@ Listerational
Don't use the ether for starting!!!!!! Damage to the piston rings can result.
When turning over the engine, can you hear the injector creaking? If not, you'll need to bleed the fuel system.
If yes, is there good compression?
If no, is a valve stuck open? Are the rings seating?
If compression is good and you have injector creak, , and it is cold (as in near freezing temperatures) remove the air filter and use a propane torch directed into the intake to heat up the intake for a couple of minutes, then try a start.
That's the short version.
Always worked for me, even when there was ice on the flywheels!
Cheers
Hugh