| troubleshooting | ||
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| Troubleshooting (engine) |
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Symptom | possible problem | Solution | |
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| Spark plug bridging? | Check gap, insulation or replace spark plug. | |
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| Carbon deposit on spark plug? | Clean or replace spark plug. | |
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| Short circuit due to defi cient 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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| Fuel reaching carburetor? | Check fuel line. | |
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| Water in fuel tank? | Flush or replace fuel tank. | |
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| Fuel fi lter clogged? | Replace fuel fi lter. | |
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Diffi cult to start, fuel is available, but no spark at | Stuck carburetor? | Check fl oat mechanism. | |
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Spark plug is red? | Check transistor ignition unit. | ||
spark plug. | |||
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| If insuffi cient compression, repair or replace | |
| Spark plug is bluish white? | engine. If injected air leaking, correct leak. If | |
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| carburetor jets clogged, clean carburetor. | |
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| Check transistor ignition unit is broken, and | |
| No spark present at tip of spark plug? | replace defective unit. Check if voltage cord | |
| cracked or broken and replace. Check if spark | ||
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| plug if fouled and replace. | |
| No oil? | Add oil as required. | |
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| Oil pressure alarm lamp blinks upon starting? (if | Check automatic shutdown circuit, "oil sensor". | |
| applicable) | (if applicable) | |
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| ON/OFF switch is shorted? | Check switch wiring, replace switch. | |
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Diffi cult to start, fuel is available, and spark is | Ignition coil defective? | Replace ignition coil. | |
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Improper spark gap, points dirty? | Set correct spark gap and clean points. | ||
present at the spark plug. | |||
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Condenser insulation worn or short circuiting? | Replace condenser. | ||
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| Spark plug wire broken or short circuiting? | Replace defective spark plug wiring. | |
| Wrong fuel type? | Flush fuel system, replace with correct type of | |
| fuel. | ||
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Diffi cult to start, fuel is available, spark is |
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Water or dust in fuel system? | Flush fuel system. | ||
present and compression is normal. | |||
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Air cleaner dirty? | Clean or replace air cleaner. | ||
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| Choke open? | Close choke. | |
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| Suction/exhaust valve stuck or protruded? | Reseat valves. | |
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Diffi cult to start, fuel is available, spark is | Piston ring and/or cylinder worn? | Replace piston rings and/or piston. | |
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Cylinder head and/or spark plug not tightened |
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present and compression is low. | Torque cylinder head bolts and spark plug. | ||
properly? | |||
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| Head gasket and/or spark plug gasket damaged? | Replace head and spark plug gaskets. | |
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| No fuel 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. | ||
No fuel present at carburetor. |
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Fuel fi lter/lines clogged? | Replace fuel fi lter. | ||
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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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page 38 — b46S90