| Specification | Data |
|---|---|
| Model Series | Honda CRF 250 RX – ME12A/L/RX/21 |
| Production Years | 2022 – Present |
| Engine Oil | SAE 10W-30 JASO MA (1.05 L) |
| Tires (Front/Rear) | F: 80/100-21 51M / R: 110/100-18 64M |
| Tire Pressure | F: 1.0 bar (15 psi) / R: 1.0 bar (15 psi) |
| Battery | HY85S (Lithium-Ion) |
| Spark Plug | NGK SILMAR9A9S |
Engineering Highlight: The Weight-Loss Revolution
The 2022+ Honda CRF 250 RX (ME12 platform) represents a significant engineering shift in Honda’s off-road philosophy. Most notably, this generation adopted the frame and swingarm directly from the championship-winning CRF450R. This move, combined with the transition from a dual-exhaust system to a single-muffler setup, allowed the machine to shed approximately 3 kilograms (6.6 lbs) compared to its predecessor. This weight reduction was specifically tuned to improve lateral rigidity and cornering agility for GNCC-style closed-course racing.
Technical Review: Performance and Chassis
At the heart of the ME12 is a 249cc liquid-cooled single-cylinder DOHC engine. For the 2022 redesign, Honda engineers focused heavily on low-to-mid range torque, a vital requirement for technical woods riding. The airbox volume was increased by 78%, and the fuel injector angle was optimized to 60 degrees to improve intake efficiency. Unlike the ‘R’ motocross variant, the ‘RX’ features dedicated ECU mapping, an 8-liter fuel tank, and an 18-inch rear wheel to provide the compliance needed for rocky terrain.
Maintenance Guide & Technical Requirements
Lubrication System
For the ME12 series, Honda specifies 1.05 Liters of SAE 10W-30 JASO MA oil. Due to the high-revving nature of the Unicam/DOHC valvetrain, regular oil changes are critical. MotoSpecsLab recommends changing the oil every 7.5 to 15 hours of operation depending on race intensity.
Ignition and Electrical
The machine utilizes the NGK SILMAR9A9S laser iridium spark plug. This plug is designed to withstand the high combustion pressures and temperatures of a race-tuned 250cc four-stroke. The electrical system is powered by a lightweight HY85S Lithium-Ion battery; standard lead-acid chargers should never be used, as they can damage the internal cells.
Tires and Traction
The RX comes stock with an 18-inch rear wheel, a staple for off-road durability. The recommended pressures are 1.0 bar (15 psi) for both front and rear. However, for technical hard-enduro sections, riders may drop the rear pressure to 0.8 bar (12 psi) provided heavy-duty tubes or mousses are installed.
Frequently Asked Questions
What is the benefit of the single exhaust on the ME12?
The single exhaust reduces weight and allows for a narrower body profile, making it easier for the rider to move on the bike during technical maneuvers.
Can I use 10W-40 oil?
While 10W-40 can be used in hotter climates, Honda’s factory recommendation for optimal flow and protection in the ME12 engine is 10W-30 JASO MA.