I have a 98 RMX250 and it slowly leaks petrol out of the hose at the bottom of the carburettor bowl (overflow??)
I try to empty the carb after every ride by running it dry but it still seems to leak and is stinking out the house with petrol. It is just slowly dripping, nothing major but still would like to resolve the problem.
You should probably check your float level, As the inlet needle wears, the float height tends to get affected quite a bit - if this doesn't help try replacing the inlet needle and seat.