my GF just bought an 89 XL, came into the garage the other day to a huge puddle of gas on the floor. After some investigation found that thetank had drained through the over flow on the carb, (petcock in the on position). First thought was carb float set too high, so I removed the carb and reset float to where the valve closed with the float in the up position, cleaned the bowl and sprayed carb cleaner through every port and jet, all passages appear to be uncloged and flowing freely. After reassembly put gas in the tank and fired it up with no issues, bike runs great. But after shutting it off and leaving the petcock open it is still leaking fuel through the overflow on the carb. I am not very familiar with the Mikuni carbs and was wondering if anyone else is familiar with this issue? With the bike running the is an occassional drip from the overflow tube.