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250sx

INSIDE SECRETS OF BUILDING A MOTO-READY KTM 300XC TWO-STROKE RACER

You live and learn, one dollar at a time. By Jody Weisel The vast majority of my racing life has been spent on two-strokes, but I?m a realist. When the four-stroke revolution came along, I didn?t feel a need to fight it. I have said many times that, if I weren?t a motorcycle test rider, I would be racing a Yamaha YZ250 two-stroke. However, my lot in life is to race and test what’s put before me, and, increasingly, since the four-stroke revolution began in 1998 and went full complement in 2006, the bikes…

MXA’S 2014 KTM 250SX MOTOCROSS TEST: THE KING OF TWO-STROKES HAS NO RIVALS FOR THE THRONE

FIRST AND FOREMOST, IS THE 2014 KTM 250SX BETTER THAN THE 2013 KTM 250SX? A: Yes. Unlike the Japanese manufacturers, the Austrians haven?t sat on their two-stroke designs. The KTM 250SX two-stroke has benefitted from every major chassis, brake, frame and cosmetic mod that the KTM 250SXF, 350SXF and 450SXF four-strokes have gotten. And, the changes they made for 2014 are all subject to interpretation. Q: WHAT CHANGES DID KTM MAKE TO THE 2014 ENGINE? A: The biggest news is that KTM switched from Moto Tass…

TWO-STROKE VERSUS FOUR-STROKE: 2012 KTM 250SXF VS 2012 KTM 250SX

And in this corner…the 2012 KTM 250SX two-stroke. The MXA wrecking crew can make one promise with this shootout: a KTM is going to win. In truth, this is the best two-stroke versus four-stroke comparison possible. Why? Both the KTM 250SX two-stroke and KTM 250SXF are brand-new models. They have been updated every year for the past five years?and they aren?t apples and oranges. This is as clear-cut and as accurate a head-to-head comparison can get. These are both brand-new, modern, up-to-date machines….

MXA TEAM TESTED: KREFT KTM 250/300 POWERDIAL POWER-VALVE ADJUSTER

WHAT IS IT? The Kreft PowerDial is an easy-to-install KTM 250/300 power-valve adjuster. It replaces the stock KTM system so that adjustments can be made in seconds. WHAT’S IT COST? $89.95 (black), $98.95 (Gold). CONTACT? www.kreftmoto.com or (970) 403-2715. WHAT STANDS OUT? Here’s a list of things that stand out with the Kreft PowerDial. (1) Function. The Kreft PowerDial makes it possible to adjust the spring preload on the KTM 250/300 power valve without tools. In fact, we could pull over to the side o…

MXA TEAM TESTED: STEAHLY BOLT-ON KTM 250SX FLYWHEEL WEIGHT

WHAT IS IT? Bolt-on traction control for 2007?2014 KTM 250SX two-strokes. WHAT’S IT COST? $119.95 (9 ounce and 11 ounce). CONTACT? (800) 800-2363 or www.steahlyoffroad.com . WHAT STANDS OUT?  Here’s a list of things that stand out with Steahly’s KTM 250SX 9-ounce flywheel weight. (1) Weight benefits. Adding a flywheel weight increases the rotating mass, or inertia, of the engine. The most noticeable results are that the engine revs a little slower, stays in the powerband longer, is less likely…

KTM 125, 250 AND 300 TWO-STROKES TO COME STOCK WITH BOYESEN REEDS

New for 2014, the KTM  125SX, 150SX, 250SX, 150XC, 250XC and 300X (plus two-stroke XC-W models) will be equipped with Boyesen RC2 Ultra-Flow reeds. Dag Boyesen said, ?We feel privileged to help advance the winning potential of KTM’s exciting new two-stroke models. The racing heritage and high-end intake performance experience of Boyesen, coupled with the impressive technological superiority of KTM’s current two-stroke products will surely have the industry taking notice, and as a result will contin…

MXA MID-SIZED SHOOTOUT: WHICH IS BEST? A 125 TWO-STROKE, 250 FOUR-STROKE OR 250 TWO-STROKE

  Not every rider is alike. There are riders who like the snap of a 250cc two-stroke, those who prefer to wring the guts out of a wide-open 125cc tiddler, and a third group that craves the abundant vibes of a 250cc four-stroke. The MXA wrecking crew decided to round up all three of these bikes and compare them head to head. Now, you might be wondering why we didn?t include a 450cc four-stroke in the comparison. The answer is simple: very few riders are trying to decided between a 450cc bike and a s…

HAVE YOU SEEN THE NEW MXA? BIG BUCKS BBR CRF190, WE RIDE PHIL NICOLETTI’S YZ450F, MAKE YOUR KTM 250SX TWO-STROKE BETTER, TROY LEE GEMS & MUCH MORE

On the showr o om floors now, the 2014 Yamaha YZ450F graces the August 2013 cover of MXA. If you designed and built your own frame, spec’ed the best suspension you could imagine and had a special 190cc engine built ? you could be a Brown Brother. The 1975 CR125 red striper and t he men who live your dream. A close-up look at the 2014 CRF250 and CRF450. What’s new, what’s not, what’s hot and what’s coming in 2014. We test the FMF Factory 4.1 KTM 450SXF exhaust and the Millennium KTM 2 70SXF big-b ore kit…

2014 KTM MOTOCROSS MODELS ? 85SX,125SX, 150SX, 250SXF, 350SXF, 450SXF

2014 450SXF The KTM 450 SX-F  has new engine case to reduce weight. The piston has been mod i fied for more durability, the DDS clutch get a 280 Nm clutch spring and a new three-layer cylinder head gasket to increase durability. The 450 SXF also features a lightened camshaft with a strengthened auto-decompression mechanism. 2014 350SXF All 2014 KTM models get a revised chain guide for more reliability and less weight. There is a new front brake lever, actuator and reservoir. The saddles have new fo…

HOW TO BUILD THE ULTIMATE KTM 250SX TWO-STROKE: YES, IT DOES HAVE WORKS SHOWA SUSPENSION ON IT

By Billy Musgrave I must admit that I inherited MXA ‘s KTM 250SX project bike by default. I was third in line, but eventually the end user. Jody had started the project originally, but he had other assignments and handed it over to my father, Willy Musgrave. I took over the project when my dad crashed at Glen Helen and broke his collarbone. It might seem mercenary, but it was a lucky break for me. I have been racing MXA ‘s 125 and 150 two-strokes for many years. Occasionally, I would get assigned to a 2…