hello..
did you use compressed air to clean out the carb after soakin it.to clear all the passages out and blow out all the jets?and could you see day light through all the jets ?there is one jet in the carb that has multiple holes in on the barrel of the jet those get gummed up so bad you have to 1 replace it or get cuttin torch cleaner kit and clean um out.
did you bye a aftermarket rebuild kit for this.it should have come with new jets,float needle.bowl gasket.oring and washer for the air flow mix screw,new screw and spring (for the air fuel mix)and a new pilot needle and a couple other little orings.
or did you just take it all down soak em and clean em up?cause if so im goin to test your memory here.while the air fuel mix screw was out did notice a sharp point at the end of it?iv seen them break off in the passage and get stuck from over tightin it,or age ,so you can adjust that screw all you want and its not goin to do nothin to the air fuel mix.that 7.5 turns out when you first took it apart sounds fishy no bike should run with it out that far
also do you have the air filter hooked up and the box closed up?
and have you change the spark plug with a fresh ngk yet?
thems there sum ideas hope they may help you figure out whatsa goin on with you machine.-corey-