Mercury SST 120/S2000, User Manual, Page: 33 / 62

29
OPERATION
Engine Break-In
CAUTION
Severe damage to the engine can result by not complying with
the Engine Break-in Procedure.
BREAK-IN PROCEDURE
Partial break-in is done at the factory. Additional break-in is
recommended. During and after break-in, use a 32:1 gasoline/
oil mixture in your fuel tank.
Increasing load on engine during break-in:
- Use largest appropriate propeller
- Operate with the engine trimmed in
FIRST 1/2 HOUR - Operate your outboard at various RPM
range between (3500 - 4500 RPM).
SECOND 1/2 HOUR - Operate your outboard at various RPM
range between (3500 - 6000 RPM).
AFTER FIRST HOUR OF BREAK-IN - Run engine for additional
15 minutes during acceleration runs starting at 3500 RPM up to
W.O.T. Do not sustain W.O.T. for more than 1 minute.
CAUTION
It is the boat operators responsibility to always drive in a safe
manner. Improper trim angle of the outboard when driving at
speed can be difficult and dangerous. Trim angle is specified
to help guide the operator in determining how to put the
proper load on the engine during the break-in period. These
guidelines do not suggest or require unsafe boat operation.
NOTE: After Break-in is complete, change carburetor jetting.
These engines have break-in jets (six) installed at the factory. After
break-in, remove the six (6) main jet holders and jets and replace with
run jets sent with the engine. Reinstall jet holders making sure gas-
kets are in place. These jets will provide maximum power when used
in the 70-75
°
F (21-24
°
C) range. In cooler conditions, increase jet
size. Warmer conditions, decrease. For each 10
°
F (6
°
C) of temper-
ature change, increase or decrease one jet size in each location.