| Specification | Data |
|---|---|
| Production Years | 2004 – 2017 |
| Engine Oil | SAE 10W-30 (0.69 L) |
| Transmission Oil | SAE 10W-30 (0.60 L) |
| Spark Plug | NGK IMR8C-9H |
| Battery | YTZ7S |
| Tire Size (Front/Rear) | 80/100-21 / 100/100-18 |
| Tire Pressure | 1.0 bar (15 psi) |
The Honda CRF 250 X (ME11A/B/11) represents a pivotal moment in off-road engineering: it was Honda’s first dedicated 250cc four-stroke enduro machine to successfully integrate an electric starter while retaining the high-performance Unicam engine architecture from the CRF250R motocrosser. This unique engineering choice allowed for a significantly lower center of gravity compared to traditional dual-overhead-cam (DOHC) designs, providing the nimble handling required for tight woods riding.
Engineering Excellence: The Unicam Heart
At the core of the CRF 250 X is the liquid-cooled, 249cc single-cylinder engine. Unlike its motocross sibling, the ‘X’ model is tuned for a broader powerband, featuring different cam profiles and a specialized exhaust system. The ME11 series is renowned for its reliability, provided that the rigorous maintenance schedule for the titanium intake valves is strictly followed. The split-sump lubrication system is a critical technical highlight, separating engine oil from transmission oil to prevent clutch debris from contaminating the crankshaft and piston assembly.
Maintenance Specifications & Fluids
For optimal performance, MotoSpecsLab recommends using SAE 10W-30 oil meeting API SG or higher and JASO MA standards. Note the distinct capacities: 0.69 Liters for the engine side and 0.60 Liters for the transmission. Overfilling or using friction-modified oils in the transmission side can lead to clutch slippage and premature wear.
The ignition system relies on the high-performance NGK IMR8C-9H iridium plug, which offers superior fouling resistance in the variable RPM conditions typical of trail riding. Electrical starts are powered by the compact YTZ7S battery, which must be maintained with a smart charger during off-season periods to ensure the longevity of the starter motor.
Chassis and Tire Configuration
The ME11A/B/11 utilizes an 18-inch rear wheel (100/100-18) to provide a larger sidewall profile, which aids in traction over roots and rocks compared to the 19-inch wheels found on MX models. The front 80/100-21 tire ensures precise steering. Both should be set to 1.0 bar (15 psi) for standard trail conditions, though riders may drop to 12 psi for extreme technical terrain.
Frequently Asked Questions
How often should I change the oil on a CRF 250 X?
Under competition or hard trail use, engine oil and the filter should be changed every 15 hours. For casual trail riding, this can be extended to 25-30 hours, but always check levels before every ride due to the small oil capacity.
Why does the CRF 250 X have two separate oil compartments?
This design prevents the clutch material from circulating through the engine’s precision bearings and top end, significantly increasing the lifespan of the engine components in a high-revving four-stroke environment.
What is the benefit of the NGK IMR8C-9H iridium plug?
The iridium construction allows for a finer center electrode, requiring less voltage to spark, which improves starting performance—especially critical when using the electric start in cold conditions.