Mercury Jet 20 Manual page 63

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Starting The Engine – Tiller Handle Models
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Push in the primer/idle speed knob after engine starts. If engine begins to stall,
re-prime until engine is running smoothly.
NOTE: Starting Flooded Engine – push in the primer/idle speed knob and turn full
clockwise. Continue to crank the engine for starting.
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Turn the primer/idle speed knob counterclockwise (direction of arrow) to obtain
desired idle speed as engine warms up.
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Check for water flowing out of the water pump indicator hole. For models
equipped with a thermostat, the amount of water flow can vary, from droplets to
a full spray, due to the thermostat operation. It may take several minutes for the
engine to warm up enough for water to start spraying out of the indicator hole.
IMPORTANT: If no water is coming out of the water pump indicator hole, stop
engine and check cooling water intake for obstruction. No obstruction may
indicate a water pump failure or blockage in the cooling system. These
conditions will cause the engine to overheat. Have the outboard checked by
your dealer. Operating the engine while overheated may cause serious engine
damage.
OPERATION
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