| Specification | Value |
|---|---|
| Production Years | 2008 – 2020 |
| Engine Oil | SAE 10W-40 (API SG+, JASO MA) – 1.4 L |
| Tires (F/R) | 80/100-21 M/C 51P / 120/80-18 M/C 62P |
| Tire Pressure | Front: 1.25 bar (18 psi) / Rear: 1.50 bar (22 psi) |
| Battery | YTZ7S |
| Spark Plug | NGK CR9EK (Gap: 0.6 – 0.7 mm) |
Engineering Heritage: The Titanium Heart
The Yamaha WR 250 R, specifically the DG201/32DH/13 series, holds a unique place in motorcycling history as the first Japanese 250cc dual-sport to utilize titanium intake valves. Unlike its competitors of the era, which favored low-maintenance but heavy steel components, Yamaha engineers derived the WR-R’s cylinder head architecture directly from the YZ250F motocross program. This allowed for a staggering 10,000 RPM redline while maintaining a 26,000-mile valve adjustment interval—a feat of engineering that effectively bridged the gap between high-performance racing machines and reliable street commuters.
Technical Review: Performance and Reliability
The DG201 chassis is a sophisticated semi-double-cradle frame, utilizing a combination of cast and forged aluminum sections with steel down-tubes. This hybrid construction provides the necessary flex for off-road compliance while maintaining high-speed stability on the tarmac. The 250cc liquid-cooled DOHC engine is fuel-injected, providing crisp throttle response across various altitudes, a critical feature for adventure riders.
Maintenance Guide: Keeping the WR-R Peak
Lubrication System
For optimal performance, MotoSpecsLab recommends SAE 10W-40 oil. Ensure the oil meets JASO MA standards to prevent clutch slippage. The total capacity is 1.4 Liters. Regular changes are vital, especially if the bike is used in heavy off-road conditions where dust ingestion is a risk.
Ignition and Electrical
The NGK CR9EK is the specified spark plug. For precise combustion, the gap must be set strictly between 0.6 and 0.7 mm. The electrical system is supported by the compact YTZ7S battery, which provides high cranking amps relative to its weight, essential for the high-compression start-ups of this single-cylinder engine.
Tires and Handling
To maintain the intended geometry and safety, use 80/100-21 for the front and 120/80-18 for the rear. For mixed-use riding, the factory-recommended pressures are 1.25 bar (18 psi) front and 1.50 bar (22 psi) rear. Lowering these pressures for pure off-road use is common but requires rim locks to prevent tire slippage.
Frequently Asked Questions
A: Yes. Due to its 350W alternator output and robust subframe, it is one of the few small-displacement bikes capable of powering heated gear and carrying luggage reliably.
A: The twin-ground electrode design of the CR9EK offers better ignitability and resistance to fouling in the high-revving environment of the WR 250 R engine.