I recently buy activa 5g. After 1day of unused conditions when I start

I recently buy activa 5g. After 1day of unused conditions when I start the scooty by kick, after 2or 3 kicks the engine will start but when I accelerate it will stop. The whole procedure is carried on double stand position. After 2 or more try the scooty came to running conditions. But initially the acceleration doesn't work smoothly, initial acceleration takes after a few seconds suddenly. But these problems was gone after some distance run. What was the actual cause of this problem. The age of my scooty, activa 5g is just 10 days. Please provide me the solution as soon as possible.

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