Thanks for the info.
I'm guessing that the 23 HP Vanguard in my 2072 doesn't have the restrictions since the 21 HP shares the 627 cc displacement.
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Travis
1993 Cub Cadet 2064
1988 Cub Cadet 2072
1980 IH Cub Cadet 782 w/CH20
1966 IH Cub Cadet 102 w/K301
1961 IH Cub Cadet O
1967 IH Cub Cadet 102 & 122
JD 2155 w/ 175 loader