Yamaha R15 V 2.0 self not working even after so many fixes

My bikes odometer reads 20261km...
I was facing a problem that the self goes completely dead sometimes say(10/100)...
I went to Yamaha service station and the mechanic advised me to go for a starting relay change after the starting relay was changed the problem still persisted.....so they told the battery was discharged they charged it for 3 hours and checked but the problem still existed after that I was told that the valve might be at fault .....
I in a perplexed state of mind
Advice me something to get out of this issue

Hi Abhishek,

The way you have described simply means that sometimes starter is not able to draw sufficient power which it needs. Since they have changed relay, it could be bad battery also. Have you tried checking battery with multi-meter, or simply try to swap it with a new battery / test battery and see if it solves the problem.

If that doesn't solve issue then you may have to get self-starter checked, may be it is drawing more power than usual and hence the issue.