Agree completely with Dave. Helped a guy earlier this year to free one up. I didn't get anywhere with the penetrating oil so asked him to pick up some acetone and transmission fluid.
I mixed 1/3 transmission fluid with 2/3 acetone...very light consistency and poured it in the plug holes. NOTE: if you do that take the carb off because it WILL flow into the carb and you will have carb issue when it comes time to start it. I think you said it wasn't started in a couple of years so the fuel, filters and a carb cleaning will be necessary anyway...so take it off.
Put a cup or something underneath where the carb is mounted under the exhaust manifold. Pour you mixture in the top end and wait overnight. Small movement back and forth on the crank and when it starts moving a little bit add a little more of your mixture. Sometimes it will move 1/8 of an inch then go back and forth.
Can be repeated.....oll changes will be required after doing this because acetone and oil are not buddies....we will deal with that when you get it moving and see where you are with it. Looks like a decent engine....hopefully it won't be too bad.
...and welcome to the forum.
Mo
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Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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