Puch Magnum II MKII Owner's Manual page 11

10
Fuel valve
The fuel valve is located on the left side of the fuel tank.
The positions are clearly indicated on the tank .
In the event you should run out of fuel, the reserve position
should give you adequate range to get you to a filling station.
Always turn the fuel valve to the "Off" position when the moped
is not in use.
Carburetor
1) The primer is operated by depressing the black rod extending
through the left engine cover.
2) The choke is operated by depressing the metal thrust pin
which extends upward toward the opening in the left
engine cover.