Spring spacer engagement shim. This shim is designed to go under the spring in the primary clutch to raise the engaement rpm. Most applications see an increase of 150-200 rpm by installing this shim. You can install up to two shims in most applications.
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I had a big problem with my Polaris Ranger North Star trying to creep forward in high and hard to shift. I put one spacer in and even when I turn on the AC and the AC comes up I do not have any problem with shifting or at trying to creep forward anymore perfect fix