| Specification | Data |
|---|---|
| Model / Generation | Yamaha WR 450 F – RE451W/2GC8 (2016–2018) |
| Engine Oil | Yamalube 4 (10W-40); API SG or higher, JASO MA (0.7 L) |
| Spark Plug | NGK LMAR8G |
| Battery | YTZ7S |
| Tires (F/R) | 80/100-21 51M / 120/90-18 65M |
| Tire Pressure | F: 1.0 bar (15 psi) / R: 1.0 bar (15 psi) |
Engineering Highlight: The 2016 introduction of the RE451W platform marked a watershed moment for Yamaha’s enduro lineup. It was the first WR 450 F to adopt the revolutionary “reverse-cylinder” head and rearward-slanting engine architecture originally developed for the YZ450F motocrosser. This design flips the traditional intake and exhaust positions, placing the airbox up high and forward, which drastically improves mass centralization and provides a straighter, more efficient downdraft intake path.
Technical Review
The RE451W/2GC8 generation brought the WR 450 F into the modern era of competition-level enduro performance. By utilizing the YZ450F frame and engine base, Yamaha delivered a machine that possessed motocross-level agility but with the linear power delivery required for technical off-road trails. The inclusion of the KYB® Air-Oil Separate (AOS) front forks provided a level of suspension refinement that became the benchmark for the class.
Equipped with a Keihin 44mm fuel injection system, the 2016–2018 models offered crisp throttle response regardless of altitude or temperature. For the enduro enthusiast, the wide-ratio five-speed transmission and the addition of an electric starter (retaining the kickstarter for backup) made it one of the most versatile open-class machines on the market.
Maintenance Guide
Engine Lubrication
The WR 450 F is a high-performance racing engine with a relatively small oil capacity of 0.7 liters. To maintain peak performance and protect the titanium valves, MotoSpecsLab recommends using Yamalube 4 (10W-40) meeting JASO MA standards. Given the small volume, frequent oil changes are critical, especially after high-intensity trail rides or race conditions.
Ignition and Electrical
The NGK LMAR8G spark plug is the specific long-reach plug designed for this cylinder head’s cooling jacket configuration. Ensure the gap is checked regularly. For the electrical system, the YTZ7S battery provides the necessary cranking amps for the electric start system while keeping weight to a minimum.
Chassis and Tires
The factory tire fitment consists of an 80/100-21 front and a 120/90-18 rear. For optimal traction in varied enduro terrain, Yamaha specifies a standard pressure of 1.0 bar (15 psi) for both ends. Riders may adjust this slightly based on terrain (down to 12 psi for soft mud or sand), but caution should be exercised to avoid rim damage.
Final Verdict
The Yamaha WR 450 F (RE451W) remains a pinnacle of mechanical reliability in the 450cc enduro segment. Its transition to the reverse-cylinder layout solidified its reputation for handling balance. For the owner, adhering to the strict 0.7L oil service interval is the single most important factor in ensuring the longevity of this high-strung, competition-bred powerplant.