Pre-Starting Instructions; Engine Break-In Procedure - Mercury jet 20 Manual

It is possible for debris to lodge between the impeller and jet housing wall, especially after the engine has been
stopped. This will lock the driveshaft and will prevent the engine from being able to crank over for starting.
Following are steps for dislodging the impeller.
1. Position lanyard stop switch to the "OFF" position.
2. Remove spark plug leads to prevent the engine from accidentally starting.
3. Remove flywheel or rewind cover and rotate the engine flywheel counterclockwise.
If this does not dislodge the impeller, it will be necessary to remove the six screws and water intake housing.
Pre‑Starting Instructions
1. Connect the remote fuel line to the outboard. Make sure connector is snapped into place.
Never start or operate your outboard (even momentarily) without water circulating through all the cooling
water intake holes in the gearcase to prevent damage to the water pump (running dry) or overheating of
the engine.
2. Make sure the driveshaft bearing on the jet drive is lubricated. Refer to Maintenance ‑ Lubrication Points.
Engine Break‑in Procedure
Severe damage to the engine can result by not complying with the Engine Break‑in Procedure.
ENGINE BREAK-IN FUEL MIXTURE
Use a 25:1 (4%) gasoline/oil mixture in the first tank of fuel.
BREAK-IN PROCEDURE
Vary the throttle setting during the first hour of operation. During the first hour of operation, avoid remaining at
a constant speed for more than two minutes and avoid sustained wide open throttle.
OPERATION
CAUTION
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CAUTION
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