| Component | Specification |
|---|---|
| Model Year | 2017-2018 |
| Engine Oil | SAE 10W-30 API SG JASO MA (0.69 L Engine / 0.67 L Transmission) |
| Spark Plug | NGK IMR8C-9H (Iridium) |
| Battery | YTZ7S (Sealed Lead Acid) |
| Front Tire | 80/100-21 51M (1.0 bar / 15 psi) |
| Rear Tire | 120/90-18 65R (1.0 bar / 15 psi) |
The Honda CRF 250 XRL is a masterclass in specialized engineering, specifically designed to bridge the gap between a closed-course competition machine and a road-legal enduro. Unlike the standard ‘X’ model, the ‘XRL’ variant features a factory-backed road conversion kit that includes a modified wiring loom, lighting, and speedometer, making it one of the few high-performance Unicam engines optimized for dual-environment durability.
Engineering Profile: The Unicam Advantage
At the heart of the CRF250XRL/18 is Honda’s signature Unicam four-valve engine. This design utilizes a single overhead camshaft to directly actuate the intake valves, while using a forked roller rocker arm for the exhaust valves. This configuration provides the weight savings of a SOHC design with the high-RPM performance typically reserved for DOHC layouts. For the 2017-2018 models, the focus remained on linear power delivery and torque, essential for technical trail navigation.
Maintenance Protocols
Lubrication System
The CRF 250 XRL utilizes a twin-sump lubrication system. This separates the engine oil from the transmission oil, preventing clutch debris from contaminating the crankshaft and piston skirts. It is critical to use SAE 10W-30 API SG JASO MA oil. The engine side requires 0.69 Liters, while the transmission side requires 0.67 Liters. Frequent oil changes are mandatory for this high-string machine, typically every 15-20 hours of hard off-road use.
Ignition and Electrical
The 2018 model utilizes a high-performance NGK IMR8C-9H Iridium spark plug. This plug is chosen for its superior heat dissipation and consistent spark under high-compression loads. The electrical system is supported by a YTZ7S battery, which provides the necessary cold-cranking amps for the electric starter while maintaining a lightweight profile.
Chassis and Handling
The 18-inch rear wheel (120/90-18) distinguishes the XRL from its motocross cousins, offering a larger sidewall for better traction over roots and rocks. Both the front (80/100-21) and rear tires should be maintained at 1.0 bar (15 psi) for standard enduro conditions. Adjusting these pressures by +/- 2 psi can significantly alter the footprint based on terrain density.
Editor’s Verdict
The Honda CRF 250 XRL remains a benchmark for reliability in the 250cc enduro class. Its street-legal status does not compromise its racing pedigree. For owners, the key to longevity lies in the strict adherence to the twin-sump oil maintenance and ensuring the Iridium plug is inspected for carbon fouling after technical low-speed sections.