Stu, 2T has been tuning and building 2T motors for longer than you've been around. And to be honest most of your post's seem based on what you've heard second hand not your actual experience. I mean how many times have you jetted a 2T how many plug chops have you even done? You just took a whole paragraph to tell someone that they can't just wake up one morning and change there mixture from 25/1 too 32/1 without rejetting. Of course you can, Change back and forth as much as you like it'll make no real world difference, unless like 2T says your bike's jetted just shy of seizing. He's just calling you on some of the statements you post up on here like you know and you've done it hundred times before. Nothing beats experience.