| Component | Specification |
|---|---|
| Model Generation | DJ031 / 1DX6 (2012–2015) |
| Engine Oil | SAE 10W-40 API SG+, JASO MA (0.95 L) |
| Spark Plug | NGK LMAR8G |
| Battery | YTZ7S |
| Tire Size (Front/Rear) | 80/100-21 51M / 120/90-18 65M |
| Tire Pressure | 1.00 bar (15 psi) Front & Rear |
The 2012 introduction of the Yamaha WR 450 F (DJ031/1DX6) represented a watershed moment in enduro engineering. While its predecessors relied on the wide, traditional aluminum frame, this generation famously adopted the compact YZ250F-derived Bilateral Beam aluminum frame. This engineering pivot allowed Yamaha to house the 450cc powerplant in a chassis with 250cc-class dimensions, fundamentally altering the bike’s flickability and ergonomics for technical single-track riding.
Technical Analysis: The EFI Revolution
The DJ031 model was the first WR 450 F to feature Electronic Fuel Injection (EFI). Utilizing a 42mm Keihin throttle body, the system provides instantaneous throttle response and automatic altitude compensation, a critical feature for enduro riders traversing varying elevations. The engine remains the legendary 5-valve (Titanium) DOHC design, known for its linear power delivery and exceptional top-end durability.
Maintenance Guide & Fluid Specifications
To maintain the high-performance standards of the 1DX6 series, adherence to strict fluid intervals is mandatory. The engine utilizes a semi-dry sump system, requiring exactly 0.95 Liters of oil when changing the filter. MotoSpecsLab recommends a high-shear SAE 10W-40 JASO MA oil to protect both the high-revving valvetrain and the wet clutch assembly.
Ignition and Electrical
The electrical system is anchored by a YTZ7S battery. Given the EFI’s reliance on stable voltage, ensuring the health of this compact battery is paramount. For combustion, the NGK LMAR8G spark plug is specified; its long-reach design is optimized for the 5-valve cylinder head’s heat dissipation requirements.
Chassis and Footwear
For optimal traction and rim protection in off-road environments, the factory recommends a tire pressure of 1.00 bar (15 psi) for both the 21-inch front and 18-inch rear wheels. This pressure provides the necessary footprint for the 120/90-18 rear tire to bite into loose terrain while preventing pinch flats on the 80/100-21 front.
MotoSpecsLab Verdict
The DJ031/1DX6 generation is widely considered the “sweet spot” for riders who value the reliability of the 5-valve head combined with the modern handling of a narrow chassis. It bridges the gap between the carbureted era and the later rearward-slanted engine designs, offering a balanced, high-torque experience that remains competitive in modern enduro circuits.
Frequently Asked Questions
Q: How often should the oil be changed?
A: For competition use, every 5-10 hours; for recreational trail riding, every 500-800 km is recommended.
Q: Can I use 10W-50 oil?
A: Yes, in hotter climates, a JASO MA 10W-50 is acceptable to maintain viscosity under extreme thermal loads.