i have honda cg 125 cc bike model 1995 in pakistan . it has 4 gears and max 120 km/h it is not running good it only touches 110 . in full rpm it breaks his breath and his head make some noise . then i changed his valves then it leaves this prob but still not running fast what i do . about 2 years before it crosses the 120/km but now not what and his silencer is not white from inner thats dry i also changed the piston its on 0 i mean standerd and not lose in cylender ...... or plz can u tell me any alteration 4 honga 125 cc 4 gear cdi thanx