Yamaha warrior

The Yamaha Warrior was a popular all-terrain vehicle, or four-wheeler last made in 2004. It was designed to compete with the Honda EX400 and the Suzuki R450. Although the Suzuki had the most horsepower out of the three ATVs, the specs on the Warrior surpassed the Honda EX400 and the Suzuki R450 in many areas.

Warrior Specifications
Engine Type	348cc air cooled SOHC four stroke
Bore & Stroke	83mm x 64.5mm
Carburetion	36mm Mikuni
Ignition	CDI
Starter	Electric
Clutch	Manual
Transmission	Six speed w/reverse
Driveline	Chain
Suspension Front	Double wishbone, 7.9" travel
Suspension Rear	Swingarm w/single shock, 7.9" travel
Brakes Front	Dual disc
Brakes Rear	Disc
Tires Front	22x7-10
Tires Rear	22x10-9
Length	72.4"
Width	42.5"
Height	42.5"
Seat Height	30.1"
Ground Clearance	4.9"
Wheelbase	47.2"
Dry Weight	397 lbs
Fuel Capacity	3.2 gal
1997 Price	$4,949
Color's	Blue/White, or Yellow/Black

Engine

• The engine on the Warrior was a 348 cc, but what makes it stand out from bikes like the R450 is the fact that it is a single overhead cam design whereas the EX400 is a dual overhead cam. SOHC engines do not suffer from cam phasing problemss that can cause costly engine damage. Also, if you plan to modify the engine to add more horsepower, the SOHC engine will cost less and require less in-depth knowledge of advanced engines.

Transmission

• The Warrior was equipped with a six-speed manual transmission whereas its competitors had five-speed manual transmissions. The addition of the sixth speed -- commonly called overdrive -- helps to enhance fuel economy and allows higher speeds than capable with a five-speed transmission.

Ride Height

• The seat height, otherwise called the ride height, was 30.1 inches. This was lower than the Suzuki and Honda. This made the vehicle a great choice for younger riders who were ready for an intermediate speed ATV or adults with shorter legs. Being shorter in height complements the slightly less horsepower output.

How to Jet a Yamaha Warrior 350

The stock main jet on a Yamaha Warrior 350 is a 145. The 145 main jet, like the main jets on all carburetors, is designed to work optimally at sea level, around 70 degrees Fahrenheit. But changes in engine performance, altitude or ambient temperature may require you to re-jet the Yamaha Warrior 350's Mikuni carburetor. The Mikuni is a small displacement, single-bowl motorcycle carb with a single main jet that is accessed by removing the fuel bowl.

Instructions

1. Loosen the hose clamps on the air box and intake side of the carburetor with a screwdriver. With the clamps loose, you'll be able to rotate the carburetor toward the right side of the quad, allowing you to access the fuel bowl at the bottom of the carb without removing the carb.
2. Unscrew the four fuel bowl screws and pull the bowl away from the carburetor. Preserve the fuel bowl gasket. With this bowl removed, the main jet will be exposed. Unscrew that jet with a screwdriver. It's likely that you'll be increasing the jet size to account for higher engine performance so note the size of the main jet.
3. Insert a larger sized jet for greater engine performance and colder temperatures or use a smaller size jet for warmer temps and higher altitudes. Re-jetting will require engine testing. Once you've reinstalled the fuel bowl and tightened the fuel bowl screws, push the carb body back into a level position and tighten the hose clamps on the air box and intake sides of the carb. Start the quad and allow it to idle. Test the throttle and ensure that the acceleration characteristics are crisp and responsive.
4. Repeat the re-jetting process, if poor idle or acceleration characteristics persist, until the correct jet size is achieved.