HARLEY Hydraulic Primary Chain Tensioner Fits 1965-1984 FL, 1971-1984 FX, 1984-2006 FXST, 1986

York chain tensioner features a hydraulic valve which controls the motion of the submerged piston which constantly keeps the chain in tension. This chain tensioner improves shifting performance reduces noise extends primary chain life and reduces vibrations caused by the primary chain. Tensioner is designed to automatically self adjust the primary chain tension even during acceleration and deacceleration. *NOTE: Head of adjustment screw should be 5mm out from body of hydraulic adjuster. FITS HARLEY: 1965-1984 FL, 1971-1984 FX, 1984-2006 FXST, 1986-2006 FLST, 1984-2006 FLT, 1984-1994 FXR, 1991-2005 FXD,