[Resolved]  Hero Honda — about piston kit

hello sir/mam
i have purchase a cbz star model in 2004 and after 6 months the bike gives me a problem of pistan kit under warranty my piston kit is changed but after 6 months the piston kit again gives me problem of piston kit and again i spend money from my pocket and change the piston kit.now from 2004 to 2008 i have changed the piston kit 6 times but now there is again and again gives me a problem.ny nechanic says there is a any manufacturing problem in this. then i am call to delhi hero honda office and they gives me a no, of chandigarh head office.they are saying to me we cant do anything in your case.can you tell me sir what can i do.
thank you