So since my rebuild I haven't had a ton of time to ride but basically the Z is 68.5 bore Team Yamaha ported jug and the head has been milled 1mm. Air box is wide open, stock 32vm and I've tried tons of jets and the flutters no matter what main jet is in it. Right now it's a drilled jet but it's the only jet that makes the plug run a nice chocolate color, anything less and the plug runs lean.
I've checked for vacuum leaks & can't find any, it idles great runs good mid range but as soon as the throttle goes wide open it'll run good for a second or two then goes into the flutter until you lift the throttle. It did not do this pre rebuild, pre porting, pre reeds. Somebody throw me a bone here because I'm losing patience with this junk. Thanks