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On the gsxr the needles are to fat at the end and they become the main jet so you need a needle that is thinner at the end. you might try that on your ZX9 Turbo Rick Web page 300HP Turbo GSXR1100 Street bike And Performance Bikes, Technical info, Pictures, Land speed Racing, Turbobike Mailing List, Links Page, Chat Room Web Site http://www.ptw.com/~gsxr1100 E-mail gsxr1100@ptw.com >Rick, >We have checked the plugs and they looked jus a little light. >I dont have an Air-fuel meter but thats gonna be the next step. >We have tried jetting anywhere from 230 main to 190 main with absolutley no >effect on the power curve or on the horsepower curve. >The next thing my tuner wants to try is cutting out some of the intake >manifold and putting plexiglass in it (sealed up really good of course)so that >he can watch what the slides are doing. >thanx >Glenn >