Sounds like it leaned out on yeah. Like I was saying in post #2 about your plugs, that one plug REALLY concerned me from the white on it. When you say it acted like a dead battery after a hard run, that is a direct indicator of a stuck piston. Chances are you smeared it when you tried to start it and it didn't kick right off. The rattling is most likely a smeared piston skirt that is rattling against the cylinder wall. Been there, done that. 140 is hot if that is what it was cruising, an old school looper should run 140-170 at idle and IMMEDIATLEY drop to about 100-120 at 3000-4500 and bump 130 maybe 135 under WOT on a hot day. Pull the head on that side and look for signs of aluminum stuck to the cylinder walls, but the head needs to come off.
Let me know if it's bad, my 140 could be made available if it's bad and you don't want to build it.
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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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