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Big Bore

WE RIDE MILLENNIUM TECHNOLOGIES’ HONDA CRF264 BIG BORE

If you have a carbureted CRF250 you are out of luck for an effective big-bore. The 2010 and 2011 CRF250s have thicker cylinder liners that offer more than enough room to go bigger. As a rule, the MXA wrecking crew keeps our test bikes in stock trim. Even though we have access to every hop-up part in the world, we need to keep our bikes as stock as possible to ensure a fair platform for testing individual aftermarket products and different settings throughout the year. When we test major modifications, w…

WE BUILD AN L.A. SLEEVE YAMAHA YZ270:

If you own a 2006 to 2010 Yamaha YZ250, consider yourself lucky. You have one of the best motocross bikes ever made. It weighs less than a comparable four-stroke, costs less to repair and produces more horsepower per cc. And most importantly, it comes stock with Kayaba SSS suspension. It is a sweet motocross machine. However, there is a but. If you are racing your YZ250 against 250cc four-strokes, you have a superior motocross machine; but if you race the 450 class on your YZ250, you are giving up a bun…

MXA PRODUCT SPOTLIGHT! MILLENNIUM TECHNOLOGIES/CP PISTON HONDA CRF264 BIG-BORE KIT: How To Get More Juice From Your 2010 Honda CRF250 At A Price That Is Very Attractive

  MXA NEW PRODUCT: MILLENNIUM TECHNOLOGIES/CP PISTON HONDA CRF264 BIG BORE KIT: HOW TO GET MORE JUICE FROM YOUR 2010 HONDA CRF250 With earlier model Honda CRF250’s (2004-2009), it was difficult to big-bore the engine much past 256cc without endangering the cylinder liner’s structural integrity (or resorting stroking the crank). No more! Thanks to a cooperative effort between Millennium Technologies ( www.mt-llc.com ) and CP Piston ( www.cppistons.com ) it is now possible to build (at a reasonable p…

WE RIDE A BIG-BORE HONDA CRF469 PROJECT BIKE:

You?re gonna want to read this bike test. This is a story of a project bike that got out of hand. A bike that should have been awesome, and, in fact, had lots of awesome attributes, but turned out to be just average. If only we?d been smart enough to unload the gun before shooting ourselves in the foot. Read it and weep, because the MXA wrecking crew can promise you that we are?weeping, that is. SHOP TALK: DISCUSSING THE COMPONENTS The cylinder on our Honda CRF450 was bored and re-plated to 98mm to incr…

WE RIDE MAXPOWER/RPM’S BIG-BORE KX315

    WITH TODAY’S METALLURGICAL CONFIGURATIONS, IT IS POSSIBLE TO MAKE AN ENGINE PRODUCE MORE POWER, ACCELERATION, SPEED AND SENSATIONS THAN THE HUMAN MIND CAN PROCESS OR HUMAN BODY MANAGE.             Formula 1 race car designers, from as far back as Colin Chapman, have understood that there is a delicate balance between weight and power. In truth, the never-ending pursuit of power has pretty much ended, and if it weren’t for computer mana…

WE RIDE PIONEER’S BIG-BORE SUZUKI RM-Z475

  NAMED AFTER THE EMBARRASSINGLY SHALLOW MTV SHOW, WHERE CELEBRITIES SHOW OFF THEIR  HOMES, SHOES, CARS AND SPAS, THE “CRIBS EFFECT” HAS SPREAD THROUGHOUT EVERY SOCIAL STRATA OF AMERICAN SOCIETY. Pssst! Wanna know a secret? Four-stroke buyers are bucks-up. They are better off financially than any group of motocross racers in the 35-year history of the sport. Suddenly, it appears as though everybody in America is rich?ostentatiously so. Modern racers are more than willing to spend beaucoup mone…

MXA PRODUCT TEST: L.A . SLEEVE YAMAHA YZ272F KIT

      WHAT IS IT? Memorize this phrase: “There’s no substitute for cubic centimeters.”   WHAT’S IT COST? $1398.95 (pipe, cam, cylinder and piston kit)(562) 945-7578. www.lasleeve.com     WHAT’S IT DO? The 250F four-stroke craze has created a unique problem for your typical Vet racer. It’s a choice problem. They love that they don’t get as tired on a 250F as on a 450, but hate how they get beat on the track by their buddies on 450s. It becomes almost cyclical, as a guy will …