Yamaha’s new WR250F has undergone a major engine and chassis upgrade featuring the latest technology from the YZ250F. And of course it has the unique reverse cylinder head motor design and Power Tuner smartphone app for easy track tuning. The more powerful engine delivers stronger performance across the entire rev range, the revised frame has had its stiffness tweaked to improve feel and there’s even a more powerful braking system. And it’s all at a price that undercuts its enduro racer rivals. MotoHead’s Dave Willet tested the bike on enduro, extreme and motocross to see if it really is the bike Yamaha has been promising.