piston wont move when pedaling

i have a hero gizmo i just notice when i go to start it i go to pedal but it takes a few pedals before the piston start to move is that normal? i look at the pully where the belt goes on but i dont know how to take the bolt of what kind of tool do i need? another thing when i pull out from a dead stop it sounds like the belt slips a little but the belt looks new .

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