Guy Young said he gets requests for pictures of the routing of the California emissions bikes enough to want some pictures. Well, here they are. There is no explanation of how it all works here. Maybe I'll put something up later. If you understand 1980's automotive emissions systems, it's pretty much the same functions.
I've color coded the hoses by the ones shown in the Kawasaki shop manual. Your hoses won't look like this unless you do it. Maybe multicolored electrical tape or zip ties would be just the farkle for your next tech session :)
The tank fittings. Red is Fuel Return Hose and comes from the Vapor Separator. Black is the Water Drain Hose from the gas cap. “Sonic Blue” is the tank's Breather Hose.
Below shows the rat's nest of hose's. Same colors as before, but now we add a couple. Green is the Vapor Canister, aka charcoal canister, Purge Hose. Light Blue is the “Breather Hose” that comes from the fuel tank via the “Vapor Separator”. Yellow for the fuel bowl's “Breather Hose”.
See the uncolored hose towards the bottom? That's the coolant overflow hose. It should dump BEHIND the rear wheel. Just a no-extra-charge safety tip.
Another view of the whole mess from the side.
It's really busy around here. The clear battery vent hose does dump in front of the tire (there's a bracket behind the separator). If it's not open to vent, you're battery won't charge properly. The ground wires are beside the hose. Otherwise, it's all the same stuff.
Here's the Liquid/Vapor Separator. White is the Vacuum Hose that operates the separator. I believe it functions like the canister purge valves in automotive applications. Note the battery vent hose in the background.
Last bits. The White, Vacuum Hose goes up between intake ducts 3 & 4 and attaches to a nipple on the manifold side of the #3 carb. The Yellow, fuel bowl Breather Hose goes up between intake ducts 2 & 3, tees and goes to the vent fittings between carbs 1 & 2 and 3 & 4.
Here's where the fuel bowl Breather Hose goes on the left side, between carbs 1 & 2.