Hello its been a while now from I have posted on here. Anyway I have a 1977 fs1e dx and have this problem with the carburettor . It does not do this all off the time but if you go to start bike, and turn on the fuel it comes running out of the bottom of bike. Turn off fuel then start bike and its ok to turn fuel back on. Now after a run out I turn off the fuel and run carb out of fuel. However come back in a hour and theres fuel on the ground, whip it up but it keeps doing this for a few days ? I took the casing off and it seams to be coming out off this hole see picture. I have tried changing carburettors over as I have a new one but same problem, and yes when fuel tap is off no fuel comes down pipe. I dont really think anyone will have a fix. its a mystery to me one crab yes but not on second and they both seam fine floats and shut off work ???