Yamaha YZ 450 F 2021 — Specifications

What does a motocross bike look like when a team of engineers takes it back to zero with a single goal, victory? The Yamaha YZ 450 F from 2020, and by extension the 2021 model which retains the essentials, is the concrete answer to that question. Yamaha didn’t do things by halves, sweeping away the previous generation to offer a radically new machine, where every gram and every horsepower is put at the service of track efficiency. The result is a bike that weighs only 111 kg fully fueled, a figure that appeals to riders seeking the most agile bike, and which develops a raw power of 55 horsepower. For a little over €9,000, you buy here a pure war machine, not a compromise bike.

The heart of this transformation lies in its engine, a revolutionary 450 cm³ single-cylinder. Its cylinder is now tilted rearward, a configuration that is not just an aesthetic detail. This technical choice, coupled with an exhaust that snakes close to the engine block, aims for extreme mass centralization. The goal is clear: to make this 55-horsepower beast as maneuverable as a 250. The feeling on the handlebars is immediately lighter, more precise, as if the engine disappeared to leave only the rider's intention. This is a philosophy that differs from some competitors, sometimes more brutal and less refined in their overall balance.

But Yamaha didn't stop at pure mechanics. The YZ 450 F is a connected bike, a first in the very traditional world of motocross. Its Power Tuner application, usable from a smartphone, changes the game for the demanding rider. No need for a dedicated box, you adjust the mapping and ignition timing in a few clicks from the edge of the track. A switch on the handlebars even allows you to instantly switch between two mappings, for example to adapt to terrain that is getting wet. This electronic modularity, combined with an electric starter now standard, shows that the brand has understood that modern performance also goes hand in hand with ease of adjustment and reliability at the start.

The chassis is not to be outdone, with a redesigned aluminum frame and top-of-the-line KYB suspension. The inverted fork and single shock offer an infinite range of adjustments to suit all types of terrain and riding styles. The brakes, with a 270 mm front disc, have the bite necessary to tame this propulsive mass, while the lightweight rims contribute to the responsiveness of the steering. The size of the Yamaha YZ 450 F, with its narrow seat at 980 mm high, is designed to allow for quick weight transfers and total freedom of movement. It is a machine that requires physical commitment, it does not forgive passivity.

So, who is the Yamaha YZ 450 F for? Clearly not for the beginner or the Sunday rider. Its price, around €9,200 for the 2021 model, and its sharp character destine it to the competition rider or the assiduous practitioner looking for the most efficient and modern tool. It is a demanding bike, which rewards aggression and technique. Compared to a KTM 450 SX-F or a Honda CRF450R, it may rely less on immediate brutality than on superior balance and maneuverability. Its drawback? Its only 6-liter tank, typical of pure cross, which limits its range to strict track or closed-circuit practice. But in its element, on a grippy track, it is probably the most accomplished and intelligent machine that Yamaha has ever built in this category.