Manual cam chain tensioners are designed to replace the automatic and hydraulic tensioners on high-per suitable for mance engines. The automatic adjusters can back out when the throttle is closed suddenly at high rpm. This allows the cams to go momentarily out of time, and can result in bent valves and/or serious engine damage. Hydraulic tensioners have a tendency to put too much tension on the chain guide under high rpm/high oil pressure conditions, resulting in premature wear. Both problems can be eliminated with the installation of the manual tensioner. No matter what the engine does, the cam chain tension will remain constant. An manual cam chain tensioner is a must suitable for any kind of per suitable for mance riding. Manual tensioners are CNC machined from billet alloy to exact tolerances suitable for perfect fit. Condition: 100% New Color: Black / Red / Blue Material: Aluminum + Steel Fitment: suitable for 1991-1994 CBR600F2 - HURRICANE 600 / CBR600 F2 suitable for 1986-1990 CBR600F - HURRICANE 600 / CBR600 F1 Package Included: 1 x Manual Cam Chain Tensioner Instructions is included