings, or an overtightened belt. If power loss is the fault of the engine, the condition usually develops [...]
Intermittent malfunctions are, almost without exception, confined to the ignition and fuel systems. Test ignition output with the engine running is described under “Spark Output.” If spark persists during coastdown, the problem lies in the fuel system. Suspect a clogged fuel-tank vent (Fig. 2-16) or a sticking carburetor inlet needle. small engine runs 10 minutes,small [...]
That the engine starts at all means that compression and the ignition module are probably okay. But check the compression and, if you have not already done so, replace the spark plug with a known good one. The most likely culprit is insufficient fuel, especially if the engine is of recent vintage. Clean and use [...]
Failure to start with a new spark plug, fuel filter, and a quarter tank of fresh premix can have several causes, most of them obvious. We can pretty well forget about carburetor adjustments (unless someone has jiggered with the carburetor since the engine ran last), carbonized exhaust ports, and other subtleties. Check ignition output as [...]
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