2021 Yamaha YZ450FX First Look
The YZ450FX highlights Yamaha’s competition cross-country lineup for 2021. It now features all of the major changes that the YZ450F motocrosser got last year (2020). The rest of Yamaha’s “X” lineup—YZ250FX, YZ250X and YZ125X—return with visual updates.
The YZ450FX’s 449cc, liquid-cooled, four-stroke, electric-start engine features a compact cylinder head with redesigned combustion chamber shape and steeper valve angles. The rearward-slanted cylinder houses a higher compression piston with low friction rings attached to a longer connecting rod. The wide ratio, five-speed transmission has been refined to provide smoother shifting, and a more efficient crankcase breather system has been adopted to decrease pumping losses. In all, Yamaha claims that the lighter, more compact engine produces increased power across the entire RPM range for stronger and more linear pulling power.
The frame has been redesigned with all-new flex characteristics that, according to Yamaha, provides improved cornering performance, traction and bump reaction. Other chassis components such as engine mounts, top triple clamp and front axle, as well as its KYB suspension were refined to reduce weight while improving handling and performance. The 2021 YZ450FX features a newly designed front brake caliper, brake pads and front and rear disc.
Availability: September for the 2021 YZ450FX ($9699) and October for the YZ250FX ($8499). The two-strokes—2021 YZ125X ($6699) and YZ250X ($7599)—are expected to be available in July. CN