these pics are great! Tell a lot more about how bad it was then the single photo on the main website. I ended up pulling the intake bypass and carb today, and my motor is going to need a full teardown to clean the crankcase and intake manifold. There is so much stuff in there, the mice even made their way down the carb throat (the carb is no good, thankfully I have parts motors).
I suspect that the motor should be OK once I put it back together (which won’t happen until this winter), but we’ll have to wait and see what happens.
I worked on another 25hp, a 1976 motor today, that was seized on receipt. I pulled the cylinder head to find both cylinders *appearing* OK with exception of aluminum flakes in the top cylinder. After wacking away at the pistons with a wood block and 6lb hammer, I was able to get it to turn over freely, with exception of a sticking point at BDC for cylinder 1. I suspect a bearing went, or the crank is no good. Piston #1 isnt extending out as far as piston #2 at TDC, so I suspect the crank might even be broken, or the needle bearings blew up.
Strapped the cylinder head on and had 70/125, and piston #1 isn’t going to TDC by about 1/8 to 1/4 inch. Interested to see what happens when I open this one up in a couple of months and will repost pictures and results for both motors once I get done with the respective projects. I’m wondering if the slight hesitation when cranking under compression on cylinder 1, along with the shorter power stroke, will make a huge difference in compression…
Yes, I am a nerd at heart.
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