Inboard Boat Parts

Get the performance and reliability your inboard boat demands with premium replacement parts from WaterSkis.com. Whether you’re maintaining a MasterCraft, Supra, or Moomba boat, we offer a wide selection of genuine and OEM-compatible inboard boat parts to keep your engine, drivetrain, and cooling systems running strong.

From impellers and ignition components to thermostats and transmission parts, every item in this category is curated for quality, compatibility, and long-lasting performance. Not sure where to start? Use our Boat Part Lookup Tool to instantly find the exact part you need for your specific make, model, and engine configuration.

At WaterSkis.com, we know your time on the water matters. That’s why we make it easy to find the right boat parts—fast, accurate, and backed by real-world expertise.


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  • Mastercraft Composite Dripless Drive Shaft Seal Mastercraft Composite Dripless Drive Shaft Seal

    Mastercraft Composite Dripless Drive Shaft Seal

    MasterCraft
    MSRP: $179.99
    $169.99
    Mastercraft Composite Dripless Drive Shaft Seal MasterCraft Dripless Drive Shaft Seal designed to cool and lubricate drive shaft while keeping water out of the boat. Utilizes dual graphite lip seal technology for a dripless seal. Designed to be used with...
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    MSRP: $179.99
    $169.99
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  • Ilmor Impeller Puller Tool Kit (PT02125)

    Ilmor Impeller Puller Tool Kit

    Ilmor
    $36.99
    Ilmor Impeller Puller Tool Kit (PT02125) Use the boat part look up below to ensure you are purchasing the correct part for your MasterCraft Boat!  
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    $36.99
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  • Chrome MasterCraft Gas Cap

    Chrome MasterCraft Gas Cap by Perko

    $72.99
    Chrome MasterCraft Gas Cap Replace your lost, stolen or just old MasterCraft gas cap. This is a stock MasterCraft Gas Cap replacement for all boats. Featuring a standard two prong key open close with connecting holding chain to ensure you don't drop it...
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    $72.99
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  • Supra | Moomba Rudder Assembly | 425

    Supra | Moomba Rudder Assembly | 425

    Skiers Choice
    $799.99
    Supra | Moomba Rudder Assembly | 425 This is a complete rudder and rudder port assembly for Supra and Moomba Boats. This was used on many direct drive Supra Boats and Moomba Boats. Use the Boat Part Lookup to ensure you are getting the correct part for...
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    $799.99
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  • 20' Steering Cable

    20' Steering Cable

    Skiers Choice
    $299.99
    20' Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 20' Steering cable is a direct replacement for many Supra and Moomba boats. A new steering cable helps keep your boat operating in peak performance...
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    $299.99
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  • 19' MasterCraft Steering Cable

    19' Steering Cable

    SeaStar Solutions

    $249.99
    19' MasterCraft Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 19' MasterCraft Steering Cable is a direct replacement for Many MasterCraft boats produced from 1999 to 2012. A new steering cable...
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    $249.99
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  • 24' MasterCraft Steering Cable

    24' Steering Cable

    SeaStar Solutions
    $299.99
    24' MasterCraft Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 24' Steering cable is a direct replacement for Many MasterCraft boats. A new steering cable helps keep your boat operating in peak...
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    $299.99
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  • 17' Rotary Steering Cable

    17' Rotary Steering Cable

    SeaStar Solutions
    $199.99
    17' MasterCraft Rotary Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 17' Steering cable is a direct replacement for Many MasterCraft boats. A new steering cable helps keep your boat operating in...
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    $199.99
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  • 22' Steering Cable

    22' Steering Cable

    Skiers Choice
    $299.99
    22' Steering Cable When the steering on your boat gets stiff it's time to replace the steering cable. This 22' Steering cable is a direct replacement for many Supra and Moomba boats. A new steering cable helps keep your boat operating in peak...
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    $299.99
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  • Steering Cable Adapter

    Steering Cable Adapter for Rotary Cables

    SeaStar Solutions
    $32.99
    Steering Cable Adapter This steering cable adapter is REQUIRED when installing a new rotary Steering cable in Select MasterCraft boats produced from 1991 to 1999. Use the boat part look up below to ensure you are purchasing the correct part for your boat...
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    $32.99
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  • Supra Boats Black Hull Decal

    Supra Boats Black Hull Decal

    Supra Boats
    $699.99
    Supra Boats Black Hull Decal Give your Supra Boat an updated look with the New OEM Black ChroMax Decal. The Black ChroMax decal has raised lettering.This decal is sold individually. Use the boat part look up below to ensure you are purchasing the correct...
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    $699.99
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  • Supra Boats Chrome Hull Decal

    Supra Boats Chrome Hull Decal

    Supra Boats
    $699.99
    Supra Boats Chrome Hull Decal Give your Supra Boat an updated look with the New OEM ChroMax Decal. The ChroMax decal has raised lettering.This decal is sold individually. Use the boat part look up below to ensure you are purchasing the correct part for...
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    $699.99
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  • Prop Nut for 1-1/4" Shafts

    Prop Nut for 1-1/4" Shafts

    OJ Props
    $29.99
    Inboard Prop Nut for 1-1/4" Shafts A simple replacement for you lost or damaged inboard prop nut. This is a universal part that fits MasterCraft, Malibu, Supra, and Nautique boats with a 1-1/4" drive shaft. Don't be a fool, keep a spare on hand...
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    $29.99
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  • MasterCraft Gauge - Tach White 2006

    MasterCraft Gauge - Tach White 2006

    MasterCraft
    $1,499.99
    MasterCraft Gauge - Tach White 2006 MasterCraft Gauge - Tach. White face. Use the boat part look up below to ensure you are purchasing the correct part for your boat.  
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    $1,499.99
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  • OJ SKIPRO Prop 13.9X14.25-4 Blade | Splined | Bore 1 1/8" | LH

    OJ SKIPRO Prop 13.9X14.25-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $660.00
    $561.00
    OJ SKIPRO Prop 13.9X14.25-4 Blade | Splined | Bore 1 1/8" | LH The OJ SKIPRO V-4 1709 4 Blade 13.9" X 14.25" LH-4 BLADE SPLINED BORE Propeller features a new blade shape and pitch distribution along with OJ's unique cupping feature for better top end...
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    MSRP: $660.00
    $561.00
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  • OJ SKIPRO Prop 14X13.5-3 Blade | Splined | Bore 1 1/8" | LH

    OJ SKIPRO Prop 14X13.5-3 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $605.00
    $514.25
    OJ SKIPRO Prop 14X13.5-3 Blade | Splined | Bore 1 1/8" | LH The OJ SKIPRO V-3 867 3 Blade 14" X 13.5" LH-3 BLADE SPLINED BORE Propeller boasts an enhanced pitch distribution along with a new blade shape that produces better top end and low end power. Use...
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    MSRP: $605.00
    $514.25
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  • OJ Evolution Prop 18X17.5-4 Blade | Splined | Bore 1 1/4" | LH

    OJ Evolution Prop 18X17.5-4 Blade | Splined | Bore 1 1/4" | LH

    OJ Props
    MSRP: $1,173.00
    $997.05
    OJ Evolution Prop 18X17.5-4 Blade | Splined | Bore 1 1/4" | LH The OJ Evolution 3602-MF 4 Blade 18" X  17.5" LH 4-BLADE SPLINED BORE Propeller features a complete blade shape and pitch distribution redesign. Evolving from our successful WAKEPRO and...
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    MSRP: $1,173.00
    $997.05
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  • OJ Evolution Prop 15X12-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Evolution Prop 15X12-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $853.00
    $725.05
    OJ Evolution Prop 15X12-4 Blade | Splined | Bore 1 1/8" | LH The OJ Evolution 3043-MF 4 Blade 15" X  12" LH 4-BLADE SPLINED BORE Propeller features a complete blade shape and pitch distribution redesign. Evolving from our successful WAKEPRO and V-4...
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    MSRP: $853.00
    $725.05
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  • OJ Evolution Prop 15X13-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Evolution Prop 15X13-4 Blade | Splined | Bore 1 1/8" | LH

    OJ Props
    MSRP: $853.00
    $725.05
    OJ Evolution Prop 15X13-4 Blade | Splined | Bore 1 1/8" | LH The OJ Evolution 3033-MF 4 Blade 15" X 13" LH 4-BLADE SPLINED BORE Propeller features a complete blade shape and pitch distribution redesign. Evolving from our successful WAKEPRO and V-4...
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    MSRP: $853.00
    $725.05
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At WaterSkis.com, we combine deep product knowledge with industry-leading tools to help boat owners find the exact inboard boat parts they need. Whether you're working on a MasterCraft, Supra, or Moomba, our parts deliver the fit and reliability you can trust.

Use our Boat Part Lookup Tool to simplify your search, or explore related categories like cooling systems, engine components, and ignition parts. We’ve got everything you need to keep your boat running at its best.