| Feature | Specification |
|---|---|
| Model Designation | DR-Z 4SM (DRZ4SM/25) |
| Production Years | 2025–Present |
| Engine Type | 398cc Liquid-cooled DOHC Single |
| Oil Requirement | SAE 10W-40 JASO MA2 (1.9 L) |
| Spark Plug | NGK CPR8EB-9 |
| Battery | FTZ7S |
| Front Tire | 120/70R17M/C 58H (25 psi) |
| Rear Tire | 140/70R17M/C 66H (29 psi) |
The Suzuki DR-Z 4SM (DRZ4SM/25) marks a historic turning point for the legendary DR-Z lineage. While the previous generation remained largely unchanged for over two decades, the 2025 model introduces a complete overhaul of the fueling and electronics system. Notably, it is the first DR-Z to utilize a dual-injector electronic fuel injection (EFI) system paired with the Suzuki Intelligent Ride System (S.I.R.S.), representing a significant engineering leap to meet stringent Euro 5+ emissions standards without sacrificing its signature torque-rich character.
Technical Engineering Analysis
At the heart of the DRZ4SM/25 is a redesigned 398cc DOHC engine. While the displacement remains familiar, the internal architecture has been refined for modern efficiency. The transition from the venerable Mikuni carburetor to a 42mm bore throttle body has drastically improved throttle response and cold-start reliability. The inclusion of the Suzuki Drive Mode Selector (SDMS) and a multi-mode Traction Control System allows for a level of precision previously unavailable in the supermoto segment.
Maintenance Guide: Professional Specifications
Maintaining the DR-Z 4SM is critical for longevity, especially given its high-revving single-cylinder nature. For standard oil changes, the system requires 1.9 Liters of SAE 10W-40. It is imperative to use oil meeting JASO MA2 standards to ensure the wet clutch operates without slippage under high-load supermoto riding conditions.
The ignition system relies on a high-precision NGK CPR8EB-9 spark plug. Given the lean-burn characteristics of the new EFI system, checking the plug gap and heat range regularly is essential for preventing pre-ignition. Power is supplied by a compact FTZ7S battery, chosen for its high cold-cranking amps in a lightweight footprint.
Chassis & Wheel Dynamics
The DR-Z 4SM utilizes a 17-inch wheel configuration optimized for street performance. The tire setup features a 120/70R17M/C 58H in the front and a 140/70R17M/C 66H in the rear. To maintain the ideal contact patch and prevent overheating during aggressive cornering, technicians should adhere to the factory-specified pressures of 1.75 bar (25 psi) for the front and 2.00 bar (29 psi) for the rear.
Expert Verdict
The DRZ4SM/25 is a masterclass in modernizing a classic. By retaining the robust mechanical foundation that made the original DR-Z 400SM a cult favorite and overlaying it with sophisticated electronic controls, Suzuki has created a machine that is both familiar and revolutionary. For the owner, following the precise maintenance intervals outlined in this guide is the key to preserving the performance of this next-generation supermoto.