Are these the right Weber jets to fit the ZX9 E1 carbs?
http://www.fastroadcars.co.uk/shop/index.php?act=viewProd&productId=28
Look how cheap!

Look a lot like these
http://www.wemoto.com/bikes/Kawasaki/ZX9R_ZX_900_E1_E2/00-01/picture/Carburettor_-_Main_Jet/

There was a company on Ebay selling jets for Kawasaki carbs. I bought a set of 4 for my ZX6r carbs which I assume are very similar to the ZX9`s. Cost less than £10 incl postage too.
Just checked my old Ebay purchases and I got the jets from a company called MPW, Beaconsfield Rd, Brighton, East Sussex. I think their user name is m-p-w. Search for "Mikuni Slot head jet" and they sell all sizes. The jets were only 99p each, the rest was postage.
Hope that helps,
Nick

had to search under "Keihin jets" and the best price is £2.49.
Cheers

I got some from Kawasaki Newcastle a few years ago.

Why not ry the dealer?

Went to a local dealer who offered me oem quality parts for £6 each and said that original parts would be even more!

Try The Carburetter (sic) Exchange, http://www.carbex.demon.co.uk/ and ask for DGAV/DGAS jets. I have found them very good in the past.