Inboard Boat Parts

Keep your inboard boat running strong with genuine replacement parts for Mastercraft, Supra, Moomba, and other top performance brands. Whether you own a ski boat, wakeboard boat, or wakesurf boat, WaterSkis.com has the inboard boat parts you need to keep your time on the water uninterrupted.

Explore our curated selection of Mastercraft boat parts, Supra boat parts, Moomba boat parts, and more—sourced from trusted OEMs and aftermarket brands known for quality, compatibility, and long-term durability. Our inventory includes engine components, electrical parts, ballast fittings, and maintenance essentials tailored to inboard boats used for watersports.

Not sure what fits your boat? Use our Boat Part Lookup Tool to match parts by make, model, and year for total confidence. At WaterSkis.com, we’re committed to helping you get back to skiing, surfing, and riding—with gear that performs when it counts.


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  • Ilmor GDI Thermostat | PV07759

    Ilmor GDI Thermostat | PV07759

    Ilmor
    $39.99
    Ilmor GDI Thermostat | PV07759 Have a boat engine that doesn’t seem to heat up? A lot of times, that problem is caused by a worn-out thermostat. Replace those failing thermostats this thermostat specifically designed to fit your Ilmor engine.  
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    $39.99
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  • Ilmor G5 Expansion Tank | 50H-0062

    Ilmor G5 Expansion Tank | 50H-0062

    Ilmor
    $59.99
    Ilmor G5 Expansion Tank | 50H-0062 This coolant expansion tank is the direct replacement part for your factory-installed Ilmor coolant expansion tank.  
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    $59.99
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  • Ilmor O2 Upstream Sensor | PV07124

    Ilmor O2 Upstream Sensor | PV07124

    Ilmor
    $159.99
    Ilmor O2 Upstream Sensor | PV07124 Ilmor specified oxygen sensor is the recommended replacement for your Ilmor engine. The sensors provide special feedback to your engine’s exhaust system by measuring the proportion of oxygen in the exhaust gases. Using...
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    $159.99
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  • Imor EPDM | 50H-0116

    Imor EPDM | 50H-0116

    Ilmor
    $714.99
    Imor EPDM | 50H-0116 Ilmor genuine EPDM is designed to take the headache out of using traditional fuses, making servicing a dream. This is a direct replacement for your engines factory EPDM unit.  
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    $714.99
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  • Ilmor Thermostat Gasket | PV07351

    Ilmor Thermostat Gasket | PV07351

    Ilmor
    $10.99
    Ilmor Thermostat Gasket | PV07351 This Ilmor specified thermostat gasket offers application-specific materials to give you a sealing solution with durability and reliability you can trust.  
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    $10.99
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  • Ilmor O2 Sensor Downstream | PV07075

    Ilmor O2 Sensor Downstream | PV07075

    Ilmor
    $89.99
    Ilmor O2 Sensor Downstream | PV07075 Ilmor specified oxygen sensor is the recommended replacement for your Ilmor engine. The sensors provide special feedback to your engine’s exhaust system by measuring the proportion of oxygen in the exhaust gases...
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  • Ilmor O-Ring, Plenum Mounting

    Ilmor O-Ring, Plenum Mounting

    Ilmor
    $3.99
    Ilmor O-Ring, Plenum Mounting The Ilmor plenum mounting o-ring is designed for the best performance and reliability for your boat. It is manufactured using the same high-quality materials used when your engine first comes off the line.  
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    $3.99
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  • Ilmor Brass Plug 1/4 | 1090

    Ilmor Brass Plug 1/4 | 1090

    Ilmor
    $4.99
    Ilmor Brass Plug 1/4 | 1090 Genuine Ilmor 1/4″ brass plug is made from top quality materials to ensure a long-lasting life of the plug.  
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    $4.99
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  • Ilmor High Pressure Fuel Filter | PV07863

    Ilmor High Pressure Fuel Filter | PV07863

    Ilmor
    $45.99
    Ilmor High Pressure Fuel Filter | PV07863 Ilmor’s high-pressure fuel filter keeps your engine running at peak performance. With this filter, you can count on delivering the purest gas, ensuring your injectors’ long-lasting protection...
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    $45.99
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  • Ilmor Raw Water Pump Key | PV05722

    Ilmor Raw Water Pump Key | PV05722

    Ilmor
    $9.99
    Ilmor Raw Water Pump Key | PV05722 The genuine Ilmor raw water pump key is specially designed to fit original factory specifications providing you a fit you can count on.  
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    $9.99
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  • Ilmor Idler Pulley | PV06693

    Ilmor Idler Pulley | PV06693

    Ilmor

    $29.99
    Ilmor Idler Pulley | PV06693 The Ilmor idler/tensioner pulleys are built with smoother surfaces and tighter dimensional tolerances, which translates to less vibration, longer pulley life and therefore longer pulley life.  
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  • Ilmor Fuel Injector Assembly | 1095

    Ilmor Fuel Injector Assembly | 1095

    Ilmor
    $179.99
    Ilmor Fuel Injector Assembly | 1095 This Ilmor specified fuel injector assembly is our recommended replacement for your engine’s original component.  
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    $179.99
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  • Ilmor Water Pump Gasket | PV06732

    Ilmor Water Pump Gasket | PV06732

    Ilmor
    $10.99
    Ilmor Water Pump Gasket | PV06732 This Ilmor water pump gasket features quality materials to give you a sealing solution needed to maintain OEM specified reliability and durability.  
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    $10.99
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  • Ilmor Thermostat Flat Rubber Gasket | 500-0044

    Ilmor Thermostat Flat Rubber Gasket | 500-0044

    Ilmor
    $4.99
    Ilmor Thermostat Flat Rubber Gasket | 500-0044 This Ilmor flat rubber thermostat gasket consists of quality materials to give you a sealing solution with performance and reliability you can trust.  
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    $4.99
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  • Ilmor Stainless Freeze Plug | PV05997

    Ilmor Stainless Freeze Plug | PV05997

    Ilmor
    $1.99
    Ilmor Stainless Freeze Plug | PV05997 The Ilmor stainless steel freeze plug features a concave design to ensure a leak-proof fit for your engine.  
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    $1.99
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  • Ilmor Idler Pulley | PV06474

    Ilmor Idler Pulley | PV06474

    Ilmor
    $44.99
    Ilmor Idler Pulley | PV06474 The Ilmor idler/tensioner pulleys are built with smoother surfaces and tighter dimensional tolerances, which translates to less vibration, and therefore longer pulley life.  
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  • Ilmor Fuel Injector Assembly | 1011

    Ilmor Fuel Injector Assembly | 1011

    Ilmor
    $111.99
    Ilmor Fuel Injector Assembly | 1011 This Ilmor specified fuel injector assembly is our recommended replacement for your engine’s original component.  
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    $111.99
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  • Ilmor Exhaust Manifold to Head Gasket | 1057

    Ilmor Exhaust Manifold to Head Gasket | 1057

    Ilmor
    $55.99
    Ilmor Exhaust Manifold to Head Gasket | 1057 Ilmor exhaust manifold gasket gaskets offer factory specified materials to give you sealing solutions with the performance and durability you can rely on.  
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  • Ilmor 20PSI Pressure Cap | PV07058

    Ilmor 20PSI Pressure Cap | PV07058

    Ilmor
    $14.99
    Ilmor 20PSI Pressure Cap | PV07058 A faulty coolant system cap can cause your boat to boil-over at a lower temperature. With the Ilmor 20 PSI pressure cap, you can rest easy knowing that proper pressure will be maintained. Ilmor recommends that you test...
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    $14.99
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Whether you're fixing a small issue or tackling a full-season tune-up, WaterSkis.com is your go-to source for inboard boat parts that match your boat and your lifestyle. We carry trusted parts for MasterCraft, Supra, Moomba, and other leading ski and wakeboard boats—all backed by our expert support. Need help finding the exact part? Use our Boat Part Lookup Tool for a fast, accurate match. And don’t forget to check out related categories like Boat Cleaning Products and Ballast System Parts to complete your setup.