1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 53Get this manual
r;'] 4Turn the twist grip to full open and to full closed positionsCheck the clearance between the roller and
end of the cam slotThe roller should be approximately 1f4 in(6 mm) away from both ends of slot5If adjustment is necessary, loosen jam nut and rotate thumb wheel to obtain correct adjustmentTighten jam nut after correct adjustment is obtainedThrottle Valve Synchronization
f81 1Turn throttle handle to idle positionLoosen the throttle cam follower screwPush the throttle cam follower away from the throttle camThe throttle cam follower must not touch the throttle cam