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http://www.atvnewnused.com/Motor-Cycles How to Adjust Harley Davidson Motorcycle Shocks. Part of the series: Repairing Motorcycles: DIY Maintenance. Shocks and suspension in a motorcycle will help to absorb changes in the surface. Learn tips on how to adjust the bike shocks and suspension system in this free Harley Davidson Motorcycle maintenance video
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Pre-load adjustment
The pre-load on a rear shock is typically adjusted via a threaded or notched collar on the shock. As the collar is rotated, the coil-over spring is compressed more or less. The more the spring is compressed, the higher the pre-load, and vice versa.

Some shocks, known as air-assist shocks, allow adjustment of preload by changing the air pressure inside the shock. A valve on the shock allows air to be introduced or released from the shock. More air pressure gives more preload, and vice versa.

On motorcycles with twin shocks it is very important that both shocks have the same pre-load. Dangerous handling and braking characteristics can result from dissimilar pre-load adjustments.

Damping adjustment
Stock rear shocks typically offer no damping adjustment, or a single adjustment for both compression and rebound damping. This adjustment is usually made by a dial at the very top or very bottom of the shock. The dial selects one of a few different orifice sizes for the damping fluid flow path. The larger the orifice, the less the damping, and vice versa.

On motorcycles with two rear shocks, it is very important that the damping on both shocks be set the same. Dangerous handling and braking characteristics can result from dissimilar damping on the rear shocks.
Wikipedia.com
Harley Davidson Shocks