200S and 185S have 22" tires with 8" wheels. ATC185, 200M, 200E, 200ES and ATC200 all have 25" tires with 9" wheels. 200E, 200ES, and 200M have electric start. 200ES has hi, lo, is the only one with reverse. 200E has hi and lo range. ATC185, 1981-1982 ATC185s, 1981-1982 ATC200 have no suspension. All 200E, 200ES, 200S and 200M, 1983 ATC200 and 1983 ATC185S have front suspension.
Those are just some of the differences.
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