| MTX70 | ||
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| TABLE 4. ENGINE TROUBLESHOOTING | ||
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SYMPTOM | POSSIBLE PROBLEM | SOLUTION | |
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Difficult to start |
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| Ignition plug being bridge? | 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 | Short circuit due to defective | Replace insulators. | |
at high tension cable). | |||
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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| Muffler clogged with carbon | Clean or replace muffler. | |
| deposits? |
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Fuel is available and spark plug |
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Fuel in use inadequate (water, | Flush fuel sytem and replace with fresh fuel. | ||
ignites (compression normal). | |||
dust)? |
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| Air Cleaner clogged? | Clean or replace air cleaner. | |
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Fuel is available and spark plug | Cylinder worn? | Replace cylinder. | |
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ignites (compression low). | Spark plug loose? | Tighten spark plug. | |
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Low compression. | Incorrect valve adjustment? | Check and adjust valves. | |
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Operation not satisfactory |
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| Air cleaner clogged? | Clean or replace air cleaner. | |
Not enough power available |
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(compression normal, no miss- | Air in fuel line? | Bleed (remove air) from fuel line. | |
firing). |
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Carbon deposits in cylinder? | Clean or replace cylinder | ||
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| Ignition coil defective? | Flush fuel sytem and replace with fresh fuel. | |
Not enough power available |
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Ignition plug often shorts? | Replace ignition wires, clean ignition. | ||
(compression normal, miss- | |||
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firing). | Fuel in use inadequate (water, | Flush fuel sytem and replace with fresh fuel. | |
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| dust)? |
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| Excessive carbon depostion in | Clean or replace crankcase. | |
| combustion chamber? |
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Engine overheats. | Exhaust or muffler clogged with | Clean or replace muffler. | |
| carbon. |
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| Spark plug heat value incorrect? | Replace spark plug with correct type spark plug. | |
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Engine high speed incorrect. | Incorrect engine RPM? | Check and adjust engine RPM to | |
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PAGE 18 — MTX70 — OPERATION AND PARTS MANUAL — REV. #12 (02/22/12)