Engine Emissions
2007 MasterCraft Owners Manual - Page 16-1
The following information pertains to the Indmar engine utilized in many MasterCraft models. If your boat
features a Crusader engine, please refer to the manual supplied by that manufacturer.
TheinboardengineinyourboatincludestheIndmarEmissionControlSystemidentiedas
MFIorTBIorEM.Refertotheidenticationstickeronyourenginetodeterminewhichemission
controlsystemwasusedonyourengine.Thefuelandignitionsystemsonyourenginemeetthe
stringent requirements set forth by the California Air Resources Board (CARB). Indmar also uses
Sierra brand anti-freeze in the closed cooling system of your engine to reduce the environmental
impact in the event that anti-freeze is expelled from the engine.
The Star Label means Cleaner Marine Engines
This engine has been certifi ed as:
The Symbol for Cleaner Marine Engines:
Cleaner Air and Water
For a healthier life-style and environment.
Better Fuel Economy
Burns up to 30-40 percent less gas and oil than conventional carbureted
two-stroke engines, saving money and resources.
Longer Emission Warranty
Protects consumer for worry-free operation.
Your Indmar-manufactured engine has a spe-
cial environmental label required by the California Air
Resources Board (CARB). The label has 1, 2, 3 or 4
stars. A hangtag, provided with your inboard engine,
describes the meaning of the star system.
Operating Fuels and Lubricants
In order to keep your engine operating ef-
ciently and to maintain the Emission Control System the
following requirements must be observed.
Fuel—Yourenginewasdesignedandcertied
to operate on the unleaded fuels listed below. Fuel rat-
ingsmustbebasedonthe(R+M)/2methodandmeetthespecicationsASTMD4814intheU.S.Thesefuelsneedno
additives for proper operation.
MasterCraft LY6 engine 93 octane
AllotherMasterCraftIndmarengines 89octane
Lubricant—Indmar uses and recommends 15W40 marine oil for use in all of its engines, meeting the API rat-
ings of CF/SJ, CG-4, CH-4. See the Operator’s Manual for information regarding the use of synthetic oil.
Additives—The only additive that is recommended by Indmar for use in your engine is Sta-Bil brand fuel stabi-
lizer. This additive helps preserve the fuel in your tank and in the engine’s fuel system. We recommend the use of Sta-Bil
during off-season storage and for the boat that will consume less than a full tank of fuel every two weeks. See the Fuel
section of your Operator’s Manual.
Emission Components Warranty
The following components are considered as part of the emissions control system and are covered under the
Emissions Control Warranty.
1. Fuel metering system
a. Fuel injectors
b. Fuel pressure regulator
c. Manifold absolute pressure (MAP) sensor
d. Throttle position sensor
e. Idle air control (IAC) valve
f. Throttle body – port fuel injection models
g. Throttle body assembly – throttle body fuel injection models
h. Coolant temperature sensor
i. Intake valves
2. Air Induction System
a. Intake manifold
b. Airlter(flamearrestor)
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