Table 4-2. Unit Troubleshooting (Cont).
Engine lacks power (Cont).
Compressed air used for cleaning
or drying purposes, or for clearing
restrictions, should never exceed
30 psi (207 kPa). Wear protective
clothing (goggles/shield, gloves,
etc.) and use caution to avoid lnju-
ry to personnel.
Use care not to scratch or damage
piston or cylinder walls when re-
g. Exhaust ports are clogged.
g. Remove muffler (see paragraph
8-2) and rotate engine until piston
is at bottom of cylinder. Using
scraper, remove carbon from ex-
haust ports and clear with com-
pressed air. Start engine (see
paragraph 2-4) and run briefly to
remove all carbon. Install muffler
(see paragraph 8-2).
h. Ignition is faulty.
h. Check ignition wiring and coil
and replace as necessary (see
5. Engine stalls under load.
a. Carburetor main adjustment is
a. Adjust carburetor (see paragraph
b. Fuel line is restricted.
b. Remove fuel line (see paragraph
7-6) and clear restriction, Re-
place fuel line as necessary (see
6. Engine misses.
a. Sparkplug is defective or fouled.
a. Replace spark plug (see para-
b. Spark plug gap is out of adjust-
b. Clean spark plug points and set
gap at 0.040 in. (1.02 mm)