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125-150

2004 YAMAHA YZ125

We normally ignore doomsday predictions. They never come true. Do you remember the Y2K hysteria, or the Nostradamus hype? There is, however, a new end-of-the-world scare! It is the much-hyped extinction of the two-stroke. Are we scared? No. Why not? Because no self-respecting motocross racer would move from a two-stroke to a four-stroke unless it was better. Two-strokes will thrive as long as they are competitive. And, when the day comes that they aren’t up to snuff, we won’t shed a tear if they join th…

WE TEST THE 2004 KTM 125SX

For the record, the KTM 125SX has the best two-stroke engine in the class. It puts most Japanese bikes to shame on the dyno, in first turn drag races, and up hills.

INTRODUCING THE 2004 HONDAS

2004 CR125R Changes for 2004 ú New electronic power valve for optimum valve timing and improved power throughout the range ú TMX-x carburetor gets new throttle position sensor (TPS) for improved linear throttle response ú New quick adjust clutch perch ú New clutch lever to improve feel and action ú New aluminum Renthal Bars (971 Bend) ú New “non-slip” seat cover for increased rider control ú New footpeg hinges prevent dirt accumulation for consistent footpeg angle ú New Dunlop 742 front and 756 rear tir…

YAMAHA 125 INTRO-AN ONLOOKERS PERSPECTIVE

By John Basher As Tim Olson and I were cruising down the highway towards Glen Helen raceway on a beautiful Tuesday morning, I slowly began to see the track in the distance creep up on the horizon. It wasn’t my first time visiting the huge hills of Glen Helen, but today was different. I immediately discounted that the weather was different, simply because the weather is ever sunny at San Bernardino (or seems like it). I glanced in the rear view mirror, and then I remembered. With Tim at the wheel and myse…

2004 YAMAHA PHOTOS AND SPECS-

2004 YAMAHA YZ125 What’s new on the 04 YZ125? 1. The shape of the scavenging port and exhaust port is changed (the timing is also revised) 2. The setting on the YPVS governor spring is changed for better acceleration in the low to mid. 3. The carb setting at the bypass port is changed. 4. The exhaust pipe is increased in overall length by 5mm, mostly at the head pipe (not on European models). 6. The diameter of the stinger is increased 1.6mm (in front of the silencer) 7. The shift pedal is downsized 9mm…

2004 KAWASAKI PHOTOS AND SPECS

2004 KAWASAKI KX125 Kawasaki engineers succeeded in boosting overall power of the 2004 KX125 and revised the chassis for even sharper handling characteristics. *The combustion chamber of the liquid-cooled, 124cc, two-stroke single-cylinder engine is reshaped and compression increased to give it more low and mid-range power and crisper throttle response. *Aiding the enhanced throttle response is a new piston and ring, which has the piston ring locating pin at the rear of the cylinder to evenly distribute…

2004 SUZUKI PHOTOS

2004 RM-Z250 The engine was designed by Suzuki, but the full package is being produced by Kawasaki. The compact 249cc, four-stroke, liquid cooled engine features a four-valve head (the valves are titanium). The cylinder is plated aluminum and houses a forged, two-ring piston. Carburetion is via a 37mm Keihin FCR (with hot start and throttle position sensor) The lubrication system is a semi-dry sump with separate oil chambers for the crank and transmission, but shared oil. Five-speed transmission. Titani…

HOW TO GET YAMAHA SECRET YZ125 NEEDLE

The MXA test crew has used a special needle in its 2002 YZ125. The original MXA needle was a works part that was hand made. During testing, the works needle performed better than the stock YZ125 needle. Unfortunately, the hand-made needle was not available through Yamaha dealers. Yamaha’s engineering department, urged on by their own in house test results, decided to work overtime to make the secret needle available to American racers. They ran a test program, verified the results and had Yamaha of Japa…

2002 HONDA CR125

Honda released pics and specs on their 2002 CRs. Here is all the info you need to know! (click on photo) CR125: The new list: 1. New third generation twin spar aluminum frame and swingarm. (1.1 lb lighter than last years frame) 2. Redesigned rear brake system with integrated reservoir and master cylinder. 3. New 36mm Mikuni TMX-X carburetor 4. Air intake boot reshaped and boot volume increased. 5. Exhaust port reshaped. 6. Redesigned 8mm longer exhaust header. 7. Taller first gear ratio and closer spacin…

2001 HONDA CR125 & CR250

Want to know what’s different on the 2001 CR125 compared to the CR250 other than a smaller motor? HERE’S WHAT’S NEW ON THE 2001 CR250 1. New cylinder port shapes and timing specs provide a smoother and stronger power delivery, and produce lightning-quick acceleration. 2. All-new lighter 38mm flat-slide Mikuni TMX carburetor adds both initial throttle crispness and improved throttle response to complement the new engine character. 3. New reed-petal stopper shape improves mid-range and high-rpm power deli…

2001 SUZUKI RM125!

Want to know what next year’s RM’s will look like (about six months before they release them)? Look no further. The 2001 RM’s will feature a totally new gas tank, new radiator wings, side panels, fender and front number plate. Insiders report that Kayaba will get the suspension contract for the 2001 RM250, but MXA’s spy photos reveal Showas on the 2001 RM125. Look for an external water pump, which will require new cases on both the 125 and 250. The 2001 engine is totally redesigned. The most noticeable …

MXA’S SECRET JETTING SPECS, 2003 And Back

We can’t tell you how to jet your bike. It’s a big world out there (and we don’t know you all that well). However, we can tell you what jetting we run in the MXA test fleet. Take into account that we race in a Mediterranean climate, near sea level, within sight of palm trees and never far from a Double Latte. We also run fresh 92-octane gas, work on our bikes every week, clean the filters, change pistons and rings regularly, are alert to pinging and haven’t changed oil brands in over a decade. This is t…

THE 20-INCH TIRE REVOLUTION

Why are so many of the factory riders testing 20-inch front tires? Are they guinea pigs? What are the advantages and disadvantages of the new tire size? Is the 20-inch actually smaller than a 21-inch tire? Are consumers going to have to dig into their pockets to pony up for a 20-incher next year? What’s all the hype about?