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MichaelR said..
Oh dear....
In order, I'd do the following. Some of which has been mentioned above already.
Take a multimeter and check the current state of charge in the battery. If it's less than about 12.5 volts, it's not going to turn over anything.
If it's showing good charge. Remove the battery terminals, clean and re-tighten them. Then try again.
If it's showing low charge, I'd still clean the terminals, then get a jump start pack - or a spare battery with good charge and good leads. Pull out all the spark plugs and see if it will turn over.
If it does turn over, put the spark plugs back and with fresh fuel in the tank, try again.
If it still won't turn with the key, check the connections to the starter motor, and the starter fuse, they're usually on the starboard side of the engine down low in a big fuse holder. It may be that the starter has seized, or the solenoid has stuck and is not engaging or the jackshaft is not disengaging. You can try hitting the starter and solenoid with the end of the handle of a hammer, whilst someone is trying the ignition key. If the starter is the problem, this will usually free it up, but will still require a new starter motor in the near future.
If it still won't turn, and if you have good charge, leave the spark plugs out and try to turn the engine with the breaker bar and socket on the flywheel nut. All you need to do is move it in either direction, with the spark plugs out. If it moves, then it's definitely not seized.
If it still won't turn over after all the above, then you may well have a seized motor. Drop some diesel fuel, or even fill the spark plug holes with WD-40. Leave it overnight and try to use the breaker bar to try to turn it the next day. If it still won't turn, then you need to pull the heads and try what Lazzz said, with the block of wood and a hammer.
Hopefully it will really just be a battery problem, and possibly a slow starter motor.
I second the motion of calling Blue Moon, he's good. If I was up there closer I'd be happy to have a look for you.
Hi, this is all really good advice, I would just change the ordering a little if it were mine.
The first thing to do is rule out a mechanical issue before tackling the electrical side. Buy or borrow a socket (for bolt on end of crankshaft) and breaker bar to turn the engine over with and a cheap oil can, any chinese cheapy will do. Remove all of the spark plugs and squirt a couple of squirts of engine oil in each spark plug hole( engine has been sitting and bores will be dry if not seized).
Then try and turn the motor over by hand, you should need a bit of force to get it to start to turn then it should turn easier. On a 18" bar you should not need to exert more than 20 or 30 pounds of effort. If it does not move then you will probably need to remove the cylinder heads and see what is going on inside.
If it does move freely follow the rest of the advice above, and remember if you do get it running change the oil and start it every few weeks after that.
Mike (mechanic 30+ years)