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    1997 120 hp Lower Unit - no reverse under load

    I can shift into reverse on the muffs, but not in the water. After eliminating the shift cable adjustments and failing to find a used lower unit locally in my price range, I decided to open it up and see what I could find. Here is what I found...
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    Mercury Force 120 Brand New Quicksilver Thermostat

    I just installed a brand new 130 degree thermostat, Quicksilver part number F664068 from a lot dated 09/07/10. I notice that there is no tell-tale stream. I remove the freeze plug, connect a hose and I have enough flow to put out a 5 alarm fire. So, why is the thermostat not opening? I take...
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    120 HP Force Fuel Pump rebuild and check valves

    My fuel pump check valves are shown here with retainer rod installed. The check valve has a plastic disk only. The rebuild kit (Sierra 18-7817) has a clear plastic disk and a rubber disk. The service manual shows these as plastic disk and check valve. If I follow the manual, I install both...
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    1997 Force 120 lost power - bad cylinder #1?

    Compression performed by dealer as of April 2014 when I took ownership - 1) 150 2) 150 3) 155 4 ) 155 First 10 hours, no powerhead issues. Now, it has no power and won’t go over 1500 rpm. Starts with no problem. Problem occurred on the water when attempting to get up on plane...
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