sorry if this is long but... my mate brought round his GPX 250 last weekend cause it had a bad oil leak. we park it in my garage and a little bit leaks out but not heaps. so that day i take the fairings off and clean the underside of the engine with carby cleaner and started it up and let it run for a while then left it to sit. up until today no oil had leaked out so i thought maybe it had none (i couldnt see anything through the sight glass) so put about half a litre in, still couldnt see anything so put a bit more in. didnt know if it was empty or over full. started it up and let it run, no oil leaked out. so i took it for a run, get a couple of blocks away and pull over the side of the road and oil is GUSHING onto the road. have a quick look and its coming out of the air box on the kickstand side. take it home and park it on the street and there is heaps of oil running down the road from the airbox. anyone have any suggestions?