so today im ready to go out and i ran out of gas good thing i gor reserve but anyways fill her up and i was riding good the iddle was stedy then me and a friend took to the high way and she was good comming back home at a light my bike was in neutral and i could hear the bike rev up and down up and down. down to 1000rpm up to almost 1500rpm it wasent stedy anymore but when i start going she hesitates but then she is fine i can ride like theres no problem i replace sparck plugs like a month ago and just got a new battery. idk what could it b sometimes it feels like is going to die on me.
i need help to see if is the iddle screw that i have to turn or i need someting else? thank you guys any help will b apreciated.

 

Theres an idle screw on the left side of the bike that you can turn to adjust idle up or down, but if your idle is flucuating, it probably wont help. My bike does it sometimes too (except not as severely). It could be related to the carbs, but I'm not sure exactly.