| Component | Specification |
|---|---|
| Model Generation | PE07A/L (2017–2020) |
| Engine Oil | SAE 10W-30 JASO T 903 MA (Moly-Free) |
| Oil Capacity | 1.04 L |
| Tires (Front/Rear) | F: 80/100-21 51M / R: 120/80-19 63M |
| Tire Pressure | 1.0 bar (15 psi) [Standard] |
| Battery | Eliiy Power HY85S (Lithium-Ion) |
| Spark Plug | NGK SILMAR9A9S |
Engineering Highlight: The ‘Absolute Holeshot’ Philosophy
The PE07A/L generation of the Honda CRF 450 R represents a pivotal moment in motocross engineering. Historically, the 2017 redesign marked Honda’s aggressive return to the ‘Absolute Holeshot’ philosophy. It was the first production Honda motocrosser to abandon the KYB PSF2 air forks in favor of the 49mm Showa coil-spring ‘A-Kit’ style forks, a direct response to professional rider feedback seeking more consistent damping performance throughout a moto. This era also introduced the downdraft intake layout, significantly increasing charging efficiency and top-end power.
Technical Performance Analysis
Under the PE07 chassis, the Unicam® engine architecture was refined to reduce reciprocating mass. The 2017-2020 window saw the introduction of the first factory electric start (standardized in later years of this range), powered by the ultra-lightweight Eliiy Power HY85S lithium-ion battery. This transition required a complete overhaul of the electrical system and a move toward more compact, high-output charging systems to maintain weight parity with kick-start competitors.
Maintenance Protocols for the PE07A/L
To maintain the high-performance thresholds of the CRF 450 R, strict adherence to fluid specifications is mandatory. At MotoSpecsLab, we emphasize the use of SAE 10W-30 JASO T 903 MA oil. It is critical to use a ‘Moly-Free’ variant (often identified by Honda’s gold bottle) to prevent clutch slippage, as this engine utilizes a shared sump system where the engine oil also lubricates the clutch plates.
The ignition system relies on the NGK SILMAR9A9S laser iridium plug. This specific plug features a long-reach design and a fine-wire tip to ensure stable combustion under the high-compression (13.5:1) environment of the PE07 engine. For traction management, the standard 1.0 bar (15 psi) pressure setting provides a baseline, though professional tuners may adjust +/- 2 psi depending on track density.
Expert FAQ
Why is ‘Moly-Free’ oil required?
Molybdenum additives are friction modifiers. While excellent for engine longevity, they can cause the wet clutch of the CRF 450 R to slip, leading to premature wear and power loss.
Can I use a lead-acid battery as a replacement?
The PE07A/L is designed specifically for the Eliiy Power HY85S Lithium-Ion battery. Using a standard lead-acid battery is not recommended due to weight distribution issues and potential charging system incompatibility.
What is the torque benefit of the 120/80-19 rear tire?
The 120-section rear tire provides a larger contact patch for the 450cc’s massive torque output, improving ‘hook-up’ on exit corners compared to the smaller 110-section tires used on 250cc models.