MVH-402GHB —TROUBLESHOOTING
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, please take a remedial action following thediagnosis based on the Engine Troubleshooting (Table 8) information shown below and on the proceeding pages. If the problem cannot be remedied, please leave the unit just as it is and consult our company's business office or service plant.
TABLE 8. ENGINE TROUBLESHOOTING
SYMPTOM | POSSIBLE CAUSE | SOLUTION | |
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| Spark plug bridging? | Check gap, insulation or replace spark plug. | |
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Difficult to start, "fuel is available, but no | Carbon deposit on spark plug? | Clean or replace spark plug. | |
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SPARK at spark plug". | Short circuit due to deficient spark plug | Check spark plug insulation, replace if worn. | |
| insulation? | ||
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| Improper spark plug gap? | Set to proper gap. | |
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| ON/OFF switch is shorted? | Check switch wiring, replace switch. | |
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| Ignition coil defective? | Replace ignition coil. | |
Difficult to start, "fuel is available, and |
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Improper spark gap, points dirtry? | Set correct spark gap and clean points. | ||
SPARK is present at the spark plug". |
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Condenser insulation worn or short | Replace condenser. | ||
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| circuiting? | ||
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| Spark plug wire broken or short circuiting? | Replace defective spark plug wiring. | |
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| Wrong fuel type? | Flush fuel system, and replace with correct type of fuel. | |
Difficult to start, "fuel is available, spark |
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Water or dust in fuel system? | Flush fuel system. | ||
is present and compression is normal" | |||
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| Air cleaner dirty? | Clean or replace air cleaner. | |
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| Suction/exhaust valve stuck or protruded? | ||
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| Piston ring and/or cylinder worn? | Replace piston rings and or piston. | |
Difficult to start, "fuel is available, spark |
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Cylinder head and/or spark plug not | Torque cylinder head bolts and spark plug. | ||
is present and compression is low" | tightened properly? | ||
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| Head gasket and/or spark plug gasket | Replace head and spark plug gaskets. | |
| damaged? | ||
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| Fuel not available in fuel tank? | Fill with correct type of fuel. | |
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| Fuel cock does not open properly? | Apply lubricant to loosen fuel cock lever, replace if necessary. | |
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No fuel present at carburetor. | Fuel filter clogged? | Replace fuel filter. | |
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| Fuel tank cap breather hole clogged? | Clean or replace fuel tank cap. | |
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| Air in fuel line? | Bleed fuel line. | |
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