four-stroke

Bigger isn't always better, but when it comes to the KTM 350SXF it is!
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It revved to 15 grand, had factory WP suspension and bristled with KTM Power Parts components. The fly in the ointment was that the MXA testers were the last "regular people" to ever get a Factory Services works engine
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Only Stewie flew the smoker flag when the 2005 AMA National season started
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The whys and wherefores of 2015 quarter-liter thumpers. What brand were you racing in 2015?
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If you are from the school of thought that 450cc motocross bikes are too powerful for mortal man, this is your bike. It is definitely not too powerful for mortal man­­—or woman.
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Ducati announces their game-plan for race-testing the 250 and releasing their 450 to the public
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Back in 2014 the Kawasaki KX450F was a BNG bike that didn't even get BNG, but the KX450F engine was a thing of beauty. It was smooth down low, rolled on with authority and was the best all-around race engine of 2014.
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The 2025 GasGas MC350 has an organic frame geometry, which exhibits built-in stability, ease of use and an almost rhythmic tempo from corner to corner.
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What MXA thought about the YZ450F a decade ago. Looking back, we are surprised how much we likedit.
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This trail-blazing off-road machine is powered by a fuel-injected, 233cc, air-cooled, four-stroke, single engine. How does it run? Watch the video!
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MXA wrecking crew test impression—an uplifting dose of the truth
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CRF450 vs. YZ450F vs. KX450F vs. 450SXF vs. FC450 vs. RM-Z450
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The older brother of the National Champ is no slouch—neither is his Yamaha YZ250F
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The four-stroke that Yamaha Japan wouldn't build, but it got built anyway, then Yamaha USA wouldn't import it, so it was sold as a kit bike
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Believe it or not, the 2025 Husqvarna FC450 is the only 450 to crack the 60 horsepower barrier—yet it's still a pleasant powerband from low to mid.
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Sometimes you love a bike in spite of its flaws—that is what defines the 2014 Kawasaki KX250F
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The black sheep bike of the sport suddenly becomes the fan favorite thanks to Lance Smail, Doug Henry and mismanaged AMA rules
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The 2014 Honda CRF450 Is slow. We can't dance around the elephant in the room. It doesn't make much horsepower, and it signs off very early. One caveat: don't try to rev it out. It is most competitive when kept below 8500 rpm.
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Ten year ago the MXA wrecking crew was the first to put the magical 2008 Honda CRF450 up against the newest high-tech Honda CRF450 of the time
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GasGas adds two new two-strokes to the lineup while the other five returning motocross models receive a facelift
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If someone gets to ride the champ's bike — it might as well be MXA
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The 2014 winner versus the 2014 loser rematch, but which is which & could you tell the difference
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This isn't the economy model — this is the full pop version of YZ250F National-ready machinery
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Honda has confused us with a bike that delivers mixed messages
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As trick as any factory Motocross bike, but with specialized parts for off-road use
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Is the 2014 Husqvarna FC250 a KTM clone? Or KTM Plus? This MXA test tells the whole story in more detail then you'll need
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Much of the credit for the improvements goes to homegrown solutions, the ideas and concepts developed by local racers, hardcore KTM owners and the race teams, that KTM implemented into the 2014 KTM 450SXF.
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The MXA wrecking crew tested, documented, inspected, theorized and calculated every conceivable facet of the 250 four-stroke class for 2014. Your future bike now!
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But, If you “don’t have spark,” there is nothing to light the compressed fuel and air with. Spark is an a major part of the "Fire Triangle."
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