Husqvarna HUV 4421-G / GXP Technical & Consumer Information Gasoline Engines, Oxygenated Fuels

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TECHNICAL & CONSUMER INFORMATION (GASOLINE ENGINES)

Carburetor Modification for High Altitude Operation

At high altitude, the standard carburetor air-fuel mixture will be too rich. Performance will decrease, and fuel consumption will increase. A very rich mixture will also foul the spark plug and cause hard starting. Operation at an altitude that differs from that at which this engine was certified, for extended periods of time, may increase emissions.

High altitude performance can be improved by specific modifications to the carburetor. If you always operate your engine at altitudes above 5,000 feet (1,500 meters), have your servicing dealer perform this carburetor modification. This engine, when operating at high altitude with the carburetor modifications for high altitude use, will meet each emission standard throughout its useful life.

Even with carburetor notification, engine horsepower will decrease about 3.5% for each 1,000-foot (300- meter) increase in altitude. The effect of altitude on horsepower will be greater than this if no carburetor mod- ification is made.

NOTE: When the carburetor has been modified for high altitude operation, the air-fuel mixture will be too lean for low altitude use. Operation at altitudes below 5,000 feet (1,500 meters) with a modified carburetor may cause the engine to overheat and result in serious engine damage. For use at low altitudes, have your servicing dealer return the carburetor to original factory specifications.

Oxygenated Fuels

Some conventional gasolines are being blended with alcohol or an ether compound. These gasolines are col- lectively referred to as oxygenated fuels.

To meet clean air standards, some areas of the United States and Canada use oxygenated fuels to help reduce emissions.

If you use an oxygenated fuel, be sure it is unleaded and meets the minimum octane rating requirement.

Before using an oxygenated fuel, try to confirm the fuel’s contents. Some states/provinces require this infor- mation to be posted on the pump.

The following are the EPA approved percentages of oxygenates:

ETHANOL:

(ethyl or grain alcohol) 10% by volume

 

You may use gasoline containing up to 10% ethanol by volume. Gasoline containing etha-

 

nol may be marketed under the name “Gasohol”.

MTBE:

(methyl tertiary butyl ether) 15% by volume

 

You may use gasoline containing up to 15% MTBE by volume.

METHANOL:

(methyl or wood alcohol) 5% by volume

 

You may use gasoline containing up to 5% methanol by volume, as long as it also contains

 

cosolvents and corrosion inhibitors to protect the fuel system. Gasoline containing more

 

than 5% methanol by volume may cause starting and/or performance problems. It may also

 

damage metal, rubber, and plastic parts of your fuel system.

If you notice any undesirable operating symptoms, try another service station, or switch to another brand of gasoline.

Fuel system damage or performance problems resulting from the use of an oxygenated fuel containing more than the percentages of oxygenates mentioned above are not covered under warranty.

Page 56 2007 HUV 4421 Gasoline and Diesel Vehicle Owner’s Manual

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Contents 2007 Utility Vehicles Page USA Foreword Table of Contents ALL HUV 4421 Models DRIVER/PASSENGER Warning Decal Rotating Parts Decal Diesel Vehicle Feature Identification DAN G E R Caut ION Safety DetailsCaut ION General Warnings DAN G E RAll-wheel Drive Warning Model Identification Controls and IndicatorsGeneral Information See General Warnings onControls and Indicators FORWARD/REVERSE Control KEY Switch Gasoline VehiclesKEY Switch Diesel Vehicles Accelerator PedalBrake Pedal Steering Adjustment LockVolt Accessory Outlet Park BrakeFuel GAUGE/HOUR Meter HIGH-TEMPERATURE Warning Light Diesel Vehicles onlyLOW OIL Warning Light Headlight ControlROLL-OVER Protective Structure and Safety Belts Release Safety BeltSeat Latch and Adjustment INGPRE-OPERATION and Daily Safety Checklist Exhaust system Check for leaksPerformance Inspection Driving InstructionsStarting the Vehicle ALL-WHEEL Drive AWD Operation Stopping the Vehicle BED Latch and Prop RODParking and Leaving the Vehicle Loading and Unloading Cargo Bed LatchVehicle Load Capacities Towing with the Vehicle Transporting on a TrailerStorage See General Warnings on DAN G E RPreparing the Vehicle for Extended Storage OFFReturning the Stored Vehicle to Service Gasoline vehiclesMaintenance MaintenancePeriodic Service Schedule Periodic Service ScheduleMonthly service by owner Annual service by Periodic Lubrication Schedule Periodic Lubrication ScheduleLubrication Points Gasoline Vehicles Brake Fluid Brake Fluid ReservoirEngine OIL OIL Pressure Gasoline EngineEngine OIL Level Check Do not remove dipstick while engine is runningEngine OIL and Filter Change Engine Oil DrainingEngine Oil Filter Change Drain the engine oil. See Engine Oil Draining onRemove Engine Oil Filter Engine Oil Filling OIL ViscosityGearcase Lubrication Front differentialTransmission Rear differentialAIR Intake System AIR Filter ReplacementEngine Coolant Diesel Vehicles Engine Coolant Level CheckFueling Instructions Air Filter InstallationAir Filter Removal Biodiesel Fuel Diesel Vehicles Only Fuel Tank Gasoline VehiclesDraining Water from Fuel Filter Diesel Vehicles OnlyBattery Fuel FilterBattery Using a Booster Battery Jump Starting Jump StartingElectric Winch Accessory Cleaning the VehicleAccessories See following NoteSubsequent Owner Registration MUD Tire OptionVehicle Specifications SpecificationsDIMENSIONS/WEIGHT Tire Pressure Warranty Information Carburetor Modification for High Altitude Operation Technical & Consumer Information Gasoline EnginesOxygenated Fuels Replacement Parts U.S. and California Clean Air ActsProblems That May Affect Emissions MaintenanceCalifornia Emission Control Warranty Statement Your Warranty Rights and ObligationsPage Page Page Husqvarna Part Number 531 30 Edition Code 0706C0307B
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