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The Yamaha YFZ450 is a high-performance, four-stroke ATV(All-Terrain Vehicle). Introduced in 2003 as a 2004 model, it was a huge leap forward relative to its competition. It uses many light-weight materials to give it the lowest dry-weight (350 lbs.) of any 450-class sport ATV. more...

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Overall, it is a very capable ATV, with good handling, braking, and overall performance.

This ATV was considered "revolutionary" and the "biggest step toward an off the showroom floor race ready ATV available by any the four major Japanese manufactures". By the end of the 2004 ATV racing season, two of the three National Championships were claimed by riders riding the Yamaha YFZ450: Keith Little, Brandon and Bill Ballance.

General

The Yamaha YFZ450 is a comfortable bike. For an ATV, it is very narrow, designed with the rider in mind. On the front, the fender is moved forward so that tall riders can fit themselves on it nicely. The acceleration and handling is all very smooth, as expected from a Yamaha ATV.

Yamaha claims that the 2007 edition of the YFZ450 is the "lightest, most powerful ATV ever, winner of just about every magazine shootout". It comes standard with a pushbutton electric starter and a flip-type parking brake. New change for the 2007 model include an aluminum handlebar, redisgned front master brake cylinder, drilled rear disc brake, and an internal oil jet. These features boost handling, braking, and improve the ride of the ATV.

A few simple modifications can be made to increase power. Removing the air-box lid, as well as the baffle and spark arrestor from the exhaust pipe will improve the air flow into and out of the motor. Another popular modification is to retard the exhaust cam one tooth, giving it the same cam timing as the YZ450F dirt bike. These changes together with the appropriate carburetor adjustments are practically free and result in a significant power increase.

Since its introduction in late 2003, the Yamaha YFZ450 has seen a massive explosion in after market parts. Many manufactures were quick to launch exhaust pipes, suspension parts, and body work. Some of these parts are said to increase horsepower and performance!

It is interesting to note that while Yamaha tends to share naming structures amongst similar products (the YZ-series dirt bikes for example), the only other Yamaha product to carry the YFZ designation is the legendary Banshee (known as the YFZ350 in Yamaha part catalogs and manuals).

Model Year Changes

The YFZ450 model as a whole has not changed much; however, many small changes have been made throughout its run.

Read more at Wikipedia.org