The Zephyr Zone

So I have a zr550 fuel tank with the two extra ports on the bottom in conjunction with the overflow tube port for a total of three. Am I correct in assuming that these for the California models that had the extra emission equipment, or are these more common outside of the US? I have three 550 tanks and only only this one has the three ports. I have decided to sell this one, but I wanted to know more about these extra ports so I can more accurately describe it for the sale.

I would be thankful for any information or insight!

I am betting that is CA only and an emission thing. I ran across the same thing with the ZX550 Tank, and haven't seen another as mine had additional underside nipples for this stuff. One went to the charcoal cannister, and the other went to the airbox. If you don't have a copy of the ZR550 Kawasaki Factory Service Manual, I'd keep an eye out for the last edition on ebay. Part Number on the back cover 99924-1136-03.

Here are some pictures inside that might help you:

Exactly Corey! The diagram in my FSM is what made me positive it was for the California emissions equipment.
But I bought it from a guy in Canada, so I did't know if our neighbors to the north also used equipment such as charcoal canisters as well.
Frankly put, the zr550 tanks are getting really really rare here in the states and the emission equipped tanks have to be even harder to find.