Polaris ATV Forum - View Single Post - Tech support question of the week Sportsman 500
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post #7 of (permalink) Old 03-04-2013, 01:39 PM Thread Starter
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Join Date: Feb 2010
Location: Cincinnati Ohio
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You are correct it only releases the compression at very low RPM's, the ball bearing on the cam rides on the lifter and the spring and counter weight work on centrifugal force so once the rpm's come up the ball bearing lowers allowing the valves to seat completely. At least that's my best guess on how it works.
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