Help : Engine Jerk & Mati Engine & Finally Battery Kong

Hi All, am new to be forum but am quite long with the gts200 (caburator) the bike now is 50000KM and was the only owner.
To cut short i will summary here on my problem and i really hope i can get the right answer from all otai kat forum :

Day 1-3 = Feel some jerk around 7.5 - 8K rpm (some sort like engine tak gerak or cut off for split second) - p/s no problem on starting the engine
Day 3-5 = Jerk come at 6.5-7K rpm range - p/s no problem on starting the engine
Day 6 = Changed Air filter, Spark plug , and service caburator. Jerk come everywhere after the service and it jerk until the engine stalled(1st time mati engine)
Day 7 = Sent back to another shop for checking this time. Buka caburator, and service CVT sekali. (reach home engine mati thanks god only 1km away!!!try to start for like few minutes approximately 20times? and realized the battery suddenly dead, where the dashboard got no more like appear and meter reading. So i buka battery go to shop near by to test the battery power by car ofcz and the battery is not chargable.)
Day 8 = which is today, i will going to replace the battery today hoping that is the culprit.

Question :
1) anyone can advise what happen based on your experience because spending school fee like this and did not get problem solve is miserable!!!
2) If battery is weak? will that result on the jerking? maybe cz CVT required the battery to work? cause i am worried after the battery was installed there is other problem and resulted in battery flat off again
3) please advise the possilble cost to incurred on the suggested root cause.

In case if i break any rule in the forum i will like to apologize cause i have been trying here and there to get the right answer instead of reading the rule hoping my bike problem solved immediately.

Thank you in advance

Good evening Mr.Stevenchua..u just break d rule..hehe..rule no.1 is to introduce urself first..just like u visit ur new friends house..in malay we say give salam..then only u story what ever ur bike problem..no worry..lots of sym otai here can help u..cheerssss..

did u smell any thing burnt? sounds like some rectifier-related case.
this bike is prone to have such problem - even when new!

thanks for the reply, rectifier OK cleared cause battery able to recharge
Changed the cable for the spark plug, so far it work fine after a couple of test.
Hope everything work well

stevenchua wrote:

thanks for the reply, rectifier OK cleared cause battery able to recharge
Changed the cable for the spark plug, so far it work fine after a couple of test.
Hope everything work well

So we may conclude that your scoot problem it is due to ignition coil

update us on the result from time to time k... thanks for sharing