High Performance Super BN44/40 - Mikuni no. BN44-40- 8052. 44mm carb comes with extended throttle shaft to make dual kits. Designed to give maximum performance with a single carb. Features a viton 2.3 needle valve, no. 100 pilot (slow) jet, no. 125 main (high) jet, primer type cold starter (no butterfly choke), and angled fuel fittings. High Performance Super BN46/42 - Mikuni no. BN46-42- 8002. Something extra for the pro rider, this 46mm carb has same bolt pattern as BN44mm. Features a viton 2.5 needle valve, no. 120 pilot (slow) jet, no. 150 main (high) jet. Comes with extended throttle shaft, angled fuel fittings without choke.