CRF450RPower of agility and balance Adventure at every turn For 21YM the CRF450R receives a wide array of improvements and upgrades under a development theme of Razorsharp Cornering. Firstly, its 2kg lighter, thanks to a revised frame and subframe. Performance A significant increase (up to 0. 6kW) in peak power above 5,000rpm is accompanied by a stronger lowrpm torque feel, the result of an air box increased in size by 1. 8L to 4. 1L on the clean side.