Which jet kit did you buy? There is literally tons of info on the forums about modifying the BST carburetor. Just like the oil, tire and ECU flashing threads here. DRriders, ADV rider, Youtube, Motolab are all good sources of info. There are lots of different ideas out there. My suggestions would be to check the float height, not shortening the spring, not drilling the slide, and not grinding the needle. Also, be aware if you bought a Dynojet kit, the jet size numbers are different than the Mikuni sizes. A 155 DJ jet is not the same size as a Mikuni 155. Have fun and keep those instructions handy!