2021 OWNERS MANUAL / 338
Maneuvers of this nature could cause serious injury or death, as
well as damage to your MasterCraft boat that will not be covered
under warranty.
Boat operators should never attempt to duplicate operational skills
of professional drivers. When such maneuvers fail, it can result in
serious injury or death.
For the best engine performance and longevity, the wide-open-
throttle (WOT) engine operation must be near the top of, but within,
the specified WOT operating range. To adjust the WOT operating
range, select a propeller with the proper diameter and pitch. The
propeller supplied on the boat was chosen for best all-around per-
formance under average operating conditions.
Load, weather, altitude and boat condition all aect WOT engine
operation. If the boat is used for several dierent applications such
as wakeboarding, barefooting and cruising, it may be necessary to
have two (2) or more propellers of diering size and pitch to allow
the engine to operate in the WOT range for each application.
Propping the boat should be done after the boat is loaded in the
manner in which it would normally be loaded for each application. For
example, in propping the boat for wakeboarding, fill the ballast tanks
and add the people and gear that normally would be expected
in the boat. Take the boat out and after warm-up, run it at wide-
open-throttle and note the maximum RPM. EFI engines are
equipped with RPM limiters to prevent over-revving. Take note if the
RPM limiter is activated.
If the WOT RPM is higher than the maximum RPM in your engine’s
WOT operating range, the boat is under-propped. Installing a high-
er-pitched propeller will reduce the WOT RPMs. An engine that is
over-revving may quickly experience catastrophic damage, which
will not be covered under warranty.
If the WOT RPM is lower than the minimum RPM in your engine’s
WOT operating range, the boat is over-propped. Installing a lower-
pitched propeller will increase WOT RPMs.
An engine that is under-revving is “lugging.” This places a tremen-
dous load on the pistons, crankshaft and bearings and can cause
detonation, piston seizure and other engine damage, which will not
be covered under warranty.
Engines should always be operated within engine manufacturer
guide lines. Failure to do so may cause significant damage to the
engine and drive train and is not covered under warranty!
Elevation and weather also have a very noticeable eect on the
wide open throttle power of an engine. Since oxygen gets thinner as
elevation increases, the engine begins to starve for air.
2021MCOwnerManualFINAL.indd 338 8/26/20 1:54 PM
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