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16 hp Briggs and Stratton compression.

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I have a 1984 Simplicity 6216 with a B&S twin cylinder L head engine. The compression is supposed to be 90-110 psi but mine is running 75 in one cylinder and 65 in the other. It burns no oil and seems to run strong. I am wondering where I need to start looking for the compression loss. It is the origional engine(by the numbers on it),but does not have a lot of wear. Could the problem be in the valves? The tractor was not used for the last 3 years. Any help would be appreciated. Thanks, Roy Wooten

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