| Feature | Specification |
|---|---|
| Model Code | RL42A / L6 (2016) |
| Engine Oil | SAE 10W-40 API SF/SG or SH/SJ (JASO MA) |
| Oil Capacity | 1.15 Liters |
| Tires (F/R) | 80/100-21 51M / 110/90-19 62M |
| Tire Pressure | 1.0 bar (15 psi) Front & Rear |
| Spark Plug | NGK R0452A-10 |
The 2016 Suzuki RM-Z 450 (RL42A/L6) occupies a significant place in motocross history as a refined iteration of the platform that pioneered electronic fuel injection in the production 450cc class. A standout engineering highlight of the L6 model is the evolved Suzuki Holeshot Assist Control (S-HAC), a selectable launch mode system that adjusts ignition timing to optimize traction based on gate conditions—a direct trickle-down from the factory racing division.
Technical Review: Precision and Performance
The RL42A/L6 is defined by its “Winning Balance” philosophy, focusing on cornering performance that remains the benchmark for the class. The 449cc liquid-cooled DOHC engine is tuned for a broad spread of power, utilizing a 5-speed constant mesh transmission. For the 2016 model year, Suzuki engineers focused on weight reduction and chassis rigidity, ensuring the bike maintained its legendary turn-in precision.
Suspension duties are handled by the Showa SFF-Air (Separate Function Front Fork) Triple Air Chamber (TAC). This system replaces traditional coil springs with compressed air, allowing for highly granular tuning to rider weight and track conditions without internal hardware changes. However, this requires diligent maintenance and precise pressure monitoring to perform optimally.
Maintenance Guide & Essentials
To maintain the high-performance threshold of the RM-Z 450, strict adherence to the lubrication and ignition schedules is mandatory.
Lubrication System
The engine requires 1.15 liters of high-quality synthetic or semi-synthetic oil. We recommend SAE 10W-40 meeting JASO MA standards to ensure the wet clutch operates without slippage. Given the high-revving nature of the RL42A, oil should be inspected after every ride and changed every 5-10 hours of competitive use.
Ignition and Spark
The L6 utilizes a specialized NGK R0452A-10 spark plug. This is a high-performance racing plug designed to withstand the extreme cylinder pressures and temperatures of the high-compression 450cc engine. Ensure the gap is checked according to factory service manuals to prevent misfires under load.
Tires and Traction
The factory-recommended tire setup features an 80/100-21 front and 110/90-19 rear. For standard motocross applications, a pressure of 1.0 bar (15 psi) is the baseline. Adjustments of +/- 2 psi may be necessary depending on the terrain (sand vs. hard-pack).
Frequently Asked Questions
What is the recommended oil for the RM-Z 450 L6?
Use SAE 10W-40 API SF/SG or SH/SJ with a JASO MA rating. The total capacity is 1.15 liters.
What are the tire pressure settings?
The standard operating pressure is 1.0 bar (15 psi) for both the front and rear tires.
Does the 2016 model have a battery?
No, the 2016 RM-Z 450 (RL42A/L6) utilizes a kick-start system with a magneto-powered EFI, eliminating the need for a heavy lead-acid or lithium battery.