Hero Motocorp — Two wheeler technicical problem last 6 month go still not find .

Address:	Chennai, Tamil Nadu, 600002
Website:	Hero moto crop

I am use hero Honda CD deluxe last 5 years in Chennai. India. I am single owner me main problem is me vachile technical problems last 6 months going still not identify what is the problem in my hero Honda CD deluxe machine. U r company authorized showroom work shop technicians many time slove this problem many spare change but stil bike problem not slove .
Bike problem is vachile running time speed above 40 some missing .just like petrol reserve come time running time missing come like all time come .above 40 speed go vachile running very difficult not to fast move speed down slowly. It very difficult to me in bypass road .
Technicians many time many work to slove this problem . pwer come CD+plug.+engin head clean + head valve change+ battery change + coill +all change but still main problem missing not slove this all work do I have lost many days + 10000 still I am experience come .me work is marketing so I have two wheel must .
I am going to local workshops to slove this problem but they same spare change but stil not slove.
I am request is please tell u Senior technical man contact details in chennai give or return take this bike company me lot of headache I am suffering.