1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 49Get this manual
Icl 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 V4 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 obtained Throttle Valve Synchronization
INote With
the engine idling in NEUTRAL, if loosening the carburetor lever adjustment screws results in better idle, improper synchronization of the throttle valves is indicated At idle, the throttle valves in all carburetors must be completely closed If the carburetor linkage is misadjusted so one carburetor throttle plate is slightly open, it will result in poor quality idle1sl 1Turn throttle handle to idle positionLoosen the throttle E.J cam follower screwPush the throttle cam follower away from the throttle camThe throttle cam follower must not touch the throttle cam