I found an interesting test of the ATK 604 in the August 1990 issue of Dirt Bike, seems they liked it quite a lot.
Great article and good to see the ATK get some good press…ok, back in 1990 at least 🙂 But did you see the price for a piston/ring/wristpin?…yikes, $384 back then. But guess you wouldn’t hardly ever need one and that’s the price you pay for such a cool bike/engine!
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