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Operator’s Manual
MP425
&
MP475
4-Cycle Gas Trimmers
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
P/N 769-02972 (02/07)
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RULES FOR SAFE OPERATION The purpose of safety symbols is to attract your SYMBOL MEANING attention to possible dangers. The safety symbols, and their explanations, deserve your careful attention and understanding. The safety warnings do not by Failure to obey a DANGER: themselves eliminate any danger. The instructions or safety warning will warnings they give are not substitutes for proper result in serious injury to yourself or to accident prevention measures. others. Always follow the safety p
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RULES FOR SAFE OPERATION • Always stop the engine and allow it to cool before • Always hold the unit with both hands when operating. filling the fuel tank. Never remove the fuel tank cap or Keep a firm grip on both handles or grips. add fuel when the engine is hot. Never operate the unit • Keep hands, face, and feet at a distance from all without the fuel cap securely in place. Loosen the fuel moving parts. Do not touch or try to stop the cutting tank cap slowly to relieve any pressure in the ta
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RULES FOR SAFE OPERATION SAFETY AND INTERNATIONAL SYMBOLS This operator's manual describes safety and international symbols and pictographs that may appear on this product. Read the operator's manual for complete safety, assembly, operating and maintenance and repair information. SYMBOL MEANING SYMBOL MEANING • ON/OFF STOP CONTROL • SAFETY ALERT SYMBOL ON / START / RUN Indicates danger, warning, or caution. May be used in conjunction with other symbols or pictographs. • ON/OFF STOP CONTROL OFF
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Unleaded Gasoline OIL AND FUEL INFORMATION RECOMMENDED FUEL TYPE FUELING THE UNIT Old fuel is the primary reason for improper unit Gasoline is performance. Be sure to use fresh, clean, unleaded WARNING: extremely gasoline. flammable. Ignited Vapors may explode. NOTE: This is a four cycle engine. In order to avoid Always stop the engine and allow it to cool damage to the unit, do not mix oil with before filling the fuel tank. Do not smoke gasoline. while filling the tank. Keep sparks and open fla
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MAINTENANCE AND REPAIR INSTRUCTIONS CHECKING THE OIL LEVEL CHANGING THE OIL For a new engine, change the oil after the first 10 hours of operation. Change the oil while the engine is still warm. The To prevent extensive CAUTION: oil will flow freely and carry away more impurities. engine wear and damage to the unit, always maintain the 1. Unplug spark plug boot to prevent accidental starting. proper oil level in the crankcase. Never operate the unit with the oil level below the Wear gloves to bo
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MAINTENANCE AND REPAIR INSTRUCTIONS ROCKER ARM CLEARANCE This requires disassembly of the engine. If you feel Idle Adjustment Screw unsure or unqualified to perform this, take the unit to an authorized service center. NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and then every 25 hours of operation thereafter. • The engine must be cold when checking or adjusting the valve clearance. • This task should be performed inside, in a clean,
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MAINTENANCE AND REPAIR INSTRUCTIONS 3. Remove the screw behind the engine cover (Fig. 35). Adjusting Nuts Rocker Arms INTAKE Screw EXHAUST Feeler Gauge Fig. 35 4. Disconnect the spark plug wire. Fig. 37 5. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. Exhaust socket counterclockwise. Adjusting Nut 6. Remove the engine cover (Fig. 33). Exhaust Rocker Arm 7. Clean dirt from around the rocker arm cover. Remove the screw holding the rocker a
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MAINTENANCE AND REPAIR INSTRUCTIONS REPLACING THE SPARK PLUG CLEANING Use a replacement part number 791-180852 spark plug. The correct air gap is 0.025 in. (0.635 mm). Remove the To avoid serious WARNING: plug after every 25 hours of operation and check its personal injury, condition. always turn your unit off and allow it to cool before you clean or service it. 1. Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug. Use a small brush to clean of
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TROUBLESHOOTING ENGINE WILL NOT START CAUSE ACTION Empty fuel tank Fill fuel tank with new fuel Primer bulb wasn't pressed enough Press primer bulb fully and slowly 10 times Old fuel Drain gas tank and add fresh fuel Fouled spark plug Replace or clean the spark plug Plugged spark arrestor Clean or replace spark arrestor When it is above 40°F outside & the Cold Weather Start Flip the Cold Weather Start Lever to RUN / OPEN Lever is in the CLOSED / START position When it is below 40°F outside & the
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SPECIFICATIONS ENGINE* Engine Type ........................................................................................................................................... Air-Cooled, 4-Cycle Displacement .......................................................................................................................................... 1.6 cu. in. (26.2 cc) Clutch Type........................................................................................................................
