Yes there is an adjusting screw, however it would not change on it's own.
The outer cable sheath may have slipped out of adjustment or the governor
spring may be unhooked or broken.
wrote in message
oups.com...
I have a 11hp B&S motor on a John Deere 111, my question is that I
barely touch the throttle and the motor revs very, very high. Is there
a screw adjustment on the carb to adjust top end throttle?

Thanks
Chad