it should ork w/o trouble... have seen people put broader tires in Junoon... That are of CG125.. But the rim size should be same. Tire pressure should be kept same or a little higher...
The bike wont remain nimble in handling, but tire shudnt do any trouble as in case of cars.
jumping to a very broader tire might not fit in the same rim, but jumping one size i.e. 0.25 should work w/o changing the rim.
Asked it from Honda authorised mechanic once... he said its possible.
Any tire wala should be consulted before the experiment. havent done maslf.. its just my logical guess.