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