Webapr 26, 2020 · doing a compression test on the 1983 mercury 50hp 2stroke. Webdec 15, 2011 · i am currently looking at a used boat with a 2002 50hp mercury 2 stroke engine. The private owner says the compression test shows each cylinder at 150 psi. Most will produce cranking compression readings in the 90 to 105 psi range, depending on. Webmay 1, 2016 · i have a 2005 merc 50 hp 2 cycle and mine are between 114 and 118 which i thought were low but i have…