3-4 months k baad oil change? :S Do you even drive your vehicles?
I mean, it takes me like 2-3 (busy) weeks, after that I have to change the bike oil.
Also, CG125 walai advices idar na den, please. Like "tunning should be done twice a year". If it was 'tappet adjustment', to baat samjh main aati hay, but 'Tunning' twice a year ... bike ko barbaad karnay wali baat hay.