Despite having one of the strongest and most prominent off-road racing teams in the country for many years, Suzuki has been void of a serious full-bred off-road motorcycle in its lineup - until now. For 2010, Suzuki has introduced the all-new RMX450Z, which is closely based on the fuel-injected RM-Z450 motocrosser. And, yes, the RMX450Z is also fuel-injected and has an electric starter. It is also California "green-sticker" legal.

The big news from Suzuki's motocross side is that the RM-Z250 is now fuel-injected, just like the RM-Z450. So far, it's the only Japanese 250F that has been fitted with a fuel-injection system for 2010. But we have yet to hear from Yamaha or Honda.

Suzuki is again offering the RM125 and RM250 two-strokes but only in Europe.

Suzuki has not released any pricing information on the bikes, nor when the 2010 RMX or RM-Zs will be released to the stores.

The following is technical information on all three bikes straight from Suzuki:

2010 Suzuki RMX450Z

Fuel-injection
Suzuki pioneered fuel-injection for motocrossers, and the RMX450Z shares all key technologies with the stunning RM-Z450. Fuel-injection improves fuel efficiency, throttle response and reduces emissions, allowing the RMX450Z to be "green sticker" eligible in the state of California. On every trail in the world, the RMX450Z's fuel-injection provides unmatched smoothness of power delivery and trail-ready reliability thanks to a Keihin throttle body with progressive linkage. This advanced fuel-injection system also eliminates the need for re-jetting at higher elevations.

Air Box
To best suit the RMX450Z to life on the trail, the airbox features a hinged lid for quick air-filter maintenance and better protection from dust.

Electric Starting
The trail is no place to wear yourself out kick-starting a bike, so the RMX450Z comes with an electric starter, energized by a compact battery centrally located to reduce its influence on weight distribution and balance of the bike. To charge the battery and power the RMX450Z's lights, a larger magneto-generator is fitted. It's a win-win situation.

Engine & Transmission
Suzuki has made minimal modifications to the all-conquering RM-Z450's potent four-valve, DOHC engine for the RMX450Z. This lightweight engine now features a modified inlet tract along with revised cam profiles to increase low and mid-rpm power. Wider gear ratios in the 5-speed constant-mesh transmission that work with revised primary and final-drive ratios are ideally suited for a broad range of conditions, from scaling steep trails to high-speed open-terrain riding.

Reservoir Tank
The addition of a coolant reservoir tank increases on-trail reliability, while a relocated filler cap improves access.

Engine Guard
Because the trail can be a rocky place, a new engine protector plate is fitted. No stone was left unturned.

Chassis
Suzuki's light and effective aluminum alloy twin-spar frame construction is used in the RMX450Z, employing both cast and extruded sections for the utmost benefits of both: low weight, high rigidity, and high durability. The RMX450Z's aluminum alloy swingarm is derived from the RM-Z450's to maintain ideal balance, while the rear suspension linkage benefits from reduced free play. Its geometry combines the RM series' renowned turning-on-rails abilities with optimized handling performance that all serious trail riders want.

Suspension
Derived from the RM-Z450, the RMX450Z's trail ready suspension features the same phenomenal action as the race bike. The RMX450Z suspension utilizes high performance rebound and compression damping adjustable Showa forks combined with a Showa piggyback reservoir style rear shock featuring two-way adjustable compression damping with adjustable rebound damping and preload adjustments. Spring rates have been optimized for off-road riding. Every aspect of the RMX450Z's performance envelope has been carefully considered for serious off-road riding without compromising a millimeter of quality.

Ergonomics
Sit on an RM-Z450. Now go sit on the new RMX450Z. Feels just about the same, right? That's right. With an ideal riding position resulting from the motocross-developed seat, slim bodywork and low-profile aluminum alloy fuel tank, the RMX450Z allows the rider to concentrate on the terrain. A comfortable rider is a fast rider.

Instruments
A durable, ultra-compact enclosure houses a full-function instrument cluster on the RMX450Z-and can be configured for two modes, standard and sport. The sport mode simplifies the display so the rider can concentrate on terrain; it shows the timer, tripmeter, average speed and tire-diameter correction. In the standard mode, the display also shows speed, time, two trip lengths, and voltage. An integrated tire diameter calculator allows precise fine tuning for different tires to ensure accuracy of the speed and distance displays. The RMX450Z also features a low fuel level warning light for confident off-road riding anywhere you go.

2010 RMX450Z Technical Specifications

Overall Length: 2,185 mm (86.0 in.)
Overall Width: 830 mm (32.7 in.)
Overall Height: 1,260 mm (50.0 in.)
Wheelbase: 1,480 mm (58.3 in.)
Ground Clearance: 320 mm (12.6 in.)

Seat Height: 955 mm (37.6 in.)
Curb Weight: 123.5 kg (272.3 lbs.)
Engine Type: 4-stroke, liquid cooled, DOHC
Bore: 96.0 mm
Stroke: 62.1 mm
Displacement: 449 cm³
Compression Ratio: 11.6:1
Fuel System: Fuel-injection
Lubrication: System Suzuki Advanced Sump System
Clutch: Wet multi-plate type
Starter: Electric and Manual
Transmission: 5-speed constant mesh 

Primary Reduction Ratio: 2.708 (65/24)
Gear Ratios:
1st: 2.153 (28/13)
2nd: 1.611 (29/18)
3rd: 1.250 (25/20)
4th: 1.000 (19/19)
5th: 0.826 (19/23)
Final Reduction Ratio: 3.923 (51/13)
Front Suspension: SHOWA 47mm telescopic forks, pneumatic/coil spring, oil
damped
Rear Suspension: Swingarm, link type, SHOWA piggyback-reservoir shock
Caster: 29°18'
Trail: 130mm (5.1 in.)
Front Brake: Disc
Rear Brake: Disc
Front Tire Size: 80/100-21
Rear Tire Size: 110/100-18
Fuel Tank Capacity: 6.2 L (1.6 US gal.)
Body Color: Sold Black/Champion Yellow No. 2 (GY8)
*Product Specifications Subject to Change

2010 Suzuki RM-Z250

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. 

Engine
Engine modifications for the RM-Z250 maintain its impressive low-to-midrange power but add a thrilling high-rpm rush to the mix - precisely what expert-level riders want in a potent four-stroke racing engine. Revised cam timing works in conjunction with updated intake ports to boost power and torque at the top of the power band. A new, stronger connecting rod and mirror finishing permits maximum engine speed increased to a stunning 13,500 rpm. Crankshaft modifications similar in spec to the championship-winning RM-Z450 increase rigidity and strength. The 249cm3 engine continues to use a DOHC, 4-valve head design with lightweight titanium valves riding in an advanced pent-roof cylinder head and semi-dry-sump lubrication system reduces internal friction. With a top-end rush like no other, the RM-Z250's engine has to be experienced to be believed.

Chassis
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.

Suspension
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.

Radiator Louvers
Improved radiator louvers direct more cooling air to the twin side-mounted aluminum alloy radiators for lower engine temperatures. They are joined to the outer bodywork for increased strength without adding weight.

Color
For 2010, the RM-Z250's number plates have a black background to conform to rules for competition numbers. It's one less thing to worry about so racers can concentrate on winning.

2010 RM-Z250 Technical Specifications

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 Type: 4-stroke, liquid cooled, DOHC
Bore: 77.0 mm
Stroke: 53.6 mm
Displacement: 249 cm³
Compression Ratio: 13.4:1
Fuel System: Fuel-injection
Lubrication System: Suzuki Advanced Sump System
Clutch: Wet multi-plate type

Transmission: 5-speed constant mesh
Primary Reduction Ratio: 3.210 (61/19)
Gear Ratios:
1st: 2.153 (28/13)
2nd: 1.764 (30/17)
3rd: 1.470 (25/17)
4th: 1.238 (26/21)
5th: 1.090 (24/22)
Final Reduction Ratio: 4.000 (48/12)
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 Size: 80/100-21
Rear Tire Size: 100/90-19
Fuel Tank Capacity: 6.5 L (1.7 US gal.)
Body Color: Sold Black/Champion Yellow No. 2 (GY8)
*Product Specifications Subject to Change

2010 Suzuki RM-Z450

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
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.

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.

2010 RM-Z450 Technical Specifications

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 Type: 4-stroke, liquid cooled, DOHC
Bore: 96.0 mm
Stroke: 62.1 mm
Displacement: 449 cm³
Compression Ratio: 12.2:1
Fuel System: Fuel-injection
Lubrication System: Suzuki Advanced Sump System
Clutch: Wet multi-plate type
Transmission: 5-speed constant mesh
Primary Reduction Ratio: 2.625 (63/24)
Gear Ratios:
1st: 1.800 (27/15)
2nd: 1.471 (25/17)
3rd: 1.235 (21/17)
4th: 1.050 (21/20)
5th: 0.909 (20/22)
Final Reduction Ratio: 3.846 (50/13)
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 Size: 80/100-21
Rear Tire Size: 110/90-19
Fuel Tank Capacity: 6.2 L (1.6 US gal.)
Body Color: Sold Black/Champion Yellow No. 2 (GY8)
*Product Specifications Subject to Change