I have just started the R4 after a month of sitting and the Throttle or Choke seems to be sticking open. The cable movement of both seems OK so I guess it is something in the carb? Any ideas where to start looking?
there should be a coil-spring mounted on the carbhousing to assist pulling it back.If you have some other pulling the choke-lever
from with-in you will easily see how it operates and moves and you be able to mount a spring for the return
(Same goes for acc.cable where the return-spring easily can jump off at one end)