lol if you dont know how to tune a engine what are you doing in this hobby? have you even tried looking in the manual? or maybe even the internet? not trying to be mean but when someone with 1 post comes asking how to tune a engine makes me want to think you are just a cheater and wants to find the easy way through. but anyways i can give u a few things
the tall needle on the carb is the HSN(high speed needle)
the needle on the side of the carb is LSN (low speed needle)
the tny tiny screw is the idle screw
if you bought it brand new then you have to break it in first. unless you want your engine to go out in a few gallons.