How Much Power Does the 2025 Kawasaki KX450SR Make?

Kawasaki is the most recent Japanese motorcycle manufacturer to release a special-edition 450cc motocross bike with its KX450SR, which happened in 2022. This model saw a big suspension component change the following year, going from KYB to Showa. Then the Special Racer from Team Green went away in 2024, the same year the standard KX450 received a complete overhaul. With more up-spec parts available in 2025, the KX450SR reappeared, turning Kawasaki’s full-size motocross model duo into a trio once again.

Related: 2023 Kawasaki KX450SR Test Day With Monster Energy Kawasaki

Polished intake ports, a Pro Circuit Ti-6 exhaust system, optimized ECU settings, and an aggressive engine map make up the performance-focused powerplant enhancements the KX450SR boasts over the KX450. How does that translate to the dyno? Our in-house Dynojet 250i rear-wheel dynamometer documented peak figures of 55.3 hp and 34.5 lb.-ft. of torque, which is 1.8 hp and 1.5 lb.-ft. of torque more than the standard model. The Special Racer also pumps out more horsepower and torque than the KX450 from 6,400 rpm to the rev limiter.

“The KX450SR’s increased performance starts right off idle and carries throughout the range,” test rider Casey Casper said. “There are no dips or delays, just instantaneous power at the right wrist. I’m amazed how much more fun and exciting such minimal, though incremental on paper, changes yield on this package.”

Related: 2024 Kawasaki KX450 Long Haul Review