• Warmer weather and greater humidity cause a loss of RPM.
• Operating in a higher elevation causes a loss of RPM.
• Operating with increased load (additional passengers, pulling skiers) causes a loss of RPM.
For better acceleration, such as is needed for waterskiing, use the next lower pitch propeller. Do not operate at full throttle
when using the lower pitch propeller but not pulling skiers.
Because of the many variables of boat design, only testing will determine the best propeller for a particular application.
Available propellers are listed in the Mercury Precision Parts Accessories Guide.
6.2L Maximum RPM Specification
Maximum Rated RPM
Engine Model Maximum RPM
6.2L (sterndrive/inboard)
223 kW (300 hp) 5000–5400
260 kW (350 hp) 5000–5400
6.2L (TowSport)
238 kW (320 hp) 5000–5400
275 kW (370 hp) 5000–5400
Boat‑in‑the‑Water Tests
Engine Idle Speed
The engine should idle at the RPM as specified in the appropriate Operation, Maintenance and Warranty Manual with boat in
the water, drive unit in forward gear, and the engine at normal operating temperature. If the idle speed is incorrect, ensure that
the throttle cable has been adjusted properly.
Adaptive Speed Control (ASC) Propping with G3
IMPORTANT: Propping of the boat can be done as normally done with all other MerCruiser products, but to achieve the best
optimum propeller selection you can use the propping procedure with the G3 tool to verify your propeller selection.
NOTE: The following procedure explains propping on an engine with a RPM specification that is 4800–5200. This same
process can be used for other ASC engines with a different RPM range. The dynamic principle is the same. Refer to your
engine's wide‑open throttle (WOT) range and substitute the minimum/maximum WOT RPM in the following procedure.
A special propping procedure using CDS G3 should be used for optimum propping.
• Install the best guess propeller.
• Run the engine at 100% Demand Linear (demand request by operator) with optimum trim. The Demand (demand request
by control software) and Demand Linear with Guardian (demand request by Guardian) should both equal 100%.
• If RPM is less than 4800 but the Demand (demand request by control software), Demand Linear (demand request by
operator), and Demand Linear with Guardian (demand request by Guardian) are all 100%, install a smaller pitch propeller.
• If RPM is greater than 5200 even momentarily, and Demand (demand request by control software) and Demand Linear
with Guardian (demand request by Guardian) cannot both reach 100%, install a larger pitch propeller. (This means
software Demand is pulling back on the throttle to stop from overspeed.)
Installation
Page 2B-48 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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