motojoe

If you already replaced the stator and the pickup coil make sure that all your connection are connected. Crank it over by the starter motor and hook up the wires from the stator to your test meter to determine if power is coming out of the stator, then check the coil to determine if your are getting power.

On your picture I see camshaft gear and marks but on the head there should be marks to time the camshaft to. Unless that grease mark on the top of the picture is a timing mark your are out of time by at least 40 degrees. Find the timing marks on the head and line up the camshaft timing marks.

Sounds like you have an air bubble in the cooling system. What you need to do is jack up the front of the side by side with the wheels off the ground and bleed the system and fill the radiator.,

Just look on your original starter motor for a manufacture's name or a part number, then look up the part number on google and buy it from any of the vendors that come up BMS is usually way over priced. I have a ranch pony and have really good luck with it but most of the parts from Chinese side by sides use the same parts.

Need more information: Do you have spark? Is your fuel pump working? Is your starter working?

It appears that your stator pick up coil is going bad

When filling the radiator to bleed the system make sure that the front of the vehicle is jacked up higher that the engine to get the air out. Sounds like you still have a air bubble.

your brake switch is bad.

Check your connections and it is probably your starter solenoid.

Take your thermostat out, it may not be working also bleed the system as you may have air cooling system.

Check your thermostat, make sure that it is not stuck, to check put it into hot water to see if it opens.

It appears that there is something wrong with either the carburetor or the fuel injection. If it is carburetor engine then the needle and seat is not sealing or your fuel pump is staying on. If it is fuel injected then your fuel pump is staying on when the engine is off. Either way make sure that your fuel pressure is fixed before you run the new engine or it will fail again.

Look at the "Man Hole" threads and you will find a cut into the threads, line this up to the flywheel timing marks and that will be your TDC.

Just for fun if your compression is as low as you say check the valve adjustments a tight valve could cause the loss of compression and also cause it not to start.

Replace your stator and it should come with a pickup coil. that should fix your problem.