You can buy a new cable and a plunger on ebay for a 250 timberwolf. The plunger is the same part as the dx. The cable is maybe a little longer? I don't remember exactly but it works on my dx.
Or you could search "mikuni choke" on ebay and will find the choke knobs for them for $7 and up. I'm not sure of the differences so that will be up to you
1979 ATC110
1983 ATC110
1984 ATC110
1984 ATC125M
1985 ATC110 2 of them
1985 ATC110 The wife's
1987 ATC125M
1985 ATC250ES
1984 DX225 with 250 timberwolf engine and swingarm. Wolf in DX clothing