2025 Yamaha R1m Top Speed. The cp4 powerplant creates an estimated 200 horsepower and a capability of a 183+ mph top speed. Although it’s still unclear whether yamaha uk will sell remaining road stock of the £18,810 standard r1 and £24,660 r1m under derogation (which allows.

The r1m engine has a crossplane crankshaft, meaning that the inner 2 pistons align at a plane that is in the form of a cross to the outer 2 pistons. #1 · dec 8, 2018.