TROUBLESHOOTING (GASOLINE ENGINE)
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 the diagnosis based on the Engine Troubleshooting (Table 8) information shown below and on the following page. 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 PROBLEM | SOLUTION | |
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Difficult to start |
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| Ignition plug being bridged (shorted)? | Check ignition system. | |
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Fuel is available but spark plug | Carbon deposit at ignition? | Clean or replace ignition. | |
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will not ignite. (Power available |
| Replace insulators. | |
at high tension cable). | Short circuit due to defective insulators? | ||
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| Improper spark gap? | Set spark plug gap to the correct gap. | |
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Fuel is available but spark plug | Short circuit at stop switch? | Check stop switch circuit. Replace stop switch if defective. | |
will not ignite. (Power NOT |
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available at high tension cable). | Ignition coil defective? | Replace ignition coil. | |
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| Defective cylinder head gasket? | Tighten cylinder head bolts or replace head gasket. | |
Fuel is available and spark plug |
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Cylinder worn? | Replace cylinder. | ||
ignites (compressionlow ). | |||
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| Spark plug loose? | Tighen spark plug. | |
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Operation not satisfactory |
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| Air cleaner clogged? | Clean or replace air cleaner. | |
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Not enough power available | Fuel level in carbureator float chamber | Adjust carbureator float | |
improper? | |||
(compression normal, no miss- |
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firing). | Muffler clogged with carbon deposits? | Clean or replace muffler. | |
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| Fuel in use inadequate (water, dust)? | Flush fuel sytem and replace with fresh fuel. | |
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| Ignition coil defective? | Flush fuel sytem and replace with fresh fuel. | |
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| Air in fuel line? | Bleed (remove air) from fuel line. | |
Not enough power available |
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(compression normal, miss- | Carbon deposits in cylinder? | Clean or replace cylinder | |
firing). |
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Ignition plug often shorts? | Replace ignition wires, clean ignition. | ||
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| Fuel in use inadequate (water, dust)? | Flush fuel sytem and replace with fresh fuel. | |
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| Excessive carbon depostion in | Clean or replace crankcase. | |
| combustion chamber? |
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Engine overheats. |
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Exhaust or muffler clogged with carbon. | Clean or replace muffler. | ||
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| Spark plug heat value incorrect? | Replace spark plug with correct type spark plug. | |
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PAGE 34 — MQ MP2 SERIES SAW — OPERATION MANUAL — REV. #0 (01/26/09)
