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What causes no compression in a hummer mill

May 18, 2010 1,819 Posts. #2 May 1, 2010. Sounds to me like the auto decomp on the cams is staying open. Pull the cover n see, if they feel fine, pull them out, if it gains compression then either cams or messed or valve adjustment way off. If still no comp a valve is bent or about to drop or the rings are installed completly wrong or the heads warped hard

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