I am using yamaha r15 v3. I got my bike today from the service centre

I am using yamaha r15 v3. I got my bike today from the service centre after paying a huge amount of 23k for crankshaft problem. After delivery I'm facing issue while starting my bike. When i press the ignition button bike struggles to start up like not getting enough power from the battery and then in a second it starts. I even rode for 100 kilometers and checked, the same problem exists. I need a suggestion on this

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