The choice of wise
professionals and privateers everywhere, the 2021 RM-Z250 is ready for
battle. The agile RM-Z250 combines the sleek, race-ready appearance of
the RM-Z450 with a versatile engine and responsive chassis to deliver
superior performance. Using Suzuki's “RUN, TURN and STOP" philosophy,
factory engineers have made the RM-Z250 a formidable competitor.
The RM-Z250 has always set the standard as the best handling 250
on the track. Fed by a dual injector EFI system, a center-port cylinder
head and an AMA-compliant exhaust, the RM-Z250's engine delivers
strong, usable power through the entire rev-range.
The twin-spar aluminum frame and hydro-formed swingarm carry a
KYB-supplied suspension that includes a coil spring fork and a shock
with four-way damping force adjustment. Strong brakes and ergonomically
shaped bodywork that helps keep the rider in control as the RM-Z250
carves up the racetrack.
Tuning the fuel injection and ignition for maximum performance
is easy thanks to Suzuki's smartphone-based MX-Tuner 2.0 and proven
fuel-coupler system. Suzuki's Winning Balance is on display with the
2021 RM-Z250 as it maintains its own high standard for cornering
performance.
Key Features
- Superb
Engine Performance- Center-port cylinder head increases output and
throttle response- Dual fuel injector system boosts high rpm power-
Traction management system helps the bike hook up- Suzuki Holeshot
Assist Control (S-HAC) gets you out front
- Exceptional
Cornering Performance- Frame and swingarm balances lightness with
strength- Engine placement and mounting aid chassis' nimble handling-
Coil spring KYB fork provides outstanding performance and easy tuning-
KYB rear shock and linkage deliver remarkable control- Race-ready,
high-grip Dunlop MX33 tires
- Controlled
Braking Performance- Large-diameter front brake increases stopping
power and feel- Compact rear master cylinder is designed to prevent mud
from collecting on it and from catching on the rider's boots
- Functional
Styling- Aggressive new styling from the championship caliber RM-Z450-
Narrow cockpit lets rider move with ease for maximum racing performance
- Rider-friendly
Tuning- Suzuki's MX-Tuner 2.0 is supplied, providing quick fuel
injection and ignition tuning through an easy-to-use smart-phone
application. - Fuel couplers are also included for quick and easy EFI
tuning
Engine Features
- Fitted
with a center-port cylinder head, the fuel-injected, 249cc,
liquid-cooled, four-stroke, four-valve, DOHC engine remains proven and
reliable.
- The engine delivers strong peak power and superb throttle response through the entire rev range.
- The
cylinder head features a refined intake port shape and finish that
fine-tunes the fuel/air charge into the combustion chamber to increase
engine output.
- A large air
cleaner opening is combined with a more direct air cleaner outlet tube
path into the throttle body for high-volume air flow.
- The fuel injection system has extra-smooth power delivery, high fuel efficiency, superb reliability, and easy tuning capability.
- First
introduced on the RM-Z250, twin fuel injectors are used to deliver
excellent combustion chamber efficiency and increases high rpm power.
- The
primary fuel injector is at the bottom of the throttle body and sprays
fuel at the butterfly valve for outstanding fuel and air atomization.
The secondary injector is positioned in the air cleaner inlet duct so
the fuel and air have more time to mix and cool before entering the
engine.
- To feed the new
twin-injector system and mix the fuel and air charge for outstanding
throttle response, the RM-Z250 uses a high-capacity fuel pump.
- The
special design of the throttle body eliminates complex control linkage,
so the rider feels a more direct connection to the engine.
- The intake camshaft profile has more valve lift that the prior generation RM-Z250, increasing power at all engine speeds.
- The cam chain tension adjuster and guide have been designed to reduce friction and mechanical loss.
- The
compact aluminum cylinder is finished with Suzuki Composite
Electrochemical Material (SCEM) coating for durability, light weight,
and efficient heat transfer.
- The machining process at the piston pin holes is changed to reduce stress at the piston crown to increase reliability.
- Engine
starting remains simple, due to a proven kickstarter and automatic
decompression system that works precisely and efficiently (eliminating
the need for a heavy and costly electric start system).
- The
high-flow exhaust system has a longer head-pipe, tapered mid-section,
and multi-layer silencer with good flow through the entire rev range,
with an emphasis on low-rpm performance.
- The exhaust silencer is a four-layer design that enhances performance and maintains compliance with AMA sound regulations.
- The
resin engine protectors help guard the coolant pump (on the right) and
the stator cover (on the left) from debris and stones.
Advanced Electronics Features
- Included
with the 2021 RM-Z250 is Suzuki's MX-Tuner 2.0 that provides the
ability to easily adjust the fuel injection and ignition system settings
for optional race performance.- Using a smartphone application that
wirelessly connects to the MX-Tuner's compact transceiver, fuel delivery
and ignition timing can be quickly changed.- The MX-Tuner application
can pre-program personalized settings into the ECM that can be activated
by plugging in one of the supplied fuel couplers.- Racers and tuners
can easily change settings to match performance-related updates.- The
application can save a number of settings for different tracks or
weather conditions, plus settings can be exchanged with other racers.-
Real-time engine data and run-time information are accessible to help
you stay on top of bike maintenance.
- Suzuki's
proven, easy-to-use fuel couplers are also included to simplify EFI
tuning.- For quick fuel adjustments to suit riding conditions, two
couplers are provided. One is for a richer-than-stock and another for a
leaner-than-stock fuel setting. Riders can change fuel settings in
seconds by simply connecting either coupler to the wire harness.
- The
RM-Z250 features an evolved and faster traction management system that
reacts to engine speed changes quickly. The Electronic Control Module
(ECM) continually measures throttle opening, engine speed, and gear
position, and then adjusts the ignition timing and fuel injector
duration to fine-tune the engine output to deliver the best traction for
the riding conditions.- The RM-Z250's traction management system is
different from a street bike traction control system, as it does not
measure rear tire spin. Because the needs of a motocrosser are different
than a street bike, this system offers constant adjustment that
maximizes traction at all times.
- The
Suzuki Holeshot Assist Control (S-HAC) is a selectable launch system
derived from the factory race bike to help riders' takeoff from the
starting gate for an early lead.- To aid riders at the moment of launch,
there are three stages of power adjustment from the S-HAC system: 1)
the moment of initial launch, 2) when crossing the starting gate, and 3)
acceleration up to full-speed.
- There
are three S-HAC modes riders can choose for the best option per their
skill level and starting conditions.Mode A: For hard surfaces or
slippery conditions at the starting gate. In this mode, S-HAC alters
ignition timing at the moment of launch and the ride over the gate to
reduce wheel slip to deliver a smooth takeoff. It also advances ignition
timing during this sequence for stronger acceleration. After six
seconds or when you reach fourth gear, the system shuts off and returns
to normal ignition timing.- Benefit of Mode A: For novice riders, and/or
hard and slippery traction conditions, use Mode A for a more controlled
launch.Mode B: When conditions at the starting gate have better
traction, and a more aggressive launch is desired. S-HAC will advance
the ignition timing to allow increased throttle response and stronger
acceleration off the line. The ignition timing alternation is in a
similar sequence as Mode A, but with increased overall timing. One of
three conditions will return the ignition to normal operation (whichever
happens first): After six seconds or when you reach fourth gear, the
system shuts off and returns to normal ignition timing.- Benefit of Mode
B: For skilled riders, and/or good starting conditions, use Mode B for a
more aggressive launch.Base Mode: Standard power launch, no action
required on the S-HAC switch.
Transmission & Drive Features
- The
five-speed transmission's second gear ratio and overall final ratio
matches the engine's stronger output for outstanding acceleration and
top speed.
- True to Suzuki
transmission standards, the gear shift operation is smooth and precise.
Carefully designed parts like the precisely machined shift cam and
corresponding gears create a transmission a racer can rely on.
- The
multi-plate, wet-clutch uses a rack-and-pinion clutch release mechanism
for precise feel of the engagement and disengagement points while
riding.
- The lightweight chain guide is shaped to accurately route the drive chain smoothly.
Chassis Features
- The
RM-Z250 features a frame and swingarm design that continues Suzuki's
reputation for creating the best-handling motocross motorcycles.
- The
aluminum alloy, twin-spar frame combines cast and extruded sections to
achieve superior front-and-rear weight distribution, while balancing
strength and weight.
- The
2021 RM-Z250 frame is 370 grams (0.8 pounds) lighter but has a 10
percent increase in torsional rigidity as compared to the prior
generation frame.
- The
engine's position in the frame is rotated up so the crankshaft sits
higher in the chassis to further the bike's nimble handling
characteristics.
- The rear,
upper engine mounts are outboard of the cylinder head to increase
rigidity and allow a direct intake path to the engine.
- The engine mount material is changed to aluminum, rather than steel, for reduced weight.
- The swingarm is shaped using an innovative hydroforming process that maintains strength but weighs 0.6 pounds (270 grams).
- The
hydroforming process enabled engineers to create tapered swingarm beams
that increased rigidity, while reducing heavier assembly welding.
- Hexagonal aluminum rails are used on the sub-frame for lighter weight, a slimmer appearance, and easier air filter access.
- The
sub-frame rails are moved inward to slim the bodywork but are also
raised to provide additional space for the larger air cleaner.
- Not
only is the new sub-frame narrow, but all of the body work is slim, so
the rider can move freely in the cockpit, especially during spirited
riding.
- The KYB-supplied
shock absorber has a thin-wire spring, spring guide, cushion rubber
guide, and lower link that are lightweight and have better movement
reaction. The spring and link weigh a pound (447.5 grams) less than the
prior generation's parts.
- This
KYB shock has specialized damping force circuits and a refined rear
lever ratio to help improve the suspension's traction characteristics.
- The damping force adjusters have a wide tuning range, so the settings can better match the conditions and the rider's style.
- The
high-performance KYB coil spring front fork has legs with the same
springs and damping force components, so front suspension tuning and
maintenance is balanced and easy: a great benefit during frequent
riding.
- This fork uses a
free-piston design that separates air and oil to optimize the damping
characteristics. The design also helps control the damping cartridge's
pressure and spring recoil, so the fork action remains supple and
precise.
- The Renthal
aluminum tapered handlebar has a flatter bend with less pull-back than
prior models to aid rider control during aggressive maneuvering.
- A rigid, but lightweight upper fork bracket complements the front suspension and handlebars.
- To
improve stopping performance and feel, a 270mm diameter, wave-style
front brake rotor and a Nissin two-piston brake caliper are used.
- The
brake pad material was developed for the RM-Z250 to improve
performance. The master cylinder is a push rod type that more
effectively transmits the squeezing force that the rider applies to the
lever.
- The rear brake
master cylinder hugs the frame beam to reduce dirt contamination and the
chance of the rider's boot touching it during riding.
- The
wheels feature black anodized D.I.D Dirt Star rims with a cross-section
design that maintains strength while reducing un-sprung weight.
- To
match the handling potential of the RM-Z250, the wheels are fitted with
racetrack-developed Dunlop Geomax MX33. Additionally, the rear tire is
nearly a half-pound (160 kg) lighter than the tire used on the prior
generation RM-Z250.
- Suzuki
beak-inspired styling has a sharp front fender and radiator shroud
shapes that blend into the frame's side covers and an upswept tail, to
promote the impression of speed while reducing weight and easing
service.
- The functional
styling and the motorcycle's trim chassis permits a variety of rider
positions that facilitate control and comfort.
- Compared
to the prior RM-Z250, the 2021 edition has ergonomic improvements from
the new bodywork, the rider's footpegs are moved 0.12 inches (3.3 mm)
forward and 0.2 inches (5.2 mm) upward, while the handlebar grip
position is moved 0.3 inches (7.4 mm) forward and 0.15 inches (3.8 mm)
downward, to create a high level of rider-control during competition.
- The plastic fuel tank weighs a half-pound less than the prior model's aluminum tank. Fuel capacity is 1.66 US gallons.
- The
seat base, inner fenders, and side covers were developed to reduce
moisture and dirt from reaching the air cleaner. This helps prevent
debris from contaminating the air filter.
- The
slimmer seat has a specialized foam density to aid the rider's control
of the motorcycle. The seat has a large gripper panel that runs
nose-to-tail on the cover.
- The Suzuki Champion Yellow bodywork is enhanced with distinctive striping and modern logo graphics that are updated for 2021.
Engine
- Engine: 249cc, 4-stroke, liquid-cooled, single cylinder, DOHC
- Bore x Stroke: 77.0 mm x 53.6 mm (3.0 in. x 2.1 in.)
- Compression Ratio: 13.75:1
- Fuel System: Fuel injection, dual-injector type
- Starter: Primary kickstarter with automatic decompressor
- Lubrication: Semi-dry sump
Drivetrain
- Clutch: Wet multi-plate
- Transmission: 5-speed constant mesh
- Final Drive: Chain, DID 520DMA4K, 114 links
Chassis
- Suspension Front: Inverted telescopic, coil spring, oil damped, adjustable damping force
- Suspension Rear: Single unit, link type, coil spring, oil damped, adjustable spring preload and damping force
- Brakes Front: Disc brake, single rotor
- Brakes Rear: Disc brake, single rotor
- Tires Front: 80/100-21 M/C (51M), tube type
- Tires Rear: 100/90-19 M/C (57M), tube type
- Fuel Tank Capacity: 6.3 L (1.66 US gal.)
- Color: Champion Yellow No. 2
Electrical
- Ignition: Electronic ignition (CDI)
- Ignition: NGK CR8EIB-10
Dimensions
- Overall Length: 2185 mm (86.02 in.)
- Overall Width: 835 mm (32.9 in.)
- Overall Height: 1255 mm (49.4 in.)
- Wheelbase: 1485 mm (58.46 in.)
- Ground Clearance: 330 mm (13.0 in.)
- Seat Height: 955 mm (37.5 in.)
- Curb Weight: 106 kg (233 lb.)
Warranty
