Drag site icon to your taskbar to pin site. Learn More

2010 Suzuki RM-Z250/RM-Z450 First Look

Thursday, June 25, 2009
2010 Suzuki RM-Z250
The 2010 RM-Z250 is the first in its class to make the switch from a carb-fed engine to electronic fuel injection.
The rumors are true. Suzuki beat everyone to the punch, being the first of the Big Four to fuel-inject its four-stroke 250cc motocross motorcycle. You heard right. The 2010 RM-Z250 is fuel-injected. Controlling the flow is a 43mm throttle body with progressive throttle linkage that is powered by a magneto-generator after starting. It has been adapted from the system established two years ago in the RM-Z450. The radiator louvers also got a makeover in an effort to direct more air to the twin side-mounted aluminum alloy radiators and keep the new EFI engine running cool.

This, of course, brought about a few modifications to the engine. The core of the DOHC 249cc four-stroke remains the same, but it has undergone revised cam timing and updated its intake ports. Suzuki also went with a stronger connecting rod with mirror finishing and modified the crankshaft. The desired result of the changes is to give the 2010 RM-Z250 more oomph up top, which will be helpful since the switch to EFI has also added five pounds to its curb weight, up from 225 to 230.4 lbs.

Chassis updates, suspension mods, a new muffler, the Suzuki R&D crew has been busy with its 250. The motorcycle that brought home the 2009 AMA Supercross Lites West Coast title should be a serious contender come shootout time. Until then, here’s a little of the Suzuki PR about the 2010 RM-Z250.

The RM-Z250 has new radiator louvers that direct more cooling air at the twin side-mounted radiators.
The RM-Z250 has new radiator louvers that direct more cooling air at the twin side-mounted radiators.
Courtesy of Suzuki

Suzuki racing technology is everywhere you look: advanced Suzuki fuel injection is fitted for the first time on a four-stroke 250cm3 Suzuki motocross machine. Further engine modifications boost peak power without giving up any of the low-end or midrange that has made the RM-Z250 the choice of top riders everywhere. Chassis updates improve handling with key suspension upgrades making the new RM-Z250 the perfect weapon for motocross racers worldwide. And there’s the eye-catching slim, aggressive styling that causes the RM-Z250 to stand out at any track.

Fuel Injection
Derived from the pacesetting RM-Z450’s superlative system, the RM-Z250’s battery-less injection features a 43mm throttle body with progressive throttle linkage, a 16-bit computer and unique capacitor-assisted starting system. A durable, lightweight magneto-generator powers the fuel injection after starting. Because all engine systems are related in performance, a new muffler is fitted to optimize the benefits of fuel injection.

Chassis Updates
In the search for handling perfection, the RM-Z250’s twin-spar aluminum alloy frame has been redesigned with several key components to optimize rigidity balance and improve traction at high speed. The lower frame tube has thicker walls, 3.0mm versus 2.5mm, while the side rails are slightly shallower. Connecting the 19-inch rear wheel and the lightweight chassis is a new swingarm with an improved center brace for increased rigidity that also more concentrates its mass for enhanced suspension action and greater traction. To prove that Suzuki understands the importance of details, new footrest brackets are designed to prevent mud clogging.

High-Performance Suspension, Updated
A 12-hole fuel injector with a reversed throttle valve movement is at the heart of the RM-Z450s electronic fuel injection.
A 12-hole fuel injector with a reversed throttle valve movement is at the heart of the RM-Z450's electronic fuel injection. Suzuki's 250cc motocrosser now comes with EFI technology inherited from the RM-Z450.
Thoroughly revised spring and damping rates inside the inverted Showa 47mm fork and piggyback single shock result in improved handling for a wide range of riders. Carefully chosen modifications improve traction and rider confidence at high speed without sacrificing the RM-Z’s legendary quick-turning ability. Modifications to the rear suspension linkage that reduce thrust backlash also improve traction and make for more consistent performance.

2010 Suzuki RM-Z450

No big news like the 250’s switch to EFI in the RM-Z450’s camp, but it doesn’t mean that Suzuki hasn’t been busy dialing in and improving on its big MX bike. Modifications to the 2010 RM-Z450 engine include revised cam profiles, cylinder-head porting, and an improved camchain tensioner. Suzuki has also tinkered with the RM-Z450’s electronic fuel injection, reversing the throttle valve movement. Changes to the chassis starts with a two-piece head stock that’s 9mm-taller than last year and the Showa 47mm fork has new spring rates. On the tail end, the extruded and cast members on the rear section of the frame are wider, and the motorcycle’s wheelbase is 0.6-inches longer. The Showa suspension on the rear also features revised spring and damping rates.

Here’s a little more about the 2010 RM-Z450. Courtesy of the Suzuki PR peeps:

Powered Up!
2010 Suzuki RM-Z450
The 2010 Suzuki RM-Z450 received a few engine mods, chassis upgrades, and suspension tweaks this year.
Suzuki’s engineers have carefully developed the RM-Z450’s powerful 449cm3, DOHC, 4-valve engine to increase power throughout the rev range. Always known for its incredible midrange grunt, the 2010 RM-Z450 also has arm- stretching high-rpm power. A combination of revised cam profiles and reworked cylinder-head porting give the RM-Z450 amazing idle-to-redline thrust. An improved camchain tensioner provides more consistent performance. Also a modified throttle linkage makes the low-speed response more progressive. How’s that? More power and better manners.

Fuel Injection, Pioneered and Improved
For 2010, the RM-Z450’s electronic fuel injection is improved with a reversed throttle valve movement. Such a simple alteration pays handsomely: The fine fuel-air mist from the 12-hole fuel injector is directed away from the throttle valve for a more uniform mixture producing increased power and enhanced throttle response.

Chassis Dynamic
Everywhere you look, the RM-Z450’s twin-spar aluminum alloy frame has received detail improvements to optimize rigidity balance. It starts with the head stock, which is now a two-piece design that’s 9mm taller than before. Further back, the sections at the rear of the frame, which are made up of extruded and cast members, are now wider for increased rigidity. More strength comes from a wider upper frame bridge beneath the saddle, while material wall thickness was strategically designed to save weight.

High-Quality Showa Suspension
The RM-Z450 employs race-bred, state-of-the-art Showa suspension front and rear. For 2010, both ends of the bike are given suitably revised spring and damping rates—the new rates work together with the chassis’ optimized rigidity balance to improve handling. 47mm inverted forks provide optimum wheel travel and can be adjusted for compression as well as rebound damping for maximum rider adjustability. A Showa piggyback reservoir rear shock offers both high- and low-speed compression damping adjustment along with rebound damping and spring preload adjustments. Working through Suzuki’s superlative rising-rate linkage system—now with revised link-bearing tolerances for precise handling performance—the shock provides 310mm of wheel travel delivering maximum traction.

Suzuki continues to offer its two-strokes, the RM125 and RM250, but only in the European market. Suzuki has not yet revealed the 2010 MSRPs.
2010 Suzuki Motocross Motorcycles
View Gallery
View Gallery
View Gallery
View Gallery
View Slideshow
Suzuki Dirt Bike Dealer Locator
2010 Suzuki RM-Z250 Specs
The slender silhouette of the 2010 RM-Z250.
Overall Length: 2,170 mm (85.4 in.)
Overall Width: 830 mm (32.7 in.)
Overall Height: 1,270 mm (50.0 in.)
Wheelbase: 1,475 mm (58.1 in.)
Ground Clearance: 345 mm (13.6 in.)
Seat Height: 955 mm (37.6 in.)
Curb Weight: 104.5 kg (230.4 lbs.)
Engine: 4-stroke, liquid cooled, DOHC
Bore: 77.0 mm
Stroke: 53.6 mm
Displacement: 249 cc
Compression Ratio: 13.4:1
Fuel System: Fuel Injection
Lubrication: Suzuki Advanced Sump System
Clutch: Wet multi-plate type
Transmission: 5-speed constant mesh
Front Suspension: SHOWA 47mm telescopic forks, pneumatic/coil spring, oil damped
Rear Suspension: Swingarm, link type, SHOWA piggyback-reservoir shock
Caster: 30°20’
Trail: 140mm (5.5 in.)
Front Brake: Disc
Rear Brake: Disc
Front Tire: 80/100-21
Rear Tire: 100/90-19
Fuel Tank Capacity: 6.5 L (1.7 US gal.) 
Color: Sold Black/Champion Yellow No. 2
2010 Suzuki RM-Z450 Specs
Suzuki Motorcycles has released its 2010 line of off-road and motocross motorcycles.
Overall Length: 2,190 mm (86.2 in.)
Overall Width: 830 mm (32.7 in.)
Overall Height: 1,270 mm (50.0 in.)
Wheelbase: 1,495 mm (58.9 in.)
Ground Clearance: 325 mm (12.8 in.)
Seat Height: 955 mm (37.6 in.)
Curb Weight: 112.5 kg (248.0 lbs.)
Engine: 4-stroke, liquid cooled, DOHC
Bore: 96.0 mm
Stroke: 62.1 mm
Displacement: 449 cc
Compression Ratio: 12.2:1
Fuel System: Fuel Injection
Lubrication: Suzuki Advanced Sump System
Clutch: Wet multi-plate type
Transmission: 5-speed constant mesh
Primary: Reduction Ratio 2.625 (63/24)
Front Suspension: SHOWA 47mm telescopic forks, pneumatic/coil spring, oil damped
Rear Suspension: Swingarm, link type, SHOWA piggyback-reservoir shock
Caster: 29°40’
Trail: 130mm (5.1 in.)
Front Brake: Disc
Rear Brake: Disc
Front Tire: 80/100-21
Rear Tire: 110/90-19
Fuel Tank Capacity: 6.2 L (1.6 US gal.)
Body Color: Sold Black/Champion Yellow No. 2

Login or sign up to comment.

Comments
charlie -it sucks  January 24, 2011 11:16 AM
this bike is the most pice of shit i have ride in a while it slow as fuck so go with handa 250 an let the suzki go to shit
Sam -Yellow team Begium  December 30, 2010 07:30 AM
I have an 450/09.Its realy fun riding.My other bike was an RM250.I do not want to change agian never ever!!!!!!
colton wolsey -awsome c  December 21, 2010 10:53 PM
wish i can get one so i can race in the 250f class
ETHEN B -awesome  November 23, 2010 09:21 PM
i got an 08 rmz 250 its awesome . but cant wait for the 2011 model
nolito cabinbin -bahaw team  November 13, 2010 12:30 AM
ang ganda nang RMZ...idol talaga,,,,
edgar diaz amezcua -suzuki forever  July 23, 2010 03:57 PM
digan lo que digan suzuki es una gran motocicleta sienpre a la punta sin los millones de honda
mr. kool -honda suzuki  May 13, 2010 09:55 AM
i like honda alot but when it comes to speed id rather have suzuki
cortsy -Sweet!!  May 13, 2010 05:45 AM
I SOOOOOOOOOO WANT 1!!!!
cody r -awsome bike  April 19, 2010 08:57 AM
these bikes ar the coolest
Paul R -2010 Suzuki RMZ 450  March 21, 2010 11:24 AM
Just picked mine up yesterday! This bike is so nice. Have not had a chance to ride it yet but will soon. I beleave i'm the first one in Oregon to have one.
Rm kidd -GO THE RM'S  March 1, 2010 11:38 PM
Suzuki FTW!!
jak123 -gahe  February 17, 2010 07:20 AM
these are a pretteie cool bike
nick youtsey -rm rules  February 16, 2010 08:06 AM
suzuki is the best ever
kayla -i just can't wait!!!  February 4, 2010 01:50 PM
all i wanna know is when the bikes are gonna be released for 2010? i had an 07 rmz 250 but sold ti so i can have the new one. so basically i'm dying waiting!
ralph -go suzuki  January 31, 2010 01:36 PM
cant wait to try out the new RM-Z250
jake -underrated  January 26, 2010 06:32 PM
everybody talks s@@t about suzuki but there just as good as everybody else
REY TUMBAGA -HI RMZ 450 CC  December 30, 2009 04:03 AM
GOOD BIKE POWERFUL GOOD DESIGN
Jason 916 -yup  December 28, 2009 08:39 AM
I own the 09 450 and its a great bike...can not wait to get the 250
ed -RM-Z250  December 7, 2009 07:04 PM
Have ridden previous models and have all been very good....Hoping for something even better from the 2010 model. looks good and specs speak for themselves but performance on the ground will be the real test....based on the past.....it should be a bloody good ride
christian -ehh ive seen better  December 4, 2009 05:12 AM
ive raced both yzf250 & rmz 250. yamaha is a much better choice. im 15 and race 250 b class. i like the suzuki its very nimble and i am happy with it but it doesnt have a thing on a yzf250
Pommy -RMZ250  November 10, 2009 01:51 AM
I got mine today lol It's brilliant!!!!
tyler -fi  November 3, 2009 05:55 AM
is the FI even worth it hear it adds like 7 pounds to bike
Master mind -Aspect  October 20, 2009 09:43 AM
I don't like the look of 2010 model. 2008 year was prettier....in my humble opinion
Jesse James -2010 suzuki rmz250  October 16, 2009 05:21 AM
This bike should be #1.
blane -nice  September 25, 2009 12:15 PM
bad ass bike
Jake -Gotta love RMs  September 9, 2009 03:44 PM
Once again Suzuki leads the way with fuel injection. For all those haters that said FI would never work on bikes and that it would never be the standard...finish eating those words. I welcome FI! <<<<<< All the way MAN !!!!!

Dudee -rmz250  August 30, 2009 05:36 AM
I have an 09 rmz 250, its an awsome bike to ride handles really well and has plenty of power through out, the only thing it really lacks is top end it could do with abit more, but is an all round excellent bike to have.
nick stewart -the new bike  August 19, 2009 07:28 PM
i love the changes that have been made, the 2010 bike's look better than ever, im an A grade junior rider and i ride an rmz 250. well i did and then i broke my leg and have a rod in it so ill be out of action till late next year. by the time a start riding again the 2011 models will probly be out. can't waite to see them
elt -rmz  August 14, 2009 04:41 AM
sik!
chaz -250  August 13, 2009 06:39 PM
whens the release date

jon.. -how much?  August 8, 2009 07:15 AM
how much for a 250?
YorkshireWhipper -Minstrels  July 31, 2009 02:56 PM
Its EFI for god sake not FI!
Quik Chanj -BIKES  July 29, 2009 09:52 AM
Get rid of the plastic and you have it all. No steel not real. I love my stripped down Suzuki M109R you can no longer recognize it as a plastic metric.
Tony -Honda CRF250R  July 14, 2009 02:45 PM
Honda beat suzuki for first 250cc with FI, go to motocrossaction magazine, they put a new FI 250 engine in the 450 chassis
mat shinn -swine flu kinda sick!!!  July 13, 2009 10:06 PM
ill take one !! this is great im sure dungey thinks it great too..
Wyatt Bailey -comment on 2010 rmz 250  July 13, 2009 05:00 PM
Love the new 2010 model i think the designers did a great job on the bike, inside and out.
Splint -RMZ 150  July 7, 2009 01:53 AM
The 450's are already here in my home town; just wondering if anyone has heard about an rmz150???
bob -2010 suzuki rmz 250  June 28, 2009 07:55 PM
when are they coming out
Tim B -Gotta Love the Yellow Team!  June 26, 2009 06:48 AM
Once again Suzuki leads the way with fuel injection. For all those haters that said FI would never work on bikes and that it would never be the standard...finish eating those words. I welcome FI!