Hi All

I'm riding a 2009 Yamaha FZ-S which is bought in second hand. Its odo is 18000 kms. The engine is good and I ran 2000 kms.

But while changing gears and accelerating I'm getting beating sound. I need a refined sound like the one coming from Honda (Unicorn/Shine).
Will it be possible in FZ's??

The performance is getting reduced when riding with a pillion rider. The change is noticable. Is it common in all FZ's??
My tyre pressure is 30psi front and 35psi rear. Stock tyres (rear is new one).

Also please let me know how long can I ride the bike legally without name change (RC, Insurance).

Thanks in advance