All-new from the ground-up this year, the 2021 Yamaha MT-09 gets a new motor and chassis, along with a full suite of electronics. Let’s dive in!

1. Although the 2021 Yamaha MT-09 is still a triple, there are significant changes to the powerplant. The pistons, connecting rods, camshafts, and crankcases are new components.
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https://ultimatemotorcycling.com/2020/10/27/2021-yamaha-mt-09-first-look-and-all-new-18-fast-facts/