Have you checked the fuel valve needle and the float? Seems it's not shutting off the fuel when the bowl gets full. Not leaking enough to be an issue running, but allowing it to sit overnight lets what fuel you have in the line drain to the bowl, thus overfilling it, then it drains into the crankcase. It should run out the overflow hose, but it always doesn't. Try this: get it running, turn the gas off, run it dry. Let it set over night, turn gas back on, give it time to fill the bowl, and see if it will start. If it does, this is your problem. Replace the fuel valve needle, (make sure the seat is clean)and adjust the float to specs.
Your jetting is fine, make sure the needle is in 2nd clip from the TOP. You might have to go to a 40 slow jet to really clean up the bottom, especially since you put the Boyesen's in, and if you have a pipe on it.
__________________  The "other" ZZR rider.
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