Primary Chain Tensioners / '07 & Up Big Twins

The PSR Manual Primary Chain Tensioner replaces the automatic tensioner on '07 and up Big Twins with a billet aluminum unit you set by hand.

Factory automatic tensioners apply whatever pressure their spring dictates, and on a high mileage primary that often means more than the chain needs. Excess tension is not free: it costs power and it wears the chain and sprockets faster. A manual tensioner hands that decision back to you, which is why shops building serious primaries reach for one.

Why Riders Fit the PSR Tensioner

Setting tension by hand means you can dial in the slack the chain actually wants instead of accepting a spring's guess, and that directly addresses the premature wear that comes from running too tight. The body is precision machined from billet aluminum, so it fits without shimming and holds its adjustment. It mounts with OEM hardware, which keeps installation short. The black finish tidies up the primary at the same time.

PSR Tensioner Specifications

• Manual adjustment, replaces automatic tensioner
• Precision machined billet aluminum
• Mounts with OEM hardware
• Black finish
• Fitments: '17-'21 Milwaukee-Eight models; '07-'16 FLHT, FLHR, FLHX, FLTR, FLTRX, FLTRU and '09-'16 FLHTCUTG, FLHXXX; '07-'17 FXST and FLST with '06-'17 FXD and FXDWG

Setting Up the PSR Tensioner

Manual tensioners require you to check and adjust chain slack at service intervals rather than trusting an automatic unit to handle it. ⚠️ VERIFY your model year and primary configuration before ordering, and follow the factory chain slack specification when setting tension.