i just sold my ZZR250 on ebay because i havent ridden it for over 2 months. the mourning of the guy coming to get it i start it up and it runs fine so i switch it off. the guy comes from newcastle (im in SW Sydney) by train and goes to test the bike and it loses all power. he rides it down the street and comes back with the bike stalling. lucky the guy is nice and understanding so we go about diagnosing the problem. first we drained the tank to near empty then ride it to the servo and get a full tank, bike doesnt make it back so we push it. bike has spark to both cylinders, and it feels like a fuel issue anyway. we pull out the carbs, check everything and it seems sweet. blow out all the lines and jets, check the float etc and its all good. put it back together and the same problem. i start it, ride it down the street, boot it up the hill and its good but then just cuts out, cant even clutch it down the hill. any ideas? could there be a problem with the fuel tap?