Turbobike Web Site www.Turborick.com
Stuart, If it's any help to you. I have the standard BST40SS carbs on my 1992 UK spec GSX-R11 and through experimentation I found the float needle valves would hold 5psi without the engine running, but with the engine running 4psi was about maximum before the carbs would flood. I now operate my bike with the fuel pressure set to 3psi over boost, and the float hights are set at 15mm which is about standard. These settings work just fine for me and I don't ever have any flooding problems. Just a couple of things I'd recommend: Return the fuel to the top of the tank and make sure there are no restrictions in this pipe. I use a 5/16" stand pipe in the tank with a wide radius 90deg bend. When you adjust your regulator do it at your desired maximum boost pressure. (I found my regulator could be somewhat non liner at the low end!) What I did was plug the pipe to one pair of carbs and connect a pressure gauge in place of the second pair. I supplied the regulator with compressed air at 20psi and then adjusted the fuel pressure for 23psi. This will guarantee you always have 3psi over boost when it really counts..!! Good luck Regards Tim Drew -- Phone: +44(0)7050 611846 FAX: +44(0)8700 881993 ICQ: 52312721 E-mail: tim@timdrew.co.uk