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A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...
A tappet or valve lifter is a valve train component which converts rotational motion into linear motion in activating a valve. It is most commonly found in internal combustion engines , where it converts the rotational motion of the camshaft into linear motion of intake and exhaust valves, either directly or indirectly.
It was the first Honda motorcycle to wear a CBR badge. The CBR400R (NC17) naked bike was launched in December 1983. The 4-valves per cylinder, liquid cooled, four-stroke, DOHC, inline-four engine has a rotational-speed valve stop mechanism "REV" (a prototype of Honda's VTEC system) that changed from two valves into four valves at 9,500 rpm.
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Honda RS 150/Honda RSX/Honda Winner X The Honda Wave , also marketed as the Honda NF series (codename), Honda Innova in Europe, and Honda Supra in Indonesia, is a series of motorcycles manufactured by Honda that debuted in 1995 with an underbone design, having separate cosmetic plastic body panels over a structural steel tube chassis.