As you can read, they wrote 6000 is max with High Quality fuel and asked to adjust according to our own fuel quality or get recommendation from Yamaha Pakistan. I agree that 2000-2500 KM range is optimal.
What I have been conveying to my friends is that either you use oil priced as 350-400 rupees and change it after 1000 KM or buy Liqui Moly at 750-900 rupees and go for 2500 KM. Here the equation is balanced but with cheap oil you are paying extra on maintenance and engine wear and tear. In long run, if you see Liqui Moly is saving something for you instead of costing extra.