Its not always about the big bore, Harleys should have releases. It is not so much about the compression you run but more about making the bikes start easier. When the releases are in use it makes the bike so easy to start as they just spin freely until the spark ignites the fuel mixture.
Your battery will last longer and so will the starter. All the new bikes come with ACR (auto compression release) so even the factory thinks it is a good idea. Put them in !!!


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