| Specification | Detail |
|---|---|
| Model ID | DG202 / 32DP / 14 |
| Production Years | 2008 – 2017 |
| Engine Type | 250cc Liquid-cooled 4-stroke, DOHC, 4-valve |
| Engine Oil | SAE 10W-40 API SG, JASO MA (1.4 L) |
| Tires (Front/Rear) | 110/70R17 M/C 54H / 140/70R17 M/C 66H |
| Spark Plug | NGK CR9EK |
| Battery | YTZ7S (12V / 6Ah) |
Distinguished by its race-bred DNA, the Yamaha WR 250 X holds a unique place in motorcycling history as the first Japanese 250cc street-legal motorcycle to utilize titanium intake valves. Derived directly from the YZ-F motocross program, this engineering choice allowed Yamaha to push the redline to a staggering 10,000 RPM while maintaining valve-clearance inspection intervals of 26,000 miles (42,000 km)—a feat previously unheard of in the high-performance small-displacement segment.
Engineering Overview: The DG202 Chassis
Unlike many competitors that adapted trail bikes for the street, the WR 250 X (DG202) was engineered with a dedicated supermoto philosophy. The frame is a sophisticated three-section hybrid, utilizing cast aluminum for the main frame, forged aluminum for the tank rails, and high-tensile steel for the down-tubes. This provides the torsional rigidity required for aggressive cornering on 17-inch wheels.
Maintenance Guide & Technical Specs
Lubrication System
The WR 250 X utilizes a wet-sump system. For optimal performance and clutch longevity, use 1.4 Liters of SAE 10W-40 oil. It is imperative that the oil meets JASO MA standards to ensure the wet clutch does not slip. The oil filter should be replaced every second oil change under normal conditions, or more frequently if used in competitive environments.
Ignition and Electrical
The high-compression engine (11.8:1) relies on a precise spark provided by the NGK CR9EK plug. Gapping should be strictly maintained between 0.6–0.7mm. The electrical system is supported by the compact YTZ7S battery; given the fuel-injected nature of the DG202, maintaining a healthy voltage is critical for consistent starting and ECU mapping performance.
Drivetrain and Wheels
Equipped with 17-inch radial tires, the ‘X’ variant offers significantly more grip than its ‘R’ counterpart. Recommended pressures for street use are 2.0 bar (29 psi) front and 2.3 bar (33 psi) rear. These pressures balance heat generation with carcass stability during deep lean angles.
MotoSpecsLab Verdict
The Yamaha WR 250 X remains a benchmark for reliability in the lightweight supermoto category. Its fuel-injected, high-revving heart offers a level of technical sophistication that few modern 250s can match. For the owner-mechanic, adhering to the JASO MA oil specification and monitoring the titanium valve train are the keys to a lifetime of performance.