low idle 1980 rx7
 

ive been trying to find the fast idle screw for two days. i heard it was right of the fuel mixture screw . i cannot find it. is it on the carb or on the linkage like it usually is. ive used a mirror trying to locate it dont really want to take it off to make a 1/4 turn , any help would be appreciated idling around 650 rpms need to get it to 750