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Check the Flywheel key. It should be locked under the pull cord, where the stator is located. I will be a small piece of metal that slides into the spline from the engine and the stator. If it is worn the stator will rotate off the spline and the timing will be off, she won't start and if she does will be really rough and backfire, sputter and have power loss.
Sounds like the float bowl in the carb is sticking, go get a can called "Sea Foam" from your local parts store add about half the can to a full tank of gas take it for a good ride it will clean out any gunk and deposits in the carb and make it run good again i had the exact problem you are talking about with my wife's Suzuki Eiger 400 i let it sit for 5 months and it caused the carb to get all gummed up i ran Sea Foam in the gas and it runs like brand new again after riding it for about 45 mins.
check oil level, there is low oil sensor in case, when stopped all oil runs back down into case this alows it to start then it starts pumping the oil throughout and results in low oil shutting down engine (safety sensor) your probly down a liter or so
most likely a fuel issue. has it been sitting up ? if so if its got a carb it prob gummed up, pour some seafoam into the gas tank with fresh gas and run it, try and keep it running with the throttle, it might clear some varnish out the carb if it not too bad, if tht dont work and it is a carb engine then the carb will have to be removed and cleaned. if it a FI engine then you got a bad full pump more than likely
Sounds like you have a problem in the charging system. The alternator is giving the system enough charge with no lights but cant keep up when lights are on. This also happens if you are running other lights without being correctly connected through a relay.
It appears that you have fuel venting problem or a float level set too high. Check the entire fuel system for kinked / blocked fuel lines/ filters and check the float level or fuel manifold pressure if it has one.
I have a 2004 700 carb that shut off while riding and then would start up 3-5 minutes later after many nights working on it Ifinally figured it out no help from any dealer. There are 2 circuit breakers under the front rack mine were very rusted, Replaced both never had the problem again. My situation was always only when the lights were on.
Hope this helps