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94 evinrude 150 with no compression in two cylinders

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bpud1

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I need help diagnoising probl

I need help diagnoising problem
I was cruising at about half trottle for about 4 miles when engine slowed down and then stopped
I restarted but then I could only do about 3o mph at full throttle useally my boat will do aroung 65 mph. I replaced spark plugs same thing> I checked the presure from each cylinder with my thumb 4 had good presure and 2 had none. no warning horn sound what could be the problem
thanks for any help
 
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