Knowledge Centre

Learn why Harley-Davidson fork seals leak, what fork oil does, how to spot wear and what to check when servicing or rebuilding motorcycle forks.

Learn when a Harley-Davidson clutch cable needs replacing, how handlebar changes affect cable length and what to check when choosing a replacement cable.

Organic, sintered or semi-sintered? Learn how motorcycle brake pad compounds differ and how to choose suitable replacement brake pads for your Harley-Davidson.

A detailed guide to Harley-Davidson® electronic fuel injection, explaining the ECM, injectors, fuel pump and pressure, throttle bodies, MAP and oxygen sensors, fault codes, modifications and proper EFI diagnosis.

A practical guide to Harley-Davidson® engine mounts and vibration, covering rubber-mounted engines, stabiliser links, normal versus abnormal vibration and common diagnostic clues.

A practical guide to Harley-Davidson® wheel bearings, covering wear, inspection, common symptoms, water ingress, ABS bearing orientation, spacers and correct installation.

A practical guide to Harley-Davidson® brake pads and discs, covering pad compounds, wear, disc thickness, uneven wear, brake noise, contamination, bedding-in and common braking problems.

A practical guide to Harley-Davidson® motorcycle clutches, covering how they work, adjustment, slipping and dragging, cable and hydraulic systems, clutch plates, springs and common problems.

A practical guide to Harley-Davidson® motorcycle charging systems, explaining the battery, rotor, stator and regulator/rectifier, common charging faults and useful diagnostic checks.