Browsing category

Engine Size

SEARCHING FOR THE ULTIMATE 2009 CRF450 CLUTCH SYSTEM:

Be careful what you wish for. There isn’t a motocross racer alive who doesn’t wish that he could have a works bike…preferably a works Honda CRF450. So, when Honda’s test department was prototyping the 2009 Honda CRF450, they decided to steal the works clutch from the race bikes of Millsaps, Short, Townley and Tedesco.

WE RIDE SERVICE HONDA’S KX500AF TWO-STROKE:

   Imagine, for a minute, the perfect motocross bike. Let your mind wander to unfathomable, unrealistic ideas. Draw up a sketch of the machine on paper, and don?t forget the vivid details. Odds are you would want to construct a motocross bike with a light, narrow, compact chassis. Cradled in the frame would be a potent engine with plentiful horsepower, yet one that was smooth and easy to ride. Now imagine that this dream can become a reality, because that’s what the MXA wrecking crew thought l…

2010 YZ450F: CLOSE-UP LOOK AT BIG BLUE:

Triple clamp offset has been changed from 25mm to 22mm, the bars are four-way adjustable, the airbox is just in front of the gas tank (and accessed by flipping the rear-hinged gas tank up), the rear shock is centered in the frame (and angled more towards the front) and the Kayaba SSS forks have a 10mm longer stroke. Not only is the cylinder tilted backwards, but the crank has been offset 12mm from the piston center line. By offsetting the crank, the force is transferred vertically down the connecting ro…

MXA RACE TEST: The New 2009 Husqvarna TC510; Suspension Settings, Jetting Specs, Likes & Dislikes, Plus Much More About The Big Husky 510 Engine

MXA RACE TEST: INSIDE THE 2009 HUSQVARNA TC510 There is a theory (that is more old wives? tale than fact) that the modern 450cc motocross bike makes more horsepower than anyone but AMA Pro-level racers can fully utilize. This isn?t true, for several very obvious reasons: (1) If you have ever turned the throttle wide open on your 450, then you know that you wanted more power. (2) No one says that you have to turn the throttle wide open; the power can be metered out. (3) When you ride a slow 450, you know…

FIRST LOOK AT THE TWENTY-TEN KTM 150SX, 250SX, 250SXF & 450SXF:

THE 450SXF GETS NEW FRAME GEOMETRY, LOWER SEAT HEIGHT, WORKS BRAKES AND FIVE SPEED TRANNY                     2010 KTM 50SX     (1) The 2010 KTM 50SX and 50SX Mini get new ignition covers with improved sealing for wet weather riding.     (2) The 2010 KTM 50SX and 50SX Mini benefit from the improved reliability of a new one-piece clutch hub and primary gear.     (3) The 2…

FIRST LOOK AT THE TWENTY-TEN YAMAHA YZ250F:

FIRST LOOK! TWENTY-TEN YAMAHA YZ250F: 26 THINGS YOU DON’T KNOW ABOUT THE 2010 YAMAHA YZ250F?     (1) All-new straight/smooth intake boot has been added to improved throttle response. The shock spring was moved to clear a path for the new air boot.     (2) The Keihin FCR carb has a built-in velocity stack in the carb venturi (replacing last year’s two-stage intake tract). Additionally, the accelerator pump cam shape has been changed for quicker fuel delivery. 2010 YAMAHA YZ2…

FIRST LOOK! TWENTY-TEN YAMAHA YZ250F:

FIRST LOOK! TWENTY-TEN YAMAHA YZ250F: 26 THINGS YOU DON’T KNOW ABOUT THE 2010 YAMAHA YZ250F?     (1) All-new straight/smooth intake boot has been added to improved throttle response. The shock spring was moved to clear a path for the new air boot.     (2) The Keihin FCR carb has a built-in velocity stack in the carb venturi (replacing last year’s two-stage intake tract). Additionally, the accelerator pump cam shape has been changed for quicker fuel delivery. 2010 YAMAHA YZ2…

ASK THE MXPERTS: Does The 2010 Honda CRF250 Use The Same Old Engine As The 2009 CRF250, Only With Fuel Injection Added?

ASK THE MXPERTS: IS THE 2010 HONDA CRF250 THE SAME OLD ENGINE AS 2009, ONLY WITH FUEL INJECTION ADDED?             Dear MXA,     Is the 2010 Honda CRF250 engine the same old engine that was in the 2009 model. Yes, I know that it has fuel injection, but that just replaces the carb. is it totally new?      The 2010 Honda CRF250 engine is new from the ground up. It shares nothing with the previous CRF250 design. Take a close look at the two photos…

FIRST LOOK AT THE TWENTY-TEN HONDA CRF250 & CRF450: Both Have EFI! They Share The Same Bodywork; Neither One Has Twin Pipes; Plus We List The Six Changes To The 2010 CRF450; See The List

FIRST LOOK AT THE TWENTY-TEN HONDA CRF250: Boasting an all-new, more powerful, more compact engine with Programmed Fuel Injection (PGM-FI) combined with an all-new Twin Spar Aluminum Frame featuring the Honda Progressive Steering Damper (HPSD), the 2010 CRF250 continues Honda’s long-standing position of class dominance. This latest CRF250 sets a higher benchmark for impressive power and class-leading handling all rolled into one competition-ready package. FEATURES/BENEFITS New for 2010 ? All-new, more c…

FIRST LOOK AT THE TWENTY-TEN HUSKY’S: Holy Cow! They Have Kayaba Forks, Lighter Hubs, Shorter Swingarms, New Plastic And The Lightest 250cc Four-Stroke Engine Ever Built

The all-new TC250 has the smallest and lightest four-stroke engine made. The same can be said for the side panels. FIRST LOOK! 2010 HUSQVARNA BIKES: Holy Cow! Kayaba Fork s Less weight, increased reliability, improved performance and handling. These have been the key elements behind the development work carried out by Husqvarna engineers on the new Enduro and Motocross models for 2010. Improvements to these factors have not been allowed to affect the Husqvarna off-road look that sets these machines apar…

FIRST LOOK AT THE TWENTY-TEN KWACKERS: The 2010 Kawasaki’s Are Here! The New Models: One EFI, Two Carbed; One Two-Stroke; It’s Deja Vu All Over Again

2010 KAWASAKI KX450F Fuel-injected perfection for demanding riders     The 2010 Kawasaki KX450F provides an ideal platform for riders looking to win races. Its precise aluminum frame, premium suspension components and expert-tuned settings are designed to deliver superb high-speed stability, enabling racers to capitalize on its amazing engine performance. Holeshot acceleration is delivered by a strong powerband and optimized chassis geometry specifically engineered to maximize rear wheel …

FIRST LOOK AT THE TWENTY-TEN SUZUKI RM-Z’S: Is The RM-Z250 Fuel Injected? What Has Changed On The RM-Z450? Find Out Here!

FIRST LOOK AT THE TWENTY-TEN SUZUKI RM-Z’S: 2010 SUZUKI RM-Z250 Suzuki races to win, period.  And, thanks to the hard work of Ryan Dungey in the U.S., the RM-Z250 is the AMA Supercross Lites West Coast Champion for 2009. But winning goes beyond the champagne. For the 2010 RM-Z250, Suzuki applied lessons learned on the track to turn up the speed, handling and confidence you?ll get racing every day, anywhere in the world.   Suzuki racing technology is everywhere you look: advanced Suzuki fuel in…

WE RIDE MDK MOTORSPORTS’ KAWASAKI KX450F:

To the majority of motocross racers worldwide, MDK is best known for its race team. In the past, MDK has sponsored a host of well-known racers (including Nick Wey and David Vuillemin on CRF450s three years ago) and, for the last two years, they have run Team KTM’s complete race effort. For 2009, they sponsor Travis Preston and Josh Summey in the 450 class, plus Wil Hahn, Justin Brayton, Ryan Sipes, Martin Davalos and Tommy Searle on KTM 250SXF’s. Also little known outside of NorCal is that MDK owns a st…

WE RIDE COLE SEELY’S FUN CENTER SUZUKI RM-Z250:

The MXA wrecking crew is a tight-knit group of riders. We ride every chance we get and race every weekend. Our crew is comprised of riders born in every decade (dating back to the 1940s), and while some are babes in the woods and others long in the tooth, we have a common love of motocross. Cole Seely, one of the newest additions to the MXA testing brigade, falls into the youngster category. Cole has been helping the MXA wrecking crew test bikes and do photo shoots. It was a selfless job for the 19-year…

FIRST LOOK AT THE TWENTY-TEN HONDA CRF450: Hondas Releases The Photo And the Specs, But No Major Details…Could It be BNG?

FIRST LOOK AT THE TWENTY-TEN HONDA CRF450   The perennial darling of the enthusiast press and racers alike, the CRF450R returns in 2010 to take its rightful place at the head of the class. With class-leading power and handling, the CRF450R features the perfect blend of power, suspension and handling for a genuine revolution in the premier motocross class. Available in Red. In dealerships TBD. MSRP: $TBD 2010 HONDA CRF450 SPECS

WE RIDE BEN EVANS’ TI LUBE HONDA CRF250;

   MXA’s goal is to ferret out the modifications, products and settings that work. In the dynamic world of motocross, where everything is constantly being updated, this isn?t as easy as it sounds. When the MXA wrecking crew has doubts, we fall back on our most important resource–AMA National riders. These are the men who demand the most from their machines and have the wherewithal to get the best modifications, products and settings to make their bikes work.    Over the past year, t…

MXA RACE TEST: The New 2009 Husaberg FE450; Suspension Settings, Jetting Specs, Likes & Dislikes, Plus Much More About The Unusual Upside-Down Engine

MXA RACE TEST INSIDE THE 2009 HUSABERG FE450    Of all the motorcycle manufacturers in 2009, perhaps the one with the least effective American marketing is the Husaberg FE450. There are two reasons for this:    1. Limited edition: Even in the best of times, Husaberg has never been a big player in the American market. And with a $9500 price tag, it never will be. Husaberg doesn’t run fancy color ads or spend millions on professional racers because they believe that if you want a…

THE BEST USED BIKES! WHICH 450’s TO KEEP FOR ANOTHER SEASON? Which Used Bikes To Save And Which Ones To Jettison; We Name Names

CAN MY OLD 450 MAKE IT ANOTHER SEASON OR TWO? THE MONEY YOU SAVE CAN FINANCE YOUR RACING CAREER    Let’s take it for granted that your trusty, but rusty, old bike isn’t leaking fluid out of the shock, making clunking noises at low rpm, suffering from terminal rust behind the ignition cover, cracking down the head tube like old concrete or oozing tranny oil that looks more like chocolate milk than 30 weight. If your bike is sound and air worthy, your next questions should be:  …

The Yamaha 2009 YZ450F; Suspension Settings, Jetting Specs, Likes & Dislikes, Plus Much More

INSIDE MXA’S 2009 YAMAHA YZ450F TEST    For 2009, Yamaha is playing it close to the vest. Given the fragility of the marketplace and the pressure on price, Yamaha took the safe-and-sane approach to 2009 model revisions.     Safe side: Yamaha didn?t jump feet first into the fuel-injection fire. Their engineers were happy with the balance achieved with the trusty Keihin FCR carb and decided to leave the experimenting to the other guys.     Sane side: Yamaha knew that it would…

MXA RACE TEST: The New 2009 Kawasaki KX250F; Suspension Settings, Jetting Specs, Likes & Dislikes, Plus Much More

MXA TEST OF THE 2009 KAWASAKI KX250F There are several key ingredients that are necessary for a competitive 250cc four-stroke motocross bike. Element number one is the engine-—the heart and soul of the machine. Without a powerful 250cc four-stroke engine, the overall package of the race bike would be severely compromised. Next is the suspension. The forks and shock must work in unison with the rider’s weight and skill level. The suspension is instrumental in helping the frame’s geometr…

MXA RACE TEST: The New 2009 Suzuki’s RM-Z250; Suspension Settings, Jetting Specs, Likes & Dislikes, Plus Much More

INSIDE TEST OF THE 2009 SUZUKI RM-Z250    For a bike that is celebrating its fifth birthday, it’s strange that the Suzuki RM-Z250 is only three years old. How can that be? It’s simple. The first real Suzuki RM-Z250 was the 2007 model. Well, technically Suzuki offered their first RM-Z250 in 2004, but, in truth, the 2004, 2005 and 2006 RM-Z’s were built by Kawasaki (as part of the short-lived Suzuki/Kawasaki alliance). In essence, Suzuki private-labeled a yellow version of the KX250F for three y…