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  1. L

    1986 9.9 serial number 0A945913 no start

    After trying many possibilities, no start. Not even trying to start. with new piston rings , now have 75 psi and 70 psi. no scoring in cylinders, piston skirts looked good. took new plugs out and poured gas mixture, plugs right back in - nothing kill switch disconnected or hooked up- same...
  2. L

    1986 Mercury 9.9 serial 0A945913 piston rings

    Please help. I'm having trouble purchasing piston rings for my 9.9 Mercury, serial number 0A945913. The old, i,m sure piston rings measure .024 and are stainless steel. I have ordered and called Boats.net to purchase the replacements and they have sent 2 different ring sets that measure .062...
  3. L

    1986 Mercury 9.9 zero compression in both cylinders

    recently purchased a 9.9 Mercury outboard. Had 65 PSI in one cylinder and 80 in the other. I installed the Bars Leak High Mileage engine repair. Let it sit for 2 days, with the plugs out, cleared the cylinders by pulling the flywheel by hand- rope start- then checked compression and has zero in...
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