Hi Muzz
This is fitted to a US version which has a Carb not FI
The FI vesion in Thai / Europe is more difficult - it will take the same kit, but making sure it has enough fuel is a challenge.
A 300CC kit is available from Kawasaki (or atleast the parts seperately for a kit)
Custom Craft does the 330 kit
Bill Blue does a 351 kit
If you search the net there is only two people who have posted about fitting a BB kit on a FI bike - where as there's hundreds for the Carb bike.
I think that if you have fitted the Performance ECU from Keihin then that MAY give enough fuel for the 300 kit
- but not sure for the other size kits which need more fuel -
You can also add a juice box to give more fuel and that combined with the Performance ECU MAY help - but its a risk as its not very proven.
Kits are between 500 Dollars and 750 Dollars in USA - the 300 kit from Kawasaki is probably cheaper in Thailand.
FYI Kawasaki Part Numbers you need for the 300 Kit are
11005-1983 Cylinder
13002-1109 Piston Pin
13008-1071 Piston Ring Set
92033-1054 Snap Rings - 2 off Required
11004-1314 Head Gasket
11060-1740 Base Gasket
13001-1463 Piston
As I said - these kits have been fitted to lots of USA carb bikes which have the same engine, just Carbs not FI
Have a look here - good fitting guide.
http://kawasakiforums.com/forum/showthread.php?t=4781
Hope this helps??