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honda rc51 showed that this open-class v-twin superbike has what it takes to whip any ... your memory the rc51 still uses a 999cc 90-degree v-twin engine liquid-cooled with twin ... gear-driven overhead cams four-valve heads ram air and direct shim-under- ... bucket valve actuation with a 16,000-mile service ... than conventional steel liners the twin side-mounted radiators let our ... 3000 rpm enjoying the fat torque curve v-twins are famous for but slice through an ... all the fuss is about rc51 rc51 big twins can be notoriously fussy when it comes ...