Section 02 TROUBLESHOOTING
Subsection 01 (ENGINE)
SYMPTOM ENGINE PINGING.
CONDITION NORMAL USE.
1. Check for proper fuel octane number according to engine type.
a. Too low fuel octane number.
Use appropriate fuel octane number (Refer to Operator's Guide).
2. Check fuel lines.
a. Bent fuel lines (preventing fuel from flowing through).
Relocate or replace fuel lines.
3. Check if carburetor(s) is (are) clean.
a. Dirt prevents fuel from flowing through.
Clean.
4. Check ignition timing.
a. Timing is too advanced.
Adjust according to specifications (refer to TECHNICAL DATA).
5. Check compression ratio.
a. Compression ratio is too high.
Replace inadequate part(s) to obtain manufacturer’s recommended compression ratio or use a higher
grade fuel.
TEST/INSPECTION
6. Check for carbon accumulation in combustion chamber and/or on piston dome.
a. Carbon accumulation.
Remove carbon accumulation.
SYMPTOM ENGINE GENERATES A LOT OF VIBRATIONS.
CONDITION NORMAL USE.
1. Check engine supports and stopper.
a. Loose and/or broken supports or interference between support(s) and chassis.
Retighten to specification (refer to TECHNICAL DATA) or replace.
2. Check drive pulley.
3. Check carburetor synchronization.
a. Throttle slide height is not the same on each carburetor and/or throttle slides opening is unsynchronized.
Adjust throttle slide heights and throttle cable.
TEST/INSPECTION
4. Check for crankshaft and bearings.
a. Loose crankshaft bearings or uneven crankshaft.
Retighten or replace the parts.
mmr2005-063 19
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