Originally Posted by JohnF
Doug, JohnF from Cincinnati. I had an '08 KLR and remember doing the "Carburetor vent line Tee modification". That modification was to install a tee in the float bowl's vent line. The reason was to allow any water that may have become "stuck" in the vent line to drain out. With the tee the bowl would be vented to atmosphere by a tube that runs upward to an always dry location under the tank as well as by the original vent line running downward. If the vent line becomes "plugged" with water the results are erratic fuel delivery. That's just a WAGuess but worth trying. Best of wishes for your adventure!
I have done that modification