hey my jetting is messed up pretty bad, does anyone know the stock turns out of the fuel mixture screw. and where should i put it with the air flow mods in my sig (complete pipe, intake filter, and NO airbox lid). thanks. also how do i know when the fue mixture screw is turned all the way in, when i turned mine in all the way to check how many screws out i was, instead of just stoping, the screw just got tighter and tighter????. maybe im not screwing the right one in. its been a while since i jetted it. is it the screw on the bottom of the carb? thanks

 

i can only give you suggestions. i would try around a 130 mainjet and 3 turns out from lightly seated on the fuel screw. the fuel screw is the bronze colored screw near the very bottom of the carb. you will turn it with a small flat blade screwdriver.

 

Gotta be careful screwing in the mixture screw. Its brass and will easily deform from bottoming out. Just screw it in lightly, and when you feels resistance, thats the bottom, dont keep turning. Youll need to completely unscrew the mixture screw and look at the needle end,and if its deformed, itll need replaceing.
The screw is number 6 in the picture.
carb 300ex
Heres a site , that might help, with the adjustments and jetting symptoms.
jetting