TM 5-3740-214-14
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE LACKS POWER (Continued)
Figure 5-116. Carburetor Needle Valve Removal
a.
Remove the main fuel needle valve and idle fuel needle valve and check them for damage and
plugging.
(1)
If the needle valves are okay, go to Step 1d.
CAUTION
DO NOT use hard metal objects to unplug the needle valves. Hard metal objects will damage
them.
(2)
If the needles are plugged or gummed up, rinse them in alcohol or acetone and return them to
the carburetor. Go to Step 1b.
(3)
If the needles are damaged and cannot be repaired, replace them and go to Step 1b.
b.
Adjust the needle valves.
(1)
Turn both needle valves all the way to the right (clockwise) until they gently touch bottom.
(2)
Turn the main fuel needle valve to the left (counterclockwise) two full turns.
(3)
Turn the idle needle valve to the left (counterclockwise) 1-1/4 turns.
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