6-33
WARNING
Many troubleshooting procedures present hazards that can result in severe personal inju-
ry or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery haz-
ards should perform service procedures. Review safety precautions on page iii.
TABLE 6-16. TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
Trouble Possible Cause Corrective Action Section/
Page
Engine 1. Rich fuel mixture due to: 1a. Adjust carburetor main and idle 8-14
Backfires a. Incorrectly adjusted fuel mixture screws.
Through adjustment screws. 1b. Check choke assembly. 8-17
Muffler When b. Choke sticking or out of adjustment.
Running c. Restricted air filter (LPG models). 1c. Replace air filter. 8-11
2. Mechanical engine defect 2. Perform Leak Down Test. 10-1
(exhaust valve defect).
3. Faulty ignition due to: 3. Reset spark plug gap.
Incorrect spark plug gap.
Engine Lacks 1. Dirty air filter. 1. Replace air filter. 8-11
Power
2. Restricted fuel flow due to:
a. Plugged fuel filter or 2a. Replace fuel filter. 8-19
b. Faulty fuel pump 2b. Test fuel pump and replace if faulty. 8-19
c. LPG - regulator or fuel solenoid 2c. Refer to LPG Fuel System, section 8.
dirty or defective.
3. Exhaust system blocked or restricted. 3. Locate and remove blockage, clean
spark arrester screen.
4.Carburetor air preheater set incorrectly. 4. Check automatic preheater setting. 8-11
5. No load speed set too low. 5 . Adjust governor setting. 8-9
6. Incorrect fuel mixture due to:
a. Incorrectly adjusted fuel 6a. Adjust carburetor main and idle 8-14
mixture screws. adjustment screws.
b. Dirt or varnish in carburetor. 6b. Disassemble carburetor and clean 8-15
all internal passages.
7. Incorrect valve lifter clearance or 7. Adjust valve clearance, if problem 10-7
defective valve. continues inspect valves.
8. Excessive engine wear. 8. Perform Leak Down Test. 10-1
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