Engine Type

The GasGas MC450F is not as affordable as it once was, but it is still a sweet bike that captures riders’ hearts with its fun nature.
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We tested each bike in its stock form, and put 20 hours on each bike to, try to make them ultimately comparable to each other and to keep things equal we installed the same tires on each bike
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Our tune has changed... Thank you, Yamaha
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The King of 250 Two-Strokes had no rivals for the throne in 2014
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If you own a 2023 Yamaha YZ450F, then you already own a 2024 YZ450F—except with more hours on it than the new one on the showroom floor.
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Even though there are fuel-injected two-strokes, all the motocross versions require oil to be pre-mixed into the gasoline. When adding gasoline with oil pre-mixed into it, the internal parts of the engine are lubricated as the engine runs.
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Our best advice? Turn right to go left, speed up to slow down and ignore everything you learned by racing motocross
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With some reasonable modifications, a CR450 can be transformed into a desert racer, enduro bike, supermoto bike, dirt tracker, TT racer, sidecar racer or even a road racer
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The MXA wrecking crew matches its motocross skill against the KTM X-Bow
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Honda wouldn't give us Sexton's or Roczen's works bikes for the weekend, but Honda's Johnny Campbell gave us one
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Over the last couple seasons, Josh Mosiman has been racing select AMA 450 Nationals on MXA test bikes—in 2023 he raced a Yamaha YZ450F at Pala, a Gas Gas MC450F at Hangtown and for this edition, he raced a Honda CRF450 Works Edition at…
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After racing a Yamaha YZ450F at the opening round of the 2023 AMA 450 National Championships, Josh switched to a GasGas MC450F for the second round at Hangtown. Here is what he did to make it race ready
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Taking testing to the nth degree—inside MXA's Yamaha YZ450F as set-up for the 2023 Pala 450 National
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In 2004 Kawasaki had just launched its all-new KX250F. The team offered the four-stroke to James, and he tried it during the pre-season. He decided to stay with the KX125 two-stroke instead
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The wild and wacky story of how Yamaha got into the dirt bike business and the cast of characters that made it a success
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Why the long dreamed of Great American Motocross Hope was a total flop
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RC, DeCoster & Goose tell all about the bike that everyone who was anyone in 2005 remembers
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Was the KTM 380SX faster than the KX500 and CR500 of their times? Yes and no. Could big two-strokes ever come back? No, but mid-size ones could
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Riders of Ken’s caliber are usually locked in from one factory contract to the next, but, in this case, Ken and Honda split at the last minute, and the stars aligned HEP, Suzuki
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For a few years now; the YZ250 Yamaha has falling behind KTM, Husqvarna, GasGas and Kawasaki on horsepower numbers, but the YZ250 makes up the difference if you stay in the meat of the powerband.
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No offense to Kawasaki, Suzuki and KTM, but their combined motocross bike sales didn't equal one-half of the numbers put up by Yamaha and Honda in 2004
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For the average novice, vet or play rider, the existing RM-Z450’s power is located in the perfect spot to get the job done; however, pros and high-rpm revvers will not like the RM-Z450 powerband
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