I am not at all familiar with that machine, but: first,
if you don't have the service manual, you should get one.
I think you can download one free at
https://www.manualslib.com/manual/1067827/Bajaj-Ct-100.html
If you bought the bike new, the manual should come with one.
If you bought it from an individual, he or she may have it.
I have not had any problem with the free manuals I have