Sorry! The HSN (high speed needle) is the black screw with the gold body that sits on top of the carb. the LSN (low speed needle) is the one on the side of the carb on the throttle arm (this is assuming you have a Hyper 8 port). My needle settings will differ from yours because of the difference in temps. There is no one perfect setting that works for all. As a rule of thumb, lean the HSN until you get good rpm's and the buggy reaches a good top speed with a trail of smoke coming out of the pipe. Once thats done, go to the LSN and lean it (1/8 turns) until the buggy accelerates nicely.

A good way to check if you're in the neighborhood on the LSN is to use the pinch test. With the buggy warmed up, pinch the fuel tubing just above where it attaches to the carb and hold it until the engine dies. If the engine gains a few thousand rpm's before it dies, you're too rich. If the engine just dies, you're too lean. What you're aiming for here is a little gain in rpms (roughly a few hundred) and then the engine will die. Once you're there, you're reasonably well tuned.