motojoe

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.

It appears that you are missing the gear sector (picture #2) on your new part. For your new part you will need the "selector" that is made for your new part. Why not clean up your old part?

Check out the "Run Low on Oil" sender; make sure that it is plugged in and works. Sounds to me that something like the oil sender has a timer and is causing your machine to shut down.

Get the engine number off the engine block and Google it and it will tell you the manufacture of the engine. Then look up the proper way to time the engine.