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Buffalo GEN4065 Frequently Asked Questions Manual page 6

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- How do I change the oil in my generator?
The oil level in this generator should be checked before each use. When the oil level is low, add oil until the level is sufficient to operate this generator.
The oil capacity for this Model GEN4065 Portable Generator engine is 20 fluid oz (0.59 L).
To drain the oil from this generator:
The oil needs to be drained from the crankcase only if it has become gummy or has been contaminated with water, dirt or debris.
Place a bucket underneath this generator to catch oil as it drains.
Unscrew the oil drain plug located on the crankcase underneath the oil filler/dipstick cap.
Allow all the oil to drain from this generator.
Replace the oil drain plug and tighten.
- How should I care for the air filter?
Routine maintenance of the air filter helps maintain proper airflow to the carburetor. Occasionally verify that the air filter is free of excessive dirt. The air filter will require more
frequent cleaning when operating this generator in extremely dusty areas.
To clean the air filter, remove the foam filter element from the generator and wash it in warm water and household dish detergent. Thoroughly rinse and dry. Pour a small
amount of motor oil onto the filter, ring out ALL excess oil, and reinstall the foam filter element in the generator.
Unscrew the bolts, or unsnap the clips at the top and bottom of the air filter cover, located below the choke lever, to access the foam filter element.
- How do I replace the spark plug?
The spark plug is essential for proper engine operation. The spark plug should be intact, free of deposits, and properly gapped. A bad or incorrectly installed spark plug can
cause engine damage.
To inspect or replace the spark plug:
Remove the spark plug by pulling on the spark plug cap.
Unscrew the spark plug from this generator by using the included spark plug wrench.
Visually inspect the spark plug. If it is cracked and/or chipped, discard and install a new spark plug.
This generator comes equipped with a F6TC spark plug. This is a 14mm with a 19mm 3/4" reach thread. Comparable brands and model numbers are Bosch W6DC,
Champion N11YC or NGK BP61S. **Brands/model numbers can change, this information is intended as a guide only, if your sparkplug needs to be replaced, please visit
your local auto parts store for their recommendation.
Measure the spark plug electrode gap with a gauge. The gap should be 0.028-0.031 Inches (0.7-0.8mm).
If you are re-using the spark plug, use a wire brush to clean any dirt from around the spark plug base and then re-gap the spark plug.
Screw the spark plug back into place on this generator by using the included spark plug wrench.
Replace the spark plug cap.
- How do I add gas?
Gasoline and gasoline fumes are highly flammable and explosive. Handling fuel can result in serious injury or burns.
Do not fill the fuel tank near a heat source, sparks or an open flame. Keep gasoline away from appliance pilot lights, barbecues, electric appliances, power tools, etc.
Do not overfill the fuel tank. Always check for fuel spills and immediately wipe them up. Spilled fuel is a fire hazard and causes environmental damage.
Always shut down this generator before refueling. Refuel in a well-ventilated area. Keep heat, sparks and flame away while refueling and away from the location where
gasoline is stored. Never refuel indoors where gasoline fumes may reach flames and/or sparks.
Allow this generator to cool for at least 2 minutes before removing the fuel tank cap. Loosen the cap slowly to relieve pressure in the fuel tank.
To ensure that this generator runs smoothly, use only FRESH, UNLEADED GASOLINE WITH AN OCTANE RATING OF 87 OR HIGHER. Unleaded gasoline produces fewer
engine and spark plug deposits and extends the life of the exhaust system.
Confirm that this generator is on a level surface.
Unscrew fuel tank cap and set aside. (NOTE: The fuel tank cap may be tight and difficult to unscrew.)
Slowly add fresh, unleaded gasoline (with an octane rating 87 or higher) to the fuel tank. Be careful not to fill the fuel tank above the upper limit line. The fuel tank capacity for
this generator is 4 gallon . NOTE: Because gasoline can expand, do not fill the fuel tank to the very top.
Securely tighten the fuel tank cap and immediately wipe up any spilled gasoline with a dry cloth.
IMPORTANT
Use only UNLEADED gasoline with an octane rating of 87 or higher.
Never use a mixture of oil and gasoline.
Never use old and/or contaminated gasoline.
Avoid getting dirt and/or water in the fuel tank.
Gasoline can age in the fuel tank and make it difficult to start this generator. Never store this generator for more than 60 days with gasoline in the fuel tank.
Do not use fuel stabilizers with this generator, doing so could cause damage to the generator, or decrease the fuel and operating efficiency of the generator.
Fuel conditioners may be used to oxygenate the gasoline, and help the engine run more smoothly.
- How do I prepare my generator for storage
When transporting or storing this generator for an extended time, you should:
Allow the generator to fully cool before moving it. A hot engine and exhaust system can burn you, and ignite some materials.
Empty the fuel tank. (See "How do I empty the fuel tank?" in the "Generator Care & Maintenance" section.)
Turn the fuel valve to the "Off" position.
Disconnect the spark plug if you are planning to store this generator for longer than one year without use.
When choosing a storage location, do not crowd or cover the generator, or obstruct any ventilation openings.
Do not drop or strike this generator while moving it.
Store this generator in a cool dry area, free of excessive dust.
Recommended Storage Procedure Based On Length Of Storage This will help prevent difficult starts)
Less than 1 month - No storage procedure required.
1 to 2 months - Fill with fresh gasoline and add gasoline conditioner
2 months to 1 year - Empty the fuel tank and the fuel from the carburetor. (See "How do I empty the fuel tank?" and "How do I empty fuel from the carburetor?" in the
"Generator Care & Maintenance" section.)
1 year or more - Empty the fuel tank, drain the fuel from the carburetor & disconnect the spark plug.
(See "How do I empty the fuel tank?", "How do I empty fuel from the carburetor?" and "How should I care for the sparkplug in my generator?" in the "Generator Care &
Maintenance" section.)
- How do I empty the fuel tank?
To store this generator for extended time, drain the gasoline from the fuel tank. To drain gasoline from this generator:
Turn the fuel valve to the "off" position.
Remove the fuel filter cup.
Empty the fuel filter cup of any fuel.
Place a receptacle underneath this generator to catch gasoline as it drains.
Turn the fuel valve to the "On" position and allow all gasoline to drain.
Replace the fuel filter cup.
Store the drained gasoline in a suitable place.
Do not use fuel stabilizers or other additives with this generator, doing so could cause damage to the generator, or decrease the fuel and operating efficiency of the generator.
- How do I empty fuel from the carburetor
To store this generator for extended time, the fuel needs to be drained from the carburetor.
To drain the gasoline from the carburetor turn the fuel valve to the "off" position while the engine is running. The generator will shut down when all the gasoline in the
carburetor has been used.

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