This what I decided to do with my gst 7.7 high pitch problem.....
before i fool around with engine at all, i decided to seal the carb. Now, i need a confirmation here. I took the screw offon the sideof the carb (dont know the purpose of it) I detached the throttlehandle off the carb. I used a plier and gently wiggled the carb til eventually i was able to pop it right out.It was really hardpulling it out at first.I sealed it using permatex and i put it back in. It didnt seem strong in place i was ableto spin it by hand with a little force. is that normal? did i do it right? i put the screw back on, it really didnt too much of a difference.
second, i replaced the fuel tank with my hpi 5.9xl tank. figured less volume maybe the pressure will be greater. I will run it this weekend then i will post the results.

Please i need confirmation on the carb. the carb had no o rings just a plastic sleeve going into the neck.