Cars Q&A

Dear Sir, I'm owning Yamaha Libero Model of the yr 2002-2003. When I took it second handed, in the yr 2005. The running was 16100 Kms as on and average was approx. 45-50. Then I changed it's Spro Kit and timing chain immediately. Since ever I have been doing servicing regularly and using only Yamaha's 4T oil, changing after every 2000-2500 Kms. My problem is : When I changed it's spro kit that bike started giving me an average of approx. 115-126 kms per lit. Almost I enjoyed this session more than a year with taking care of every maintainance. But for last three years my bike's average is getting down. Now I hardly get an average of 65-70 per lit. My fitter is one of the well-known fitter of Yamaha Show room. Being an Engineer with Diploma degree, he has very keen knowledge of Yamaha's each and every bike with almost every faults and problems. But still he failed to find the fault of my bike as why the average is getting down. Hence I would like to request u kindly to guide me properly so that I can again get good average nearing 100 km per your. awaiting your respond in affirmation. Thanks and regards, yours truely, jitendra