Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
03-02-4 MMR2000_116_03_02A.FM
SYMPTOM IRREGULAR ENGINE IDLE.
CONDITION NORMAL USE AFTER ENGINE WARM UP.
Test/Inspection 1. Check choke.
a. Choke plate may be partially closed.
Readjust.
2. Check pilot screw position.
a. Inadequate fuel/air mixture.
Adjust according to specifications (refer to TECHNICAL DATA 10).
3. Check ignition system coil air gap.
a. Air gap is too large.
Adjust according to specifications (refer to TECHNICAL DATA 10).
4. Check dimension of main jet.
a. Inadequate fuel/air mixture.
Adjust according to specifications (refer to TECHNICAL DATA 10).
5. Check engine compression.
a. Insufficient engine compression.
Check valve clearance; carbon accumulation; defective cylinder head gasket,
valves or valve seats.
Check for worn piston rings, piston or cylinder. Replace defective part(s)
(ex.: piston(s), ring(s), etc.).
SYMPTOM HIGH ENGINE OPERATING TEMPERATURE.
CONDITION NORMAL USE.
Test/Inspection 1. Check cooling fins of engine.
a. Dirt accumulation between engine fins.
Clean thoroughly.
2. Check carburetion.
a. Improperly adjusted or inadequate carburetor components.
Adjust according to specifications (refer to TECHNICAL DATA 10) or replace
inadequate component(s).
3. Check cylinder head gasket.
a. Worn gasket.
Replace.
4. Check condition and heat range of spark plug.
a. Melted spark plug tip or inadequate heat range.
Replace.
5. Check exhaust condition.
a. Carbon deposit.
Clean.
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