ok. then the most probable reason of jerking n ignition turn-off must be due to any of these- air filter/ spark plug/ carburetor. so it is better u get ur bike serviced since u say it is to b done in the next 15 days. n specify about the 3 parts i mentioned to b checked n cleaned thoroughly to ur mech.

And any idea about the oil like deposit, i have posted it earlier.

till then u make sure of wat problems ur bike is causing. do this exercise n probably u urself might get to know the issue..
1) Park ur bike on the main/center stand.
2) Start ur bike (n preferably have another person to help u out) and run the bike starting from the first gear.
3) As it is running check the nature of the chain in between the 2 sprocket(front & Rear) i.e., if the chain is having a sinusoidal(wavy) kind of motion. This is ur first hint to show that it is something with ur chain.
Note: do not concentrate much on the sound in the above step.
4) Now, since u tell that the sound is from the engine side of the bike.
Ask ur friend or companion to shift gears as u check at lower side of the chain. u may find that the wavy nature of the chain will be in contact with some other part of ur bike. this is caused because when u accelerate n de-accelerate, there is a kind of jerk in the chain movement. n due to this the chain may hit the chain sprockets or any other substance coming in the path of the wavy chain moment when u throttle or release it.

i have had the same issue, n got my chain kit replaced. now its fine n no more noise. so check it thoroughly. if u were not able to still find out then u might have to get ur bike checked thoroughly from a good n trustworthy mech..

Then it could be the TPS too,

@prateek2210 and abhirairtr..I am sorry for the misunderstanding guys but i hope i typed it 15000kms. My bike has clocked a little more than 15k kms to be precise.

TPS is not the culprit here, but still if you want to replace it, no harm in it. Who don't love a new thing in bike

Are you still facing it after filling up the petrol?
As abhirai said check those things first, TPS would come later on

No i am not, only the lag between 3k-4k RPM.
I had got the jet and carb cleaned if u remember

Went to the service center today. Told them that I'll change the oil from outside. They told me that if you change the oil from outside, you won't get engine warranty after that. Is that true or just some BS?

Then change the TPS
BTW why you just top up by 100-150ml? Do you not drain the entire oil and refill it with new oil?

Changed to my 3rd rear tyre...R-15 rear (100-80/17).....now both my tyres run R-15 tyres....the best combo for grip as well a power.

bro, how much is the cost of r15 v1 rear tyre? how good is it? any prob with dat tyre being in apache?