1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 68Get this manual
positionsCheck the clearance between the roller and end of the cam slotThe roller should be approximately 1 in(6 mm) away from both ends of slot
r;;J Turn the twist grip to full open and to full closed
5If adjustment is necessary, loosen jam nut and rotate thumb wheel to obtain correct adjustmentTighten jam nut after correct adjustment is obtainedThrottle Valve Synchronization With the engine idling in NEUTRAL, if loosening the carburetor lever adjustment screws results in better idle, improper synchronization of the throttle valves is indicatedAt idle, the throttle valves in all carburetors must be completely closedIf the carburetor linkage is misadjusted so one carburetor throttle plate is slightly open, it will result in poor quality idle