I have a 2002 Kawasaki Concours. All the fuel drained into the crankcase.?

common problem with the concours , check out the concours owners group (cog) lots of good info on the bike they know it better than kawasaki does !

i had a 2000 that did the same thing after it sat all winter . mine was a bad petcock

You have at least two problems if not three. First off, a float valve sticking open will allow fuel to overflow the float bowl. Float bowls have a drain tube that will allow the excess fuel to drain onto the ground. Since the gas ran into your crankcase, that means that both the float valve stuck and the drain hose must be blocked or kinked. If ti wasn't you'd have found (and smelled) gas running onto the ground under the bike.

If the gas drained only while the engine was running is one thing, but if it did so while the engine was turned off, that means there may be another problem. I'm not sure what kind of fuel petcock your bike has, but if it is vacuum operated and the gas drained while the engine was shut off, the petcock has problems as well. If you look behind the petcock and see two hoses, one large and one small, it's vacuum operated and is supposed to shut off when the engine is turned off. If there's only one large hose, then it's a manually operated petcock.

You say you idled it for a few minutes, just how many minutes is a few? Also, how much fuel did you have in the tank to start with? Did you check the crankcase oil before you started the bike? I'm asking whether or not any of the gas leaked down while the bike was parked or if it all happened while running. If while running, did the bike run ok otherwise or did it miss and run rough? The answer will determine whether or not the gas leaked down into the cylinder(s), past the rings and into the crankcase or if it's getting into the crankcase through another route.

If the gas drained only while the engine was running is one thing, but if it did so while the engine was turned off, that means there may be another problem. I'm not sure what kind of fuel petcock your bike has, but if it is vacuum operated and the gas drained while the engine was shut off, the petcock has problems as well. If you look behind the petcock and see two hoses

No more please click the link

Yes it one of two things, the fuel petcock leaked by(spring pressure to weak or a hole in diaphragm) and also dirt in one of your float needle seat.

find parts diagrams here.

http://oemparts.buymotorcycleparts.com/dillonbroth...

http://www.bikebandit.com/houseofmotorcycles/2002-...