Sounds familiar my klr has done this a few times over the years. If it is a fuel problem most likely problem is water in the fuel has got into the carburetor, even a small amount will blog the jets.
First step is to drain the carb bowl, you'll find a small screw on the bottom right hand side of the carburetor. Undo this a few turns, no need to take it right out, and fuel should come out of the carburetor drain pipe and drop on the ground beneath the bike. Do this with the fuel tap switched off and empty the carb. Now switch fuel on and if this was the problem most times the bike will restart. If it won't is possible that water or muck is still in the carb jets and the only way out is to take the carb off and then remove jets and blow them through.
Note it's also possible that draining carb will only temporarily solve problem or bike still runs rough after because not all the water comes out. For this reason after this happens I usually try and put a bottle of carburettor cleaner (or fuel injector cleaner, is basically the same stuff) in the fuel tank; this product dissolves water into suspension and let's it be cleaned out as part of the normal engine processes. Good luck, Hope it's as simple as this.
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