If you are SURE this is an 85 140HP EVINRUDE, compression should be up around 140-150 on it during cranking with a good battery. With 0 on one, I wouldn't put any money into it until you find out what is wrong with it. Could be a bad head gasket, but 85-87's were known to run hot and gaul the pistons. I would start by pulling that head off and see what teh cylinder looks like. be careful though as that engine has plain steel head bolts and they break off fairly easily if your not careful.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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