Therstfty(50)hoursofoperationarethemostimportantfor
theboat.Properbreak-inwillensuremaximumperformanceandthe
longestpossiblepower-trainlife.Thebreak-inperiodallowsmoving
partswithintheengineandtransmissiontowear-inproperly.AllMas-
terCraftboatsarelake-testedonthewaterbeforeleavingthefactory,
butthebreak-inmustcontinuefortherstfty(50)hoursofyour
ownership.
To ensure proper break-in and lubrication, boat owners
should not remove the factory break-in oil until after the
initial ten (10) hours of operation. At that time, an oil
change should be performed on the Indmar engines by
an authorized MasterCraft service technician at an au-
thorized MasterCraft dealer.
Failure to follow the break-in procedure exactly as stated
will void the engine warranty!
NOTE: Before operating the boat for the rst time you must
read the engine manufacturer’s manual completely in addition
to this Manual!
Pleasefollowthebreak-inprocedurecarefully.Closeattentionto
thefollowingisveryimportant:
• Maintain the proper oil level. Untilthe piston rings, cylinder
andotherworkinginternalpartsarethoroughlyseated,oilcon-
sumptioncanbehighandmustbecarefullywatched.(Thiscontin-
uestobeimportantafterbreak-in,aswell).
• Pay close attention to the gauges.Itisimportanttostopthe
engineimmediatelyifthegaugesindicateaproblem.Lowoilpres-
sureandoverheatingareseriousissuesandrequireimmediateat-
tention.
• Abnormal vibration or noises.Thesesymptomscanprecede
trouble and should not be ignored. Occasionally, hardware may
workloose,mountingsmayneedtobetightenedorthedriveline
mayrequireattention.
new b oat b rea k-i n
• Fuel, oil or water leaks. Leakscanposeaserioussafetythreat.
Ifoneoccurs,itismostlikelytodosoafterafewhoursofopera
-
tion.
• Vary the engine speed. Never run the engine for morethan
three(3)minutesatanyconstantRPMduringthebreak-inperiod.
Doingthiswillassistintheproperbreak-inofringsandbearings.
• Plane the boat quickly. Operatingtheboatatlowspeedsplaces
anexcessiveloadontheengine.Planequickly,thenbackdowntoa
slowerspeed.
First Hours of Operation
Eachenginemanufacturerhasdetailedandspecicrequirements
forproperengine break-in.That information is foundinthe engine
manualsupplied,andmustbefollowedexactlyasindicated.Failureto
dosocouldcauseenginedamageand/orfailurethatisnotcovered
underwarranty.
After Break-In
Oncethebreak-inperiodisover,theboatmaybeoperatedcon-
tinuouslyatanyspeed,butnotbeyondthemaximumindicatedinthe
enginemanual.
The engines are equipped with rev-limiters which will cause a
utteringsoundwhenreached.Iftheboathasthecorrectpropeller
set-up,operatorsshouldneverreachthelimiter,butifthathappens,
itisasignalthatyoushouldreducethethrottleandcheckwithan
authorizedMasterCraftdealertodeterminethecause.
Alwaysrememberthatduringnormaloperationyoushouldallow
theenginetowarmupgradually.Besuretheengineiswarmbefore
accelerating.Pay careful attention to thegauges.Also, check theoil
levelfrequentlyduringtherstfty(50)hoursofoperationsincethe
pistonringsandcylindersrequirethatmuchtimetoseatproperly.
See the Scheduled Maintenance Checks and Services section for
moredetails.
Failure to follow the engine oil recommendations listed
in the engine manual can cause additional engine wear
and increase the possibility of engine component fail-
ure. Damage to the engine due to incorrect oil usage can
be costly to repair, and is not covered by the warranty!
mastercraft 2010 ow n e r ’s m anual • page 9-1