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1996 Mercury 25 compression spec?
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<blockquote data-quote="Skiffing" data-source="post: 388516" data-attributes="member: 15889"><p>I'm not surprised by those low readings. The test was done incorrectly.</p><p></p><p>According to the 1996 merc manual for 25 hp 2 cycle max compression is 180 psi. Minimum is 127 psi. Below 120 indicates problems. No more than 15% difference between cylinders.</p><p></p><p>This manual is on boatinfo.no</p><p></p><p>Procedure:</p><p></p><p>Run engine until thermostat opens.</p><p></p><p>Remove all plugs. Hit kill switch.</p><p></p><p>Install gauge.</p><p></p><p>Open throttle plate to WOT and crank. Stop when highest reading is achieved. </p><p></p><p>Rinse and repeat.</p></blockquote><p></p>
[QUOTE="Skiffing, post: 388516, member: 15889"] I'm not surprised by those low readings. The test was done incorrectly. According to the 1996 merc manual for 25 hp 2 cycle max compression is 180 psi. Minimum is 127 psi. Below 120 indicates problems. No more than 15% difference between cylinders. This manual is on boatinfo.no Procedure: Run engine until thermostat opens. Remove all plugs. Hit kill switch. Install gauge. Open throttle plate to WOT and crank. Stop when highest reading is achieved. Rinse and repeat. [/QUOTE]
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1996 Mercury 25 compression spec?
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