Practical Sportsbikes (UK) - - News -

By con­stantly ad­just­ing the in­ter­nal di­am­e­ter of the ex­haust to suit rpm, EXUP (Ex­haust Ul­ti­mate Power Valve) boosted low to midrange drive with­out com­pro­mis­ing top-end – one rea­son why the YZF was the most pow­er­ful and high­estrevving sports 750 while also boast­ing a fat, lin­ear midrange de­liv­ery.

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