Motorcycle specifications SuzukiRM-Z 250 2021 Performance azimuths

Based on the philosophy of "ROLL. ROLL. BRAKE" philosophy, the factory engineers set out to make the RM-Z 250 a formidable competitor.
The Suzuki has always been one of the best-handling 250s on the track. Powered by a dual-injector electronic fuel injection system, a central-port cylinder head and a high-performance exhaust system, the RM-Z 250's engine produces solid, usable power throughout the rev range. To fine-tune engine settings, the MX Tuner 2.0 comes as standard.

The twin-spar aluminum frame and hydroformed swingarm carry KYB-supplied suspension, which includes a coil-sprung fork and shock absorber with four damping force settings. Powerful brakes and ergonomic bodywork keep the RM-Z 250 under control as it takes to the track.

faster, higher, stronger.

Motocross is a relentless business, and so is the technology and training needed to ensure that both rider and bike can excel. Suzuki has invested more than 40 years of specialized open-category racing bike engineering into the RM-Z 250, making it the strongest, most precise, balanced and rider-friendly production motocross bike in the company's history.

engine features

- Equipped with a central-port cylinder head, the 249 cm³ liquid-cooled, four-valve, DOHC, fuel-injected four-stroke engine is reliable and well-proven.
- This engine offers increased maximum power and excellent throttle response throughout the rev range.
- The cylinder head features a refined intake port and finish that fine-tunes the air-fuel mixture in the combustion chamber to increase the engine's power output.
- A large air filter opening is combined with a more direct passage of the air filter outlet tube into the throttle body for high air flow.
- The fuel injection system produces very smooth power delivery, high fuel efficiency, superb reliability and easy tuning capability.

increased power at all engine speeds

- The dual fuel injector system is used to ensure excellent combustion chamber efficiency and increased power at high engine speeds.
- The primary fuel injector is located at the bottom of the throttle body and sprays fuel at the throttle for exceptional atomization of fuel and air. The secondary injector is located in the air filter inlet duct, giving the fuel and air more time to mix and cool before entering the engine.
- The intake camshaft profile features higher valve lift than the previous generation RM-Z 250, increasing power at all engine speeds.
- The compact aluminum cylinder is coated with Suzuki Electrochemical Composite Coating (SCEM) for durability, lightness and efficient heat transfer.
- Starting the engine remains simple thanks to a proven electric starter and an automatic decompression system that operates precisely and efficiently (eliminating the need for a heavy, expensive electric starting system).
- The high-flow exhaust system features a longer head pipe, a tapered middle section and a multi-layer muffler, delivering good flow throughout the rev range, with an emphasis on low-end performance.

electronic system

traction Control

The RM-Z250 features a fast, advanced traction management system that reacts quickly to changes in engine speed. The Electronic Control Module (ECM) continuously measures throttle opening, engine speed and gear position, then adjusts ignition timing and fuel injection duration to fine-tune engine power to provide the best possible traction for different riding conditions.
- The RM-Z250's traction management system differs from that of a street bike in that it does not measure rear-wheel slip. Because the needs of a motocross motorcycle differ from those of a street bike, this system offers constant adjustments that maximize traction at all times.
Adjusting the Electronic Fuel Injection System
Suzuki's proven, easy-to-use fuel couplers are also included to simplify adjustment of the electronic fuel injection system.
- For quick fuel adjustments to suit driving conditions, two couplers are supplied. One for the richer fuel setting and the other for the leaner fuel setting. Drivers can change fuel settings in seconds simply by connecting either coupler to the wiring harness.

holeshot Start Assistant

The Suzuki Holeshot Electronic Start Assistant (S-HAC) is a mode-selective system derived from the factory race bike to help the rider get to the front right from the start of the grid.
* To assist the rider at the start, the S-HAC system offers three stages of power adjustment: 1) moment of initial start, 2) exit from the starting grid, and 3) acceleration to full speed.
Modes
Drivers and non-drivers can choose from two S-HAC modes, depending on their skill level and starting conditions.
Mode A: For hard surfaces or slippery conditions at the starting grid. In this mode, the S-HAC system modifies the ignition timing at the start of the grid to reduce wheel slip and promote smooth acceleration. It also advances the ignition timing during this sequence for more intense acceleration. After six seconds, or when shifting into fourth gear, the system switches off and ignition timing returns to normal.
- Mode A advantage: For novice riders and difficult or slippery conditions, mode A offers a more controlled start.
Mode B: When grid conditions offer better traction and a more spirited start is desired. The S-HAC system advances the ignition timing to enable better throttle response and more pronounced acceleration at the start. Ignition timing alternates in a sequence similar to mode A, but with increased overall timing. One of the following three conditions returns the ignition to normal operation (whichever occurs first): After six seconds, or when shifting into fourth gear, the system switches off and ignition timing returns to normal.
- B mode advantage: For experienced riders or ideal starting conditions, B mode offers a more spirited start.
Basic mode: Standard starting power, no S-HAC button actuation required.

mX Tuner 2.0

Because good track performance depends on precise tuning, Suzuki now offers MX Tuner 2.0 as standard on the RM-Z250. Developed in collaboration with GET, MX Tuner enables optimum tuning of fuel injection via an app to be downloaded to a smartphone or tablet. By default, four types of maps are offered to the user, enabling easy changes of settings and serving as a basis for the user to follow his or her skills and preferences.

The injection and ignition maps have an adjustable range of 36 points to best match the user's riding style: from -10% to +20% for injection, and from -12 to +3 degrees for ignition. This information is sent to the RM-Z unit via wireless communication, when connected to an exclusive coupler installed on the machine and powered by a 12V battery.

Data for management, reception, preparation and editing is available on the box.

chassis features

- The RM-Z250 features a frame and swingarm that continue Suzuki's reputation for creating the best-handling motocross bikes.
- This aluminum-alloy twin-spar frame combines cast and extruded sections to achieve superior weight distribution front and rear, while balancing strength and weight.
- The RM-Z 250 2022 frame is 370 grams lighter, but its torsional rigidity has increased by 10% compared to the previous-generation frame.
- The location of the engine in the frame is turned upwards, so that the crankshaft sits higher in the frame to enrich the bike's handling characteristics.
- The upper rear engine mounts are located outside the cylinder head to increase rigidity and allow a direct intake path to the engine.

part-cycle

- The engine mount is made of aluminum, rather than steel, to reduce weight.
- The swingarm, shaped using an innovative hydroforming process that preserves its strength, weighs just 270 grams.
- The shock absorber supplied by KYB features a fine-wire spring, a spring guide, a cushioned rubber guide and a lightweight lower transmission for improved response to movement. The spring and transmission weigh 447.5 grams less than the previous generation.
- This KYB shock absorber features specialized damping force circuits and a refined rear gear ratio to enhance the suspension's traction characteristics.
- KYB's high-performance coil-sprung front fork features lugs with the same springs and damping components, allowing easy balancing and maintenance of the front suspension: an important advantage on frequent trips.
- This fork uses a free piston that separates air and oil to optimize damping characteristics. The design also helps reduce damping cartridge pressure and spring recoil, so fork action remains smooth and precise.
- The Renthal tapered aluminum handlebar features a flatter curve and lower recoil than previous models to help the rider maintain control during aggressive maneuvers.
- To enhance braking performance and feel, a 270mm-diameter wave-style front brake disc and Nissin two-piston caliper are used.
- The wheels feature black anodized D.I.D. Dirt Star cross-cut rims that maintain strength while reducing unsprung weight.
- To match the handling potential of the RM-Z 250, the wheels are fitted with Dunlop Geomax MX33 racetrack tires.
- Compared to the previous RM-Z 250, the current edition features ergonomic improvements thanks to the new bodywork; the rider's footrests are moved forward by 3.3 mm and upward by 5.2 mm, while the location of the handlebar grips is moved forward by 7.4 mm and downward by 3.8 mm, to create a high level of rider control during competition.
- The plastic fuel tank weighs 226 grams less than the aluminum tank on the previous model. Fuel capacity is 6.3 L.

Information and images: Suzuki