| Component | Specification |
|---|---|
| Engine Oil | SAE 10W-40, API SG+, JASO MA (0.9 L) |
| Spark Plug | NGK LMAR8G |
| Battery | YTZ7S |
| Front Tire | 90/90-21 54M (1.0 bar / 15 psi) |
| Rear Tire | 130/90-18 69M (1.0 bar / 15 psi) |
| Production Years | 2015 – 2018 |
The 2015 release of the Yamaha WR 250 F (CG36W) marked a revolutionary departure from traditional enduro design by being the first off-road machine to adopt the rearward-slanted cylinder and reverse cylinder head layout from the championship-winning YZ250F. This engineering feat effectively centralized mass while creating a straight intake path, significantly enhancing throttle response and handling agility in technical terrain.
Engineering Analysis: The CG36W / 2GBM Evolution
Between 2015 and 2018, the WR 250 F redefined the 250cc four-stroke enduro class. By utilizing the bilateral beam aluminum frame of the YZ series but tuning it for enduro-specific flex, Yamaha achieved a balance of high-speed stability and low-speed precision. The 2GBM designation refers to the specific tuning and components required for competition-ready performance while maintaining the durability expected of the WR (Wide Ratio) lineage.
Essential Maintenance Protocol
Lubrication System
The high-revving nature of the 250cc engine demands strict adherence to oil quality. The system requires 0.9 liters of SAE 10W-40. It is imperative to use oil that meets JASO MA standards to ensure the wet clutch system operates without slippage. Given the 0.9L capacity, frequent changes are recommended after every 10-15 hours of hard competitive use.
Ignition and Electrical
The CG36W utilizes the NGK LMAR8G spark plug, which is designed to withstand the high thermal loads of enduro racing. For starting reliability, especially in cold conditions or after stalls, the YTZ7S battery provides the necessary cold cranking amps while remaining lightweight.
Chassis and Traction
The tire configuration for this model is optimized for 18-inch rear wheels, a staple for enduro traction. The recommended 90/90-21 front and 130/90-18 rear should be maintained at 1.0 bar (15 psi) for general use, though pressures may be lowered for extreme mud or rock sections if rim locks are properly secured.
MotoSpecsLab Verdict
The Yamaha WR 250 F (2015-2018) remains a benchmark for reliability and performance. Its transition to the fuel-injected, reverse-head engine makes it a favorite for riders who demand a modern powerband with the legendary durability of the Yamaha WR badge. Proper maintenance of the tight 0.9L oil reservoir is the single most important factor in preserving the longevity of this high-performance machine.