The battle for EPA-legal off-road supremacy continues, as the 2021 Yamaha WR450F gets both motor and chassis updates this year. Tuned for high-performance with low emission (sound and fumes), the WR450F is re-invigorated to do battle with the latest iteration of the Honda CRF450X. It’s time to dive into the updates.

1. The 2021 Yamaha WR450F gets a new cylinder head. Inside the head, you will find steeper valve angles and cam profiles that are more aggressive.
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https://ultimatemotorcycling.com/2020/09/03/2021-yamaha-wr450f-first-look-11-fast-facts-photos-specs/