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| TABLE 7. 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. |
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| at high tension cable). |
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| 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. |
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| 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. |
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| deposits? |
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| Mixed fuel quality is | Check fuel to oil mixture. |
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| Fuel is available and spark plug | inadequate? |
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| ignites (compression normal). |
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| Fuel in use inadequate (water, | Flush fuel sytem and replace with fresh fuel. |
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| dust)? |
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| Air Cleaner clogged? | Clean or replace air cleaner. |
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| Defective cylinder head gasket? | Tighten cylinder head bolts or replace head gasket. |
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| Fuel is available and spark plug |
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| Cylinder worn? | Replace cylinder. |
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| ignites (compression low ). |
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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 | Air in fuel line? | Bleed (remove air) from fuel line. |
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| (compression normal, no miss- | Fuel level in carbureator float |
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| firing). | Adjust carbureator float |
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| chamber improper? |
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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. |
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| Not enough power available |
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| Ignition plug often shorts? | Replace ignition wires, clean ignition. |
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| (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. |
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| combustion chamber? |
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| Engine overheats. | Exhaust or muffler clogged with | Clean or replace muffler. |
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| carbon. |
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| Spark plug heat value incorrect? | Replace spark plug with correct type spark plug. |
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PAGE 26 — STOW
