TM 5-3740-214-14
Table 4-3. Troubleshooting Chart (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. ENGINE LACKS POWER
Step 1. Adjust carburetor needle valves.
Figure 4-50. Carburetor
a. Turn both needle valves all the way. to the right (clockwise) until they gently touch
bottom.
b. Turn main fuel needle valve to the left (counterclockwise) two full turns.
c. Turn idle needle valve to the left (counterclockwise) 1-1/4 turns.
d. Start the engine.
(1) If engine runs correctly, the problem is solved.
(2) If engine still lacks power, go to step 2.
(3) If engine does not start, go to step 2.
e. Adjust carburetor while the engine is running.
(1) Turn main fuel needle valve to the right (clockwise) until the engine slows
down.
(2) Turn main fuel needle valve back to the left (counterclockwise) until the
engine slows down.
(3) Turn main fuel needle valve back to the right to a position halfway between
the slow down points.
4-45
