motojoe

It appears to me that your stator and the pickup coil has or is going out.  Look on youtube how to check a stator.

Check your oil level, check your fuel pump pressure and your ECU.  If the oil sensor is acting up then it will shut down the engine; also the stator and the pickup coil could be going out.

Check your oil, since it is fuel injected make sure that gas is not going in to the oil.  if your fuel pump or if it has a carburetor either way is stuck on then the fuel is going somewhere most likely the crankcase on on the ground.  If it has a carburetor then your needle and seat are not set right and fuel is flowing out as you drive, if it is fuel injection then the fuel pump is running  too high of fuel pressure and the fuel is going into the engine's crankcase.  Check your oil level and make sure gas is not getting into your crankcase.

If the timing gear broke that is on the camshaft there is no need to take apart the entire engine.  Take the Stator cover off and the flywheel, take off the timing chain adjuster off, put a new chain (if you want) and install a new camshaft and gear.  should only take a few hours not a bad job at all.

I could get spark if the crankshaft and stator are working, but if the camshaft is not turning then you could have a broken timing chain , a broken camshaft or the bolts backed off the timing gear that connects to the camshaft.  I have seen this situation many times on motorcycles.  Take off your camshaft cover and turn over the engine and you should find the problem right away, usually an easy fix.

Sounds like you clutch is not engaging or your belt has broken.

Depending how far you want to go as far as repairs, I would consider drilling out the center of the shaft and the threaded part and taping them together with a strong bolt and then welding the two pieces together and then shaping them by hand so that the other part of the clutch fits correctly.  Take your time it can be done.

It sounds like your "Low Oil" switch is not working right and is sending a message to the ECU that it is low on oil.  Check all the connections especially the one that connects to the oil sending unit.

If your UTV will not start or if you prime the throttle body and get it to run most likely it is a fuel pressure problem (fuel pump).  This is a common problem with all (big brands from USA, Japan and China) go down to the store and buy a cheap Fuel Injection tester and you will find that there is not enough fuel pressure.  Before you go ahead a purchase a new fuel pump check the connections and the grounds.