Yamaha WR450F: Fine-tuning of chassis stiffness

It might be an exaggeration to describe the Yamaha WR450F as having a completely new chassis, but the aluminium frame on the 2027 model is not identical to that of the previous year. The tube running down from the steering head, which splits into two square tubes at the level of the crankcase, has been reinforced in the upper section, whilst the lower section is narrower. Added to this are new asymmetrical engine mounts. These modifications are intended to provide greater chassis flexibility and better feedback in slow, technical enduro sections.

On the engine side, the WR450F is fitted with a new camshaft featuring revised valve timing, which delivers a smoother power delivery and reduces the tendency to stall. In addition, the rear brake has been revised, including a reduction in the brake disc diameter from 240 to 220 mm.

Blau, Zylinder nach hinten geneigt, Einlass vorn – unverkennbar eine Yamaha

Foto: Yamaha

The WR250F, which remains largely unchanged in terms of engine and chassis, also benefits from further innovations: the hydraulic clutch actuation, which has been available as an original accessory since 2026, is now fitted as standard on both models. It was about time, as your SPEEDWEEK writer dares to remark.

The electronic engine management system is now equipped with an anti-theft device, which is activated via the Power Tuner app. This app allows (as before) individual adjustments to power delivery and traction control. The price and availability of the WR models, which are available exclusively in blue, have not yet been confirmed.