Standard rings 4 cycle Honda 1981-85 ATC200 E,X,M, TRX , 1981-86 ATC200S 10.25:1 compression,ATC185, +.080 overbore cylinder boring only 10.25:1 compression, 1981-85 ATC200 E,X,M , 1981-85 TRX, 1981-86 ATC200S 12:1 compression, 1986-88 ATC200X TRX200SX, 1986-87 Fat Cat 10.25:1 compression,1986-88 ATC200X, TRX200SX, 1986-87 Fat CAt 12:1 compression, 1990-97 TRX200, D 8.4:1 compression,








