I haven't noticed that my Timberwolf swapped DX is any less powerful than other DX225's. I do have a DG exhaust and have played with the jetting a bit. Mine is geared lower because I used the Timberwolf rear end and I'm running 20 inch tires on the back but it was still fast enough to take 1st in 2015 and 2nd in 2016 in the utility class. I've thought about building a modded out DX with all of the same mods (cam, high compression piston, larger carb) but the one thing I think holding me back is the limited gearing options. There is a guy on the ytm Facebook page that has used the dx differential with the timberwolf swingarm but you are still left with gearing set up for 22 inch tires. So you will lose top speed if you go any smaller with your tires.
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