bajaj bikes

I says that now in bajaj the manufacturing of materials is weak,but the design of bike shows very great, the mileage is high due to low weight of vehicle and not have steady comfort and high safety.. i have 1989 kawasaki kb100, i maintain that bike like my lover, the reason is now it is nearly 21 years old, but now it shows like a new bike.. i used that bike very roughly, but it can run very casually …. nearly it runs up to 6,00,000 kms now it still running good i can maintain and change oil correctly that the reason it can run like a good condition… this bike can design with high quality of materials ,,, but now delivery of new bike is not like this…thus the new bike cannot withstand while using roughly… i said that one thing now onwards my bike give mileage nearly 50-55, in highways it gives 58-60,i didn’t change any spares in engine…. all running in standared parts…..