Turbobike Web Site www.Turborick.com
All, Took my CBR600 turbo for it's first ride this weekend. It's suffering from 2 carb related probs. I have a baaad lean spot around 6-8000 rpm, off the guage on my 02 sensor. If I can get it to cough through that (scary) it pulls hard and runs OK, but I get a wicked backfire between shifts (chase vehicle reported 3 foot exhaust flames before I buzzed out of sight). I've been moving my stock needles richer each time and am getting some improvement in running, but am always full lean at 7-8000. It makes 6-7 lbs of boost here and 10lbs above 8000. Originally, the slides were opening too fast and flooding the motor at about 3000, so we plugged 1 of 2 holes in the slides at the suggestion of the mechanic where we were dynoing. I think this is my backfire problem, they are slow to open and therefore slow to close. So I will be removing the plug and going to stiffer springs like y'all suggested. Where do I get stiffer springs, and how is the stiffness rated???? I'm planning to shim them tonight to see if I can get rid of the backfire at least. Feedback? I'm thinking I need a different taper needle to fix the lean spot, but how are the tapers measured? I made a see through cover on my airbox, so I know approximately where the slides are at this rpm under no load. thanks, Dave.