Online Reviews Of 2012, 2011 and 2010 Suzuki Dirt Bikes.

With the manufacturers focusing on the 94-decibel sound requirement, everyone expected to see the performance side take a bit of a backseat this year. I mean, after all, louder is faster, right? Well, the engineers responsible for Suzuki dirt bikes have spent some major time refining the 2011 Suzuki RMZ 450. Guess what? Louder doesn't always mean faster. The quieter, more ear-friendly 94 decibels not only sound much better for the moto racers and spectators but will also surprise you when it comes down to actual performance on the track.

Suzuki USA definitely did its homework. With a new exhaust system, revised intake and exhaust cam profiles, upped compression and updated ECU settings, the Suzuki dirt bikes offer an amazing noise level while keeping the power right where you want it. Motocross riders will notice that the Suzuki dirt bikes provide a more pleasing noise level, however the power feel is smoothed out compared to the hit from a year ago. However, that's mainly reflected in the power feel and not at all in the power delivery. For example, most people crack the throttle, feel the back tire break loose and their bike wants to rip from their hands-then instantly claim they have the fastest bike around. Maybe there is some truth to that, but nine times out of 10 it won't show an improvement in lap times. Some moto racers may want more hit down low for some of the tight tracks, but all that is required is simple extra tooth on the rear sprocket. Once that is achieved, there is a great feel for the torque and delivery of this motor combined with impressive traction and drivability.

The new 2011 Suzuki RMZ 450 has it all. The power delivery of this motor gives traction everywhere you want down low; with a seamless transition through mid to top and great overrev, this is not the kind of bike to slap you silly and call you stupid. It's not slow by any means, but it is easy to ride consistently...consistently fast. It will get you there just as quick, if not quicker, and with a lot less effort than the other 450s.

The strong, tractable power is a real benefit to the RM-Z 450 chassis. It helps with that "take whatever line you want and change direction whenever you feel like it" sensation. The 2011 Suzuki RMZ 450 can turn later and pivot off just about any rut or berm or, if those aren't available, any little dirt clod will suffice. Now you may think that by having such awesome cornering traits the Suzuki might be a little unstable at speed, but it's not. The RM-Z 450 Suzuki dirt bikes are very stable. That stability combined with the "go where you want" cornering really opens up your options on the track and changes the way you look at connecting turns. As for the suspension, it does what it's supposed to do. It may not be the best out of the box, but it is definitely not the worst. It is very balanced and doesn't do anything truly wrong. It uses the whole stroke and really plays well with the power and cornering traits of the RM-Z. By using the whole stroke, it soaks up the chop and keeps the power to the ground, and luckily still has great bottoming resistance. It is a well-rounded setting for a wide variety of riders.

But Suzuki dirt bike engineers didn't stop there with the development of its revised RM-Z 450 as they also looked toward some added durability. The 2011 RMZ 450 comes with stronger main bearings, a new cylinder design for better crankcase breathing, and a more durable injector in its 43mm Keihin throttle body. The front brake was updated with a new aluminum piston (replacing last year's resin piston) and a refined rotor. According to Suzuki USA these changes improve the performance (the front brake has excellent control and feel) and bumped up the durability (always a good thing). The new 2011 Suzuki RM-Z 450 also comes with a stronger seat cover to help reduce long-term wear.

2011 Suzuki RMZ 250:

For 2011 Suzuki has taken its potent RM-Z 250, and have fine-tuned it into an even more capable machine. The 2011 RM-Z 250 Suzuki dirt bikes have seen numerous updates: it now meets a stricter AMA noise limit (94db) while maintaining smooth engine output; the intake and exhaust timing has been changed for better engine feeling with lower noise output; the exhaust pipe length has been changed for better engine feeling with lower noise; ECU settings have been updated for more linear acceleration and improved over-rev; and the radiator hose routing has been changed for more efficient cooling.

In addition, Suzuki USA has focused on improving operation and overall feeling (primarily in shifting and starting). The 2011 RM-Z250 features improved lubrication on the center of the clutch and counter shaft for better durability and improved clutch feel; an updated transmission (focusing on 3rd and 4th gear) provides improved durability; and the kick starting arm has been redesigned for improved starting.

And to cap off an already impressive ride, engineers responsible for these Suzuki dirt bikes have focused on providing easier maintenance features on the 2011 RM-Z250 as well. Updated wiring harness routing and a convenient fuel line cap for regular maintenance are two new features.

Suzuki racing technology is everywhere you look on the 2011 RMZ250 : the 249cc engine utilizes advanced Suzuki fuel injection, and when combined with the twin-spar aluminum frame and class-leading Showa suspension components, you get the perfect weapon for motocross racers worldwide. And there’s also the eye-catching slim, aggressive styling that causes the 2011 Suzuki RM-Z250 to stand out at any track.





2010 Suzuki RMZ 450:

No one expected 2010 to be such a big year for Suzuki moto bikes.

Suzuki Dirt Bike engineers have been busy dialing in and improving on its big RMZ450 MX bike. Modifications to the 2010 RM-Z450 engine include revised cam profiles, cylinder-head porting, and an improved camchain tensioner. Suzuki also optimized the RM-Z450’s electronic fuel injection, reversing the throttle valve movement. Changes to the chassis include a two-piece head stock that’s 9mm-taller than last year. The Showa 47mm forks have new spring rates. The extruded and cast members on the rear section of the frame are now wider, and the motorcycle’s wheelbase is 0.6-inches longer. The Showa rear suspension features revised spring and damping rates.

Suzuki Dirt Bike 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, the 2010 RMZ 450 now has arm-stretching high-rpm power. A combination of revised cam profiles and reworked cylinder-head porting give the 2010 RM-Z450 amazing idle-to-redline thrust. An improved camchain tensioner provides more consistent performance. Also a modified throttle linkage makes the low-speed throttle response more progressive.

Improved Fuel Injection: 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 Dynamics: Everywhere you look, the RM-Z450’s twin-spar aluminum alloy frame has received detailed improvements to optimize rigidity & balance. It starts with the head stock, which is now a two-piece design that’s 9mm taller than before. 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 RMZ450 employs race-bred, state-of-the-art Showa suspension front and rear. For 2010, both ends of the moto bike are given suitably revised spring and damping rates. The new rates work together with the chassis’ optimized rigidity balance to improve handling. Showa 47mm inverted forks provide optimum wheel travel and can be adjusted for compression as well as rebound damping. A Showa rear shock offers both high- and low-speed compression damping adjustment along with rebound damping and spring preload adjustments. Working through Suzuki’s rising-rate linkage system (now with revised link-bearing tolerances for precise handling performance) the shock provides 310mm of wheel travel while delivering maximum traction.

These refinements will provide many benefits to the moto racers enjoyment on the track!


2010 Suzuki RMZ250:

The rumors are true. Suzuki Dirt Bikes engineers 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-Z 250 is now fuel-injected. Controlling the flow is a 43mm throttle body with progressive throttle linkage that is powered by a magneto-generator. It has been adapted from the system established two years ago in the RM-Z450. The radiator louvers have been redesigned to direct more air to the twin side-mounted aluminum alloy radiators and keep the new EFI engine running cool.

The implementation of fuel-injection, 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 intake ports. Suzuki Dirt Bike engineers 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-Z 250 moto machine more pull 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.

Suzuki Dirt Bike Racing Technology is everywhere you look: advanced Suzuki fuel injection is fitted for the first time on a four-stroke 250cm3 Suzuki moto 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 moto racers everywhere. Chassis updates improve handling with key suspension upgrades making the new 2010 RM-Z250 the perfect weapon for moto racers worldwide. And there’s the eye-catching slim, aggressive styling that causes the RMZ250 to stand out at any track.

Fuel Injection: Derived from the RM-Z450’s superlative system, the RM-Z250’s battery-less injection features a 43mm throttle body with progressive throttle linkage, a 16-bit on-board 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 now has thicker walls, 3.0mm versus 2.5mm, while the side rails are slightly shallower. Connecting the 19-inch rear wheel and chassis is a new swingarm design. The redesigned swingarm features improved center brace for increased rigidity/mass centralization for enhanced suspension action and greater traction. To prove that Suzuki Dirt Bike engineers understands the importance of even the smallest details, new footrest brackets are designed to prevent mud clogging.

Updated High-Performance Suspension: Thoroughly revised spring and internal damping rates inside the Showa 47mm Forks and Showa Rear Shock result in improved handling for a wider range of riders. These carefully chosen modifications improve traction and rider confidence at high speed without sacrificing the RMZ250’s legendary quick-turning ability. Modifications to the rear suspension linkage that reduce thrust backlash also improve traction and make for more consistent performance.

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