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Even with carburetor modification, engine horsepower will decrease about 3.5% for each 1,000 feet increase in altitude. The effect of altitude on horsepower will be greater than this if no carburetor modification is made. 1 IMPORTANT NOTICE 1 0 nce a carburetor is jetted for hiah altitude use, operation at lower altitudes without rejetting-may result inreduced perfor- mance, overheating, and serious engine damage. It is especially important to rejet a carburetor when going from a higher altitude to a lower one. At lower altitudes, the air/fuel mixture may become excessively lean. 6. STOPPING THE ENGINE 1. Move the throttle lever down fully. 2. Turn the engine switch to the OFF position. ENGINE SWITCH THROTTLE LEVER 3. Turn the fuel valve OFF. I FUEL VALVE NOTE: To stop the engine in an emergency, turn the engine switch to the OFF position. 7. MAINTENANCE The purpose of the maintenance and adjustment schedule is to keep the pump in the best operating condition. Inspect or service as scheduled in the table below. m Shut off the engine before performing any maintenance. If the engine must be run, make-sure the area is weli ventilated. The exhaust contains poisonous carbon monoxide gas. 1 IMPORTANT NOTICE ] u se only genuine HONDA parts or their equivalent for maintenance or repair. Replacement parts which are not of equivalent quality may damage your water pump. Maintenance Schedule Combustion Chamber Clean-Lap valves 0121 Fuel tank__ .- and strainer Clean 012) Impeller Check 012) Impeller clearance Check O(2) Casing Cover Check O(2) Pump inlet valve Check O(2) Fuel line Check 1Rnnlar.e if nncnnnarvl Every 2 years (2) NOTE (1): Service more frequently when used in dusty areas. (2): These items should be serviced by an authorized Honda dealer, unless the owner has the proper tools and is mechanically proficient. See the Honda Shop Manual. TOOL KIT Em) SPARK PLUG WRENCH D ) WRENCH HANDLE 10 x 12 mm WRENCH 3-G 14xl7mmWRENCH IO TOOL BAG 1. Oil change Drain the oil while the engine is still warm to assure rapid and complete draining. m Used motor oil may cause skin cancer if repeatedly left in con- tact with the skin for prolonged periods. Although this is unlikely unless you handle used oil on a daily basis, it is still advisable to thoroughly wash your hands with soap and water as soon as possible after handling used oil. 1. Remove the oil filler cap and the drain plug to drain the oil. 2. Reinstalj the drain plug and tighten securely. 3. Refill with the recommended oil (see page 7) to the specified level. OIL CAPACITY: 0.7 P (0.74 US qt) PLUG NOTE: Please dispose of used motor oil in a manner that doesn’t harm the environment. We suggest you take it in a sealed container to your local service station for reclamation. Do not throw it in the trash or pour it on the ground or down a drain. 2. Air cleaner service A dirty air cleaner will restrict air flow to the carburetor. To prevent car- buretor malfunction, service the air cleaner regularly. Service more fre- quently when operating the pump in extremely dusty areas. m Never use gasoline or low flash point solvents for cleaning the air cleaner element. A fire or explosion could result. 1 IMPORTANT NOTICE ( N ever run the engine without the air cleaner. Rapid engine wear will result. 1. Loosen the wing nut, remove the air cleaner cover and remove the air cleaner element. 2. Wash the air cleaner element in a solution of household detergent and warm water, then rinse thoroughly, or wash in nonflammable or high flashpoint solvent. Allow the element to dry thoroughly. 3. Soak the element in clean engine oil, and squeeze out the excess oil. The engine will smoke during initial start-up if too much oil is left in the foam. 4. Reinstall the air cleaner element and the cover. AIR CLEANER ELEMENT AIR CLEANER COVER 3. Spark plug service Recommended spark plug: BP4HS-10 (NGK) To ensure proper engine operation, the spark plug must be properly gap- ped and free of deposits. 1. Remove the spark plug. m If the engine has be& running, the muffler will be very hot. Be careful not to touch the muffler. SPARK PLUG WRENCH 2. Visually inspect the spark plug. Discard it if the insulator is cracked or chipped. Clean the spark plug with a wire brush if it is to be reused. 3. Measure the plug gap with a feeler gauge. The gap should be 0.9- 1 .O mm (0.035-0.039 in). Correct as necessary by bending the side electrode. 0.9-1 .O mm (0.035-0.039 in) ~ 4. Check that the spark plug washer is in good condition, and thread the spark plug in by hand to prevent cross-threading. 5. After the spark plug is seated, tighten with a spark plug wrench to com- press the washer. NOTE: If installing a new spark plug, tighten l/2 turn after the spark plug seats to compress the washer. If reinstalling a used spark plug, tighten l/8-l/4 turn after the spark plug seats to compress the washer. 1 IMPORTANT NOTICE ] Th e spark plug must be securely tightened. An im- properly tightened plug can become very hot and dam...
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