I suppose the answer is no. ut if you were willing to, you could sacrifice some top end for wheelie power. and 50-60 is plenty of speed. But how fast it goes is never enough.
A spur with more teeth and/or a clutch bell/pinion gear with less teeth. I had a 70 tooth spur and a 20 tooth bell and went to a 72 spur and 18 bell. WAAAAAYYYYYY more acceleration and power. A little less top speed though.
The issue could lie in the tuning if your gear ration is pretty close to the norm, but 50 to 60 is a very high mph for that engine I would think, but I'm no guru