Engine RPM Limiter
IMPORTANT: This engine is equipped with a RPM limiter. This limit is slightly above the normal operating range of the engine
and is designed to help prevent damage from excessive engine RPM. When the engine reaches the RPM limiter, the horn will
sound. Once the RPM drops into the recommended operating RPM range, normal engine operation resumes.
Getting Started
20‑Hour Break‑In Period
IMPORTANT: The first 20 hours of operation is the engine break‑in period. Correct break‑in is essential to obtain minimum oil
consumption and maximum engine performance. During this break‑in period, the following rules must be observed:
• Do not operate below 1500 RPM for extended periods of time for the first 10 hours. Shift into gear as soon as possible after
starting and advance the throttle above 1500 RPM if conditions permit safe operation.
• Do not operate at one speed consistently for extended periods.
• Do not exceed 3/4 throttle during the first 10 hours. During the next 10 hours, occasional operation at full throttle is
permissible (five minutes at a time maximum).
• Avoid full throttle acceleration from idle speed.
• Do not operate at full throttle until the engine reaches normal operating temperature.
• Frequently check engine oil level. Add oil as needed. It is normal for oil consumption to be high during the break‑in period.
After the Break‑In Period
To help extend the life of your Mercury MerCruiser power package, follow these recommendations:
• Ensure that the propeller allows the engine to operate at or near the top of the specified wide‑open throttle (WOT) RPM
range. Refer to Specifications and Maintenance.
• Operate the engine at 3/4 throttle or lower. Refrain from prolonged operation at WOT RPM.
End of First Season Checkup
At the end of the first season of operation, contact an authorized Mercury MerCruiser dealer to discuss and/or perform
scheduled maintenance items. If you are in an area where the product is operated continuously, year‑round, you should contact
your dealer at the end of the first 100 hours of operation or once yearly, whichever occurs first.
Section 2 - On the Water
90-8M0128973 eng MAY 2017 Page 33
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