Big Bore

This story is much more about an engine than about the bike itself. More specifically, it is about the trend that this engine represents. KTM's 2012 250SXF engine is an advanced, 248.6cc, water-cooled and fuel-injected mechanical marvel. It…
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Q: ARE THE 2012 HUSQVARNA CR125 AND CR144 THE SAME BIKE? A: They are the same bike, but both start life as a CR125! When you buy a CR125 in the USA, Husqvarna automatically includes the 144cc kit with the necessary cylinder, head, piston…
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The plight of the Yamaha YZ125 brings a tear to the eye of every MXA test rider. For 14 out of the last 17 years, the YZ125 has been the best 125cc motocross bike made. Unfortunately, with the advent of the 250cc four-stroke, the YZ125 has…
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As the niche marketing specialist of dirt bike manufacturers, KTM has a wider variety of models than Baskin-Robbins has flavors. However, the model you won?t see at your KTM dealership is a motocross-specific Open class two-stroke. The KTM…
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What's unique about this MXA project bike is that it wasn?t possible a few months ago. In the past, the MXA wrecking crew has had phenomenal success with big-bore engines?with the sole exception of the Honda CRF250. From its…
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The YZ310F wasn?t built for a chassis test. MXA left the suspension stock. The motor, on the other hand, was a three-grand endeavor, not including the Hinson clutch and titanium FMF exhaust. A quick look at the specifications of Thumper…
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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…
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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…
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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…
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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…
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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?…
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