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Rearward-Slanted Cylinder Design
The WR250F’s distinct rearward-slanted cylinder design—complete with rear exhaust and forward-mounted intake system—features a cylinder head that works with the frame geometry for optimized weight distribution. Inside, the engine features all of the updates found in the race-focused YZ250F: a straight intake tract, aggressive cam profiles, high-compression “box bridge” piston design with DLC-coated piston pin, and more.
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Enduro Engine Tuning
WR250F-specfic ignition and fuel injection maps are optimized for enduro riding and racing, for exceptionally smooth and controllable midrange power with longer-lasting pulling power in the top-end.
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Unique Intake and Exhaust Systems
The WR250F features a two-piece air filter that works in conjunction with the tuned intake tract length and a WR-specific muffler to boost the linear feeling of traction and drive. Not only is the WR250F muffler completely mechanical—eliminating the need to repack—it integrates a U.S. Forestry Service-compliant spark arrestor, too.
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High-Capacity Radiator
The WR250F uses a large radiator with excellent cooling capacity shared with the YZ250F motocrosser, complete with a cooling fan for consistent performance during the toughest enduro rides.
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Electric Starter System
The WR250F features a compact electric starter system to simplify restarts on the trail and add convenience everywhere else, powered by an ultra-compact lithium battery.
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Advanced Fuel Injection
The engine breathes through a 44mm Mikuni® throttle body fed by a high pressure electric pump to ensure optimum fuel atomization and power for a wide range of riding elevations and conditions.
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Robust Transmission and Clutch
The WR250F’s wide-ratio 6-speed transmission is shared with the YZ250FX, providing the optimized gear for tight technical terrain as well as wide open fire roads. The clutch system has a specific friction plate combination for heat dissipation and easy clutch lever effort.
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