Bike turns over most of the time but somtimes wont

Have you checked your battery voltage at the starter while the problem is happening? That will tell you if it is a wiring problem or a starter problem. If the voltage is low sometimes (and you know your battery is good and securely connected) then you have a wiring problem, broken or shorting somewhere. If the voltage is steady while the problem happens your starter could be failing.

If you have recently performed some maintenance on the motorcycle, the timing could be off or your throttle bodies may not be all the way back into their rubber boots. Either of those things should also cause poor running and backfiring.