| Quick Specs: RM-Z 450 (2018) | |
|---|---|
| Engine Type | 449cc, 4-stroke, liquid-cooled, DOHC |
| Oil Capacity | 1.1 L (SAE 10W-40 JASO MA) |
| Spark Plug | NGK DIMR8B10 |
| Tire Size (F/R) | 80/100-21 / 110/90-19 |
| Tire Pressure | 1.0 bar (15 psi) |
| Starting System | Kick-start with Capacitor |
The 2018 Suzuki RM-Z 450 (DZ117Z/L8) marked a pivotal shift in Suzuki’s motocross engineering philosophy. Notably, it was the first production motocross motorcycle to implement the Showa Balance Free Rear Cushion (BFRC) shock technology. Derived directly from Suzuki’s success in MotoGP and World Superbike racing, the BFRC design separates the damping force generation from the piston movement, resulting in significantly smoother oil flow and improved traction over harsh braking bumps.
Engine Performance and Electronics
At the heart of the L8 model is a refined 449cc fuel-injected engine. While maintaining its reputation for linear power delivery, the 2018 revision focused on the Suzuki Holeshot Assist Control (S-HAC) system. This system allows riders to choose between different ignition timing maps to optimize launch performance based on gate conditions. Unlike many of its competitors that moved to electric start, Suzuki opted to retain the kick-starter to minimize weight, utilizing a high-output capacitor to provide the necessary electrical surge for the fuel injection system upon the first stroke.
Maintenance Essentials
To maintain peak performance of the DZ117Z powerplant, strict adherence to lubricant specifications is mandatory. The engine requires 1.1 liters of SAE 10W-40 oil. It is critical to use oil meeting JASO MA standards to ensure the wet clutch system operates without slippage. For ignition, the high-performance NGK DIMR8B10 spark plug is specified; its heat range and electrode design are specifically tuned for the high-compression environment of the L8 cylinder head.
Chassis and Handling
The 2018 frame was redesigned to be lighter and more rigid than previous iterations, enhancing Suzuki’s legendary ‘corner-at-all-costs’ handling characteristics. The factory tire fitment consists of an 80/100-21 front and a 110/90-19 rear. For optimal contact patch stability and rim protection, a standard pressure of 1.0 bar (15 psi) is recommended for both front and rear under typical track conditions.
Technical FAQ
What is the benefit of the DIMR8B10 spark plug?
The NGK DIMR8B10 is an Iridium-Platinum plug designed for high durability and consistent spark under the extreme cylinder pressures of a race-tuned 450cc engine.
Why is there no battery on this model?
Suzuki engineers prioritized weight savings. By using a capacitor instead of a lead-acid or lithium-ion battery, the bike remains lighter while still providing the voltage needed to prime the EFI system during a kick-start.