It's expensive, and I've found you can get pretty good results with the stock jets and needle, but simply shim it correctly. The kit is expensive, but the last Kz550 I jetted came out very nicely with just shim on the needles. It had pods and a Mac 4-into-1 exhaust.
Here's how you properly shim the Tk22 carbs:
gpzweb.s3-website-us-east-1.amazonaws.co...shimmingNeedles.html
The 2305 kit can be around 100 pounds (over $100). Shimming will only cost a couple pounds ($3 ?).
Also, watch out for counterfeit Dynojet kits from China.
