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  1. K

    115HP Mercury 1974 Compression Test

    Hello everyone! I rented a compressor tester at autozone and checked my v6 mercury outboard engine. These are the procedures that I did for the test. 1. removed all spark plugs and spark plug wires. 2. connected the tester to the port for spark plug #1 3. I cranked the engine for five times...
  2. K

    115HP Mercury 1974 Compression Test

    Hello everyone, I need help on how to do the testing for the compression for this 115 hp mercury v6 outboard. I actually tried to do the test this morning and the number came out as below Cylinder # 1 70psi when it is at 1000rpm and 130psi at 4000rpm Cylinder # 2 70psi when it is at 1000rpm...
  3. K

    1975 mercury 115 hp engine not working well

    Hello everyone. I need help on my 75 mercury 115 hp outboard engine. The engine runs perfectly on neutral and on rear if the propeller is out of the water. However, if the propeller is in the water then the engine run properly only in neutral mode. I shift it in rear, then the engine lost...
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