[Resolved]  TVS Apache RTR 160 — Handle vibrations

I am a owner of tvs apache rtr160 with tank scoops varient.. i bought it on 15/04/08 from Sneha tvs showroom in Hyderabad, the problem is that the handle vibrates severely between rpm range 4000 to 6000 . i regularly gave my bike for servicing . the service center mechanics tell that the bike is in good condition to escape from complaints .they just tighten the bolts. i made them to make through survey and they made fork realignment and tighten engine mount nuts. but the still problem existed .. After few days tvs free service camp was arranged. Then i gave my bike for checkup then also they have not solved the problem ... And thanks to them it has become worse now bike handle vibrates between rpm range 3000 to 7000... please advice to solve this problem or else should i go for claiming warranty...