i dont understand you ... what you mean  si hui on gear 1 or 2....  that means you enter gear 1 or 2  while not moving and the bike engine will die off ?

your clutch plate is gone !  please go to the shop and tune the clutch... if it is on miximum (that means cannot be tune.. you have to change the clutch plates) The machanic will know how to do it... just for your information ,there is a thinny screw beside your crank shaft on the right hand side. Do  not adjuct yourself... need a machanic to do it.

Please ask the machanic to check the auto-clutch for you also....

Summary: Ask machanic to  check--> clutch plate ( tune or change new one )  and Check auto-clutch.

that why i m asking you ... when your bike is not moving.. then when you enter 1st gear .. it will die off ?

if not.. it is not the clutch plate.  Need more information .. more details like...  before this you dint touch your engine setting ( carburator, etc )

what is the situation ? cold start ?

ok friend... what i can tell you here ... IF your motor is in good condition since you said that he tune your engine smooth already... i can assure you that it is comfirm is the clutch plate. Go get it tune. If cannot tune , then it because it is maximum already.. you need to change it.. NO DOUBT.

It is around RM 8 per piece. You need 4 pieces. so around RM 36 and work manship around RM 20 ( i guess)

The needle is original one or a new one ? He change the whole needle or just change the position of the pin ?
my advice dont change the needle.. stick to factory setting. the needle pin should be in the middle... based on your story.. cold start easy.. because he had set the pin up one level.

if you change the clutch plate.. please ask the machanic to check the auto-clutch also.. 80% will wear off also ! 100% comfirm !