I was Flushing my 2005 Mercury 125 HP 2 stroke outboard in November 2016 with fresh water as it is used in salt water. The muffs were hooked up but water wasn't peeing (it always takes a while with the muffs - scary long sometimes) anyway this time I was waiting, and went inside to answer the phone while my dad monitored the boat. He did not hear the overheating alarm and when I ran to shut it off it made a pop noise and stopped. Well... I put her away til the summer and feared the worst. So this summer I got her out and tried turning the fly wheel. it will turn almost 360 degrees and go all the way back but something is stopping it from rotating all the way. took out pistons (<--- EDIT--- thats a typo... i took out spark plugs )and I can see that the pistons all move in and out smoothly. I assume the crankshaft and connectors are intact. Took off the lower unit and does not seem to be a problem there as the rod rotates completely and turns the prop. Any ideas?
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