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| troubleshooting | |
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| Troubleshooting (engine) |
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symptom | possible problem |
| solution |
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| Combo lever in incorrect position? |
| Make sure combo lever is in start position. |
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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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Diffi cult to start, fuel is available, but no spark at | Fuel fi lter clogged? |
| Replace fuel fi lter. |
spark plug. | Stuck carburetor? |
| Check fl oat mechanism. |
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| Spark plug is red? |
| Check transistor ignition unit. |
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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 |
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| cracked or broken and replace. Check if spark | |
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| plug if fouled and replace. |
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| No oil? |
| Add oil as required. |
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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. |
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| Wrong fuel type? |
| Flush fuel system, replace with correct type of |
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| 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. |
| 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. |
| Fuel cock does not open properly? |
| Apply lubricant to loosen fuel cock lever, |
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| 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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