Its not really suiting my ts1 200

trouble is my expectations have changed since I,ve been running my Avanti.
I think in all honesty the bike is over geared 4.8 on an indian gp200 I can rag it to 70 in third change to fourth and dies.
I was running it on a pacemaker, I think with 16/46 but that was a bit revvy.
any one got a picture of a circa 1988 fresco ( the pipe the bike was originally supplied with).