…four-valve orientation. However, that's about all the ATK has in common with the other three. Instead of the normal rear-mounted carburetor and forward facing exhaust port, the cylinder is reversed on the American bike. In place of the carb, ATK uses an electronic fuel-injection system to deliver combustibles…

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…HP2 and a legalized ATK 450 on loan from Oregon's Best Motorsports while our accompanying photographer, Tyler Maddox, borrowed a DR-Z400E from Moffet's rental company.The collection of bikes gave us a terrific picture of where the HP2 would stack up in the dual-sport world. The ATK was basically a motocrosser…

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…ergonomics of it feel awesome. The motor's good, but then the top end gives out a little bit and the Honda's a little stronger there.?You go, Slick.The ATK belongs in the army - it's like a tank. They need to change a lot of things because they have so much going on with it. It's a really heavy bike. Its…

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…jarring impact to the rider. That is, unless you decide to freestyle on it, in which case the soft suspension gets overwhelmed by big hits.With the ATK playing a role in this comparison, Sherco wasn't alone it the fuel injection category. The Sherc's electronic system isn't as impervious to high-pressure…

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…outdated doesn't mean that it won't hang with the group. This bike stands out from the crowd with its expensive componentry and unique design.2006 ATK 450 EnduroThe Crowd PleaserMotor-wise, the American machine makes plenty of noise with its whiny fuel injection and wide-ratio, cassette-style 5-speed…

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…we decided that getting our hands on the obscure Spanish 4.5i was worth it even though it was one model year old. Finally, we sent our American-made ATK back to Oregon's Best Motorsports for a freshening up and transformation from motocross to enduro specs. The makeover included adding a lighting system…

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…MotorcycleUSA's 2006 450F shootout.As is probably rather obvious, the ATK, while interesting and unique on the track, didn't get the greatest performance reviews from any of our riders. Considering the antiquated, bulky chassis and tame motor, the ATK could have been simply neglected from the start, but our riders…

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…but failed to eliminate the jittery feeling the made it seem as though the internals were clapped out.If any bike had the opposite feel it was the ATK. Beautiful, gold Ohlins components graced the front and rear and felt extremely solid."Ohlins are usually known for their tighter tolerances," said Tom…

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We don't recommend staring down these 450 machines. Make a habit out of it and sooner or later they're bound to kick your ass. From left, the ATK 450 MX, Suzuki RM-Z450, Honda CRF450R and Kawasaki KX450F.The bigger the better, eh? Well that is the American way, and motocross in the USA will live and…

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…track. Regardless, a supremely well-balanced package make the Kawi a particularly nasty airborne pathogen.The Skinny I mentioned the extra pork on the ATK discovered by our scales. We could tell a difference just from attempting to lift it onto a stand, but the point is that weight is another all-important…

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