Powervalve Cover $ 30.00 SKU: TZ250 Powervalve Cover (4DPPVCVR) Powervalve cover to suit 1991 - 2002 models. Back to: Engine Parts (Top End) ×Close Yamaha Yamaha is a leader in businesses ranging from musical instruments and audio & video products to information technology products, new media services, home furnishings, auto components, specialty metals, music education and resort facilities. http://www.global.yamaha.com/ Description Powervalve cover to suit TZ250 1991 - 2002 and all TZ125 models.