U-Max Medium Duty IV 4-Stroke Gas Features & Specifications

When your need calls for extra-heavy load capabilities the all-new Medium Duty IV is your clear choice.

Power comes from either a 357cc four-stroke engine or a super powerful 48-volt electric system with 8 6-volt batteries and a large 400-amp controller.

Both are capable of carrying up to 800 pounds in the roto molded cargo box and 4 people. In addition, the new Medium Duty IV comes standard with a host of features including four-wheel brakes, streamline headlights and a 12-volt DC accessory outlet.

 

Accessory Outlet
The 12 volt DC power outlet is dash mounted for convenience.
Armrest
Large armrests on both the driver and passenger sides helps the occupants feel more comfortable and secure.
Body Panels
The U-MAX front body is made of a custom formulated, color-matched thermoplastic olefin, painted with a two-part topcoat of high-luster, automotive-grade polyurethane.
The rear body is made of Vacuum-formed ABS plastic coated with tough UV resistant Solarkote.
Brakes
Mechanical, self-adjusting individual drum-shoe brakes on all four wheels allow you to stop and work anywhere.
Brake Pedal
The U-MAX features a re-designed brake pedal with the parking brake located in the top-left corner.
Bumper
Yamaha's energy absorbing bumper releases air upon impact, protecting the body and frame.
Dash Panel
The fully integrated dash boasts cup holders, a low oil warning light, and two large storage compartments.
Easy-Grip Steering Wheel
The thick, textured, easy-grip steering wheel features an integrated notepad clip and pencil holder.
357F™ Engine
Yamaha engines work as hard as you do.
The tough and reliable Yamaha purpose-built, low-emission, overhead valve 357cc engine offers up 11.4 horsepower of muscle to handle a variety of demanding jobs.
Filterless Oil System
Yamaha engines utilize a splash-style positive oil lubrication system that eliminates the need for an oil filter and oil pump, saving you the expense of purchasing new oil filters and the headache of having to dispose of used ones.
Floorboard Access Panel
Another Yamaha exclusive, the removable floor access panel allows for quick and easy access to the brake and accelerator components for those rarely needed adjustments.
Floormat
Yamaha's textured floormats are located on both the floorboard and footrest areas.
Frame
Yamaha engineers have minimized welds to provide a seamless tubular ladder-style steel frame, providing optimum strength and rigidity.
Yamaha frames are protected by a eighteen step paint process, which includes an anti-corrosive full immersion phosphate treatment, electro-deposition epoxy-base coating, and an electrostatically applied polyester/urethane powder topcoat.
Greaseless Chassis
Yamaha utility vehicles are designed to save you time and money. Higher quality components, such as sealed bearings, automotive grade tie-rods and steering components, never need greasing resulting in a virtually greaseless vehicle.
Headlights & Tail Lights
The U-MAX comes standard with tough tested tail lights and dual 30 watt Krypton multi-reflector style headlights that can be seen on many Yamaha ATV's.
Horn
The standard horn is conveniently located within a foot's reach.
Mud Flaps
Standard front and rear mud flaps protect occupants and cargo from mud and water puddles.
Paint Colors
U-MAX utility vehicles are available in Hunter Green.
Seat
The U-MAX Medium Duty IV has comfortable and durable seat cushions made of supple, high-density foam, wrapped in seamless durable fabric-backed vinyl. The cushions are mated to a warp and moisture resistant polypropylene seat bottom.
Trailer Hitch
The standard 2 inch receiver accomodates a wide variety of accessories.
Tires and Rims
The U-MAX Medium Duty IV has 18 inch tires rated at 4-ply in the front and 6-ply in the rear. Tires are mounted to durable powder coated, gunmetal grey steel rims.
Utility Dump Bed
With a low 27 inch load height, the hydraulic-assisted tilting utility dump bed has a fold and lock tailgate and is made of tough Roto-Molded linear Polyethylene. The bed has side slots so you can add stakeside boards.

 

DIMENSIONS
OVERALL LENGTH 148.6 in (3774 mm)
OVERALL WIDTH 48.9 in (1243 mm)
OVERALL HEIGHT (without suntop) 47.2 in (1200 mm)
WHEELBASE 108.5 in (2756 mm)
MINIMUM GROUND CLEARANCE 3.8 in (97 mm)
CARGO BED SIZE (LxWxH) 42.4 in (1077 mm) x 44.2 in (1123 mm) x 9.0 in (229 mm)
ENGINE/DRIVE TRAIN
DRY WEIGHT 48.5 lb (22 kg)
ENGINE TYPE Yamaha built, low emission single cylinder 60° incline OHV
DISPLACEMENT 357 cm3
BORE x STROKE 85 x 63 mm
HORSEPOWER 11.4 HP (8.5 Kw / 3500 rpm)
COMPRESSION RATIO 8.1:1
LUBRICATION SYSTEM Splash style positive oil lubrication
OIL CAPACITY 1 U.S. quart (1 liter, 1000 cc)
AIR CLEANER Two stage, urethane-foam pre-cleaner and high-capacity pleated paper cartridge
COOLING SYSTEM Forced cooling
CARBURETOR Mikuni BV26-18
IGNITION SYSTEM Transistor magneto ignition
SPARK PLUG BPR2ES / BPR4ES (NGK)
TRANAXLE V-belt automatic forward / reverse transaxle equipped with high-precision helical gears, 15.38:1 drive axle ratio
CHASSIS
FRAME Seamless tubular ladder-style steel frame protected with an anti-corrosive full immersion phosphate treatment, electro-deposition epoxy-base coating, and an electrostatically applied polyester/urethane powder topcoat
FRONT BODY Custom-formulated thermoplastic olefin, painted with a two-part top coat of high-luster automotive-grade polyurethane
REAR BODY Vacuum-formed ABS plastic coated with tough UV resistant Solarkote
STEERING Adjustable worm gear and pitman pin system, permanently lubricated
FRONT SUSPENSION Fully independent strut suspension with cast aluminum front hubs and permanently lubricated, sealed ball bearings
REAR SUSPENSION Yamaha’s exclusive UltraPath rear suspension with coil springs and hydraulic shock absorbers
BRAKES Mechanical, self-adjusting individual drum-shoe brakes on all four wheels
SEATING Seamless, fabric-backed vinyl over new, high density molded-foam cushions mated to a warp and moisture resistant polypropylene seat bottom
FRONT BUMPER Energy-absorbing 5 mph bumper
PERFORMANCE
MAX FORWARD SPEED 15 mph (24 km/h)
MAX REVERSE SPEED 10 mph (16 km/h)
TURNING RADIUS 156.7 in (3.98 m)
GENERAL
DRY WEIGHT (less battery) 1051 lbs (477 kg)
FUEL TANK CAPACITY 7.9 US gal (30.0 L)
TIRE SIZE 18.00 x 8.50-8.00 (4-ply rating front, 6-ply rating rear)

CARGO BED PAYLOAD CAPACITY 800 lbs (363 kg)
CARO BED TYPE Roto-molded polyethylene bed with fold and lock tailgate and hydraulic-assisted tilt
SEATING CAPACITY 4 persons
ACCESSORY OUTLET Dash mounted 12 volt DC power outlet
HEADLIGHTS / TAIL LIGHTS Standard tail lights and dual 30 watt Krypton multi-reflector headlights
BATTERY U.S. Battery 12V - 450 cold cranking amps 75 min. reserve capacity
WARRANTY
Warranty Standard 1 year limited vehicle warranty

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