| Component | Specification |
|---|---|
| Model Series | CG36W / 2GB3 (2017) |
| Engine Oil | Yamalube 4 SAE 10W-40 (API SG/JASO MA) |
| Oil Capacity | 0.71 Liters |
| Front Tire | 90/90-21 54R (1.0 bar / 15 psi) |
| Rear Tire | 130/90-18 69R (1.0 bar / 15 psi) |
| Spark Plug | NGK LMAR8G |
| Battery | GS Yuasa YTZ7S |
The 2017 Yamaha WR 250 F (CG36W/2GB3) represents a pivotal moment in enduro engineering. While many competitors were refining traditional layouts, Yamaha perfected the rearward-slanted cylinder and front-intake design. This unique engineering choice, inherited directly from the YZ-F motocross line, centralizes mass and provides a straight intake tract for superior throttle response—a critical advantage in technical single-track environments.
Engineering Analysis
The CG36W chassis is renowned for its bilateral beam aluminum frame, which provides the rigidity required for high-speed stability while maintaining the flex characteristics necessary for absorbing trail chatter. The 2017 iteration further refined the KYB® SSS (Speed Sensitive System) front forks, widely regarded as the gold standard in mechanical suspension, offering a plush initial stroke that resists bottoming out during aggressive G-outs.
Maintenance & Service Essentials
To maintain the high-performance capabilities of the WR 250 F, strict adherence to fluid and ignition specifications is mandatory. The engine utilizes a high-compression setup that demands a specific spark plug: the NGK LMAR8G. This long-reach plug is essential for efficient combustion and heat dissipation.
Regarding lubrication, the 2017 model is precise. It requires 0.71 liters of Yamalube 4 SAE 10W-40. Given the small oil capacity and high-revving nature of the 250cc powerplant, MotoSpecsLab recommends frequent oil changes, especially after competitive use or muddy conditions. For electrical reliability, the GS Yuasa YTZ7S battery provides the necessary cold-cranking amps to ensure the electric start functions flawlessly in remote locations.
Tire Setup and Handling
The factory tire configuration (90/90-21 front and 130/90-18 rear) is optimized for a balance of flotation and bite. Running a consistent 1.0 bar (15 psi) is the factory baseline; however, experienced riders may drop pressures slightly for increased traction in wet roots or rock gardens, provided they are utilizing heavy-duty tubes or rim locks to prevent pinch flats.
Summary
The Yamaha WR 250 F 2017 remains a benchmark for reliability and performance in the 250cc four-stroke enduro category. By following the precise maintenance specs—specifically regarding oil volume and plug type—owners can ensure this machine delivers its championship-winning potential for years to age.