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The cable ends are the same 1986 or 1992.
Thread the cable ends onto the control box end 8mm. The engine side is then adjusted to fit the throttle.
You really need a tach to determine the idle speed and wide open throttle speed. Without seeing the engine I can't see how close the adjustment is.
Keep in mind the engine will run faster at idle out of the water on the flushing devise.
Remove the throttle cable from the engine, push the throttle linkage against the stop. Now either by hand or the control shift into gear. See if you get the same amount of grinding. If it does it in the water then the problem is in the lower unit. The shifter may be worn.
Let me know how it does.Any additional questions let me know.
Post back your outcome. Thanks
Thank you Ted.