I'll let the guys that actually know what they are talking about give you a proper diagnosis but I'd sit down while reading because I dont think its going to be good.
Doing the test while warm isnt going to make up that kind of difference you definitely got something major (major to me anyway because I dont know how to tear down a motor) going on.
Sorry to hear of your troubles....biggest fear most everyone has when buying a used boat....hopefully you'll get out this jam with a dollar figure you can live with and start fishing!
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1986 V-20
1986 Yamaha 150 HP
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