Re: 1983 ATC 185 clutch
I got a 1983 185s myself (has a auto clutch, but has the same manual I assume you have a standard clutch since the auto has no real adjustment). you loosen the locknut then turn the adjuster screw untill you you feel slight resistance, then stop. after this you turn the screw back out 1/8 turn and tighten the locknut as you hold the screw in this position. the manual says to ride and readjust if needed, honestly if you have trouble and can't get a good clutch after a few tries i would look into the plates for wear.
good luck, hope this works for you,