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PROX

PROX

PROX

Prox Pistons, Gaskets, and Engine Components at JJ Motorsports

Prox, established in the late 1970s, is a respected brand in the powersports industry, specializing in high-performance aftermarket parts for motorcycles, ATVs, and off-road vehicles. With a focus on quality and innovation, Prox offers OEM-style replacements that deliver exceptional reliability and performance for both recreational riders and professionals.

At JJ Motorsports, we provide a comprehensive selection of Prox products, including complete gasket kits, top-end gasket sets, piston kits, connecting rod kits, crankshaft bearing/seal kits, and more. Whether you're rebuilding an engine or upgrading for better durability, Prox delivers precise-fit solutions compatible with major brands like Honda, Kawasaki, Suzuki, and KTM. Explore our inventory to find the ideal parts for your vehicle.

Key features of Prox products include precision engineering to OEM specifications, use of high-silicon-content aluminum alloys for pistons, double-forged construction for strength, and complete kits for easy installation. Shop now and enhance your powersports performance with Prox!

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • On Sale
    PROX Repair Kit - Master Cylinder - Clutch 16.940004

    PROX Repair Kit - Master Cylinder - Clutch 16.940004

    PROX

    MSRP: $37.95
    Now: $30.00
    Was: $37.95
    A worn or failing clutch master cylinder compromises your ability to engage and disengage smoothly, risking safety and driveability. Rather than replacing the entire unit, this PROX rebuild kit gives...
    06170264
    SKU:
    06170264
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    BASE FINISH:
    RAW
    COLOR/FINISH:
    BLACK
    BASE COLOR:
    BLACK
    PRODUCT NAME:
    REBUILD KIT
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    COLOR/FINISH:
    RAW
    TYPE:
    CLUTCH
    TYPE:
    MASTER CYLINDER
    MSRP: $37.95
    Now: $30.00
    Was: $37.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $37.95
    Now: $30.00
    Was: $37.95
    Subtotal:
  • On Sale
    PROX Fork Seal/Wiper Kit - 43 mm ID x 55 mm OD x 9 mm T 40.S43559

    PROX Fork Seal/Wiper Kit - 43 mm ID x 55 mm OD x 9 mm T 40.S43559

    PROX

    MSRP: $52.95
    Now: $42.00
    Was: $52.95
    Fork seals and wipers are critical wear items that directly impact suspension performance and longevity. Over time, degraded seals allow hydraulic fluid to escape and contamination to enter,...
    402435
    SKU:
    402435
    Availability:
    Ships Same Business Day
    Weight:
    0.19 LBS
    THICKNESS IMPERIAL:
    0.35'
    THICKNESS:
    9,00 MM (0,35')
    INSIDE DIAMETER:
    43,00 MM (1,69')
    OUTSIDE DIAMETER:
    55,00 MM (2,17')
    PRODUCT NAME:
    FORK SEAL/WIPER
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    MSRP: $52.95
    Now: $42.00
    Was: $52.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $52.95
    Now: $42.00
    Was: $52.95
    Subtotal:
  • On Sale
    PROX Fork Seal/Wiper Kit - 46 mm ID x 58 mm OD x 9 mm T 40.S46589

    PROX Fork Seal/Wiper Kit - 46 mm ID x 58 mm OD x 9 mm T 40.S46589

    PROX

    MSRP: $62.95
    Now: $51.00
    Was: $62.95
    Worn fork seals compromise suspension performance and allow hydraulic fluid to contaminate your stanchions—leading to accelerated wear and handling degradation. The PROX Fork Seal/Wiper Kit restores...
    402465
    SKU:
    402465
    Availability:
    Ships Same Business Day
    Weight:
    0.19 LBS
    OUTSIDE DIAMETER:
    58,00 MM (2,28')
    INSIDE DIAMETER:
    46,00 MM (1,81')
    THICKNESS IMPERIAL:
    0.35'
    THICKNESS:
    9,00 MM (0,35')
    PRODUCT NAME:
    FORK SEAL/WIPER
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    MSRP: $62.95
    Now: $51.00
    Was: $62.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $62.95
    Now: $51.00
    Was: $62.95
    Subtotal:
  • On Sale
    PROX Top End Gasket Kit - Warrior/Raptor/Grizzly 35.2160

    PROX Top End Gasket Kit - Warrior/Raptor/Grizzly 35.2160

    PROX

    MSRP: $46.95
    Now: $38.00
    Was: $46.95
    A properly sealed top end is non-negotiable for engine reliability and performance. Over time, factory gaskets degrade from heat cycling and compression, leading to oil leaks, vacuum leaks, and...
    09347124
    SKU:
    09347124
    Availability:
    Ships Same Business Day
    Weight:
    0.15 LBS
    PRODUCT NAME:
    GASKET KIT
    RIDING STYLE:
    ATV
    UNITS:
    KIT
    TYPE:
    TOP END
    MSRP: $46.95
    Now: $38.00
    Was: $46.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $46.95
    Now: $38.00
    Was: $46.95
    Subtotal:
  • On Sale
    PROX Gasket Kit - Complete - KTM 34.6019

    PROX Gasket Kit - Complete - KTM 34.6019

    PROX

    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    A complete gasket kit is essential for any engine rebuild or top-end refresh, ensuring proper sealing across all critical engine interfaces and preventing costly oil and coolant leaks. The PROX...
    09345614
    SKU:
    09345614
    Availability:
    Ships Same Business Day
    Weight:
    0.30 LBS
    PRODUCT NAME:
    GASKET KIT
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    COMPLETE
    UNITS:
    KIT
    ENGINE TYPE:
    2-STROKE
    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    Subtotal:
  • On Sale
     PROX Top End Gasket Set - Kawasaki 35.4429

    PROX Top End Gasket Set - Kawasaki 35.4429

    PROX

    MSRP: $59.95
    Now: $51.00
    Was: $59.95
    A top-end rebuild demands gaskets that seal reliably under extreme combustion pressures and temperature fluctuations—anything less risks oil leaks, compression loss, and catastrophic engine failure...
    09347140
    SKU:
    09347140
    Availability:
    Ships Same Business Day
    Weight:
    0.16 LBS
    MSRP: $59.95
    Now: $51.00
    Was: $59.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $59.95
    Now: $51.00
    Was: $59.95
    Subtotal:
  • On Sale
     PROX Top End Gasket Set - Sherco 35.7334

    PROX Top End Gasket Set - Sherco 35.7334

    PROX

    MSRP: $54.95
    Now: $47.00
    Was: $54.95
    A top-end rebuild demands gasket integrity—any leak or failure compromises combustion efficiency and reliability. The PROX 35.7334 gasket set delivers precision-engineered sealing surfaces that...
    09347152
    SKU:
    09347152
    Availability:
    Ships Same Business Day
    Weight:
    0.16 LBS
    MSRP: $54.95
    Now: $47.00
    Was: $54.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $54.95
    Now: $47.00
    Was: $54.95
    Subtotal:
  • On Sale
     PROX Gasket Kit - Complete - Yamaha 34.2221

    PROX Gasket Kit - Complete - Yamaha 34.2221

    PROX

    MSRP: $74.95
    Now: $64.00
    Was: $74.95
    A complete gasket kit is essential for any top-end rebuild or full engine overhaul—it ensures proper sealing across all critical engine surfaces and prevents oil leaks, compression loss, and...
    09345547
    SKU:
    09345547
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    MSRP: $74.95
    Now: $64.00
    Was: $74.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $74.95
    Now: $64.00
    Was: $74.95
    Subtotal:
  • On Sale
    PROX Repair Kit - Master Cylinder - Clutch 16.940028

    PROX Repair Kit - Master Cylinder - Clutch 16.940028

    PROX

    MSRP: $32.95
    Now: $25.00
    Was: $32.95
    A worn or leaking clutch master cylinder compromises your pedal feel and can leave you stranded. The PROX Repair Kit gives you everything needed to restore OEM-level performance and reliability...
    06170431
    SKU:
    06170431
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    MSRP: $32.95
    Now: $25.00
    Was: $32.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $32.95
    Now: $25.00
    Was: $32.95
    Subtotal:
  • On Sale
    PROX Connecting Rod Kit - Kawasaki 03.4351

    PROX Connecting Rod Kit - Kawasaki 03.4351

    PROX

    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    A connecting rod failure at high RPM doesn't just end your day—it ends your engine. The PROX Connecting Rod Kit for Kawasaki engines is engineered to OEM specifications with double-forged...
    09230698
    SKU:
    09230698
    Availability:
    Ships Same Business Day
    Weight:
    1.15 LBS
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Subtotal:
  • On Sale
    PROX Connecting Rod Kit - Gas Gas | Husqvarna | KTM 03.6337

    PROX Connecting Rod Kit - Gas Gas | Husqvarna | KTM 03.6337

    PROX

    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The PROX 03.6337 kit uses double-forged construction with optimized grain flow to deliver...
    09230700
    SKU:
    09230700
    Availability:
    Ships Same Business Day
    Weight:
    1.20 LBS
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Subtotal:
  • On Sale
    PROX Connecting Rod Kit - Gas Gas | Husqvarna | KTM 03.6343

    PROX Connecting Rod Kit - Gas Gas | Husqvarna | KTM 03.6343

    PROX

    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    A connecting rod kit is critical to engine longevity and reliability—especially under high-load riding conditions where OEM components face constant stress. The PROX 03.6343 delivers OEM-equivalent...
    09230701
    SKU:
    09230701
    Availability:
    Ships Same Business Day
    Weight:
    0.65 LBS
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $232.95
    Now: $195.00
    Was: $232.95
    Subtotal:
  • On Sale
    PROX Top End Gasket Set - Kawasaki 35.4351

    PROX Top End Gasket Set - Kawasaki 35.4351

    PROX

    MSRP: $78.95
    Now: $64.00
    Was: $78.95
    A top-end rebuild demands precision gasket sealing—any leak or failure undermines your entire cylinder head work and costs you performance. The PROX Top End Gasket Set delivers OEM-grade sealing...
    09347769
    SKU:
    09347769
    Availability:
    Ships Same Business Day
    Weight:
    0.19 LBS
    MSRP: $78.95
    Now: $64.00
    Was: $78.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $78.95
    Now: $64.00
    Was: $78.95
    Subtotal:
  • On Sale
    PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6343

    PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6343

    PROX

    MSRP: $93.95
    Now: $76.00
    Was: $93.95
    Top-end gasket failures compromise cylinder sealing and allow combustion blow-by, robbing your engine of power and reliability. Whether you're rebuilding after a season of hard riding or performing...
    09347772
    SKU:
    09347772
    Availability:
    Ships Same Business Day
    Weight:
    0.20 LBS
    MSRP: $93.95
    Now: $76.00
    Was: $93.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $93.95
    Now: $76.00
    Was: $93.95
    Subtotal:
  • On Sale
    PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6439

    PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6439

    PROX

    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    A top-end rebuild demands gasket integrity—any leak compromises compression and performance. The PROX Top End Gasket Set delivers OEM-equivalent sealing across all critical combustion chamber...
    09347777
    SKU:
    09347777
    Availability:
    Ships Same Business Day
    Weight:
    0.24 LBS
    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $99.95
    Now: $81.00
    Was: $99.95
    Subtotal:
  • On Sale
    PROX Piston Kit - 77.96 mm - Kawasaki KX250/KX250X 01.4351.A

    PROX Piston Kit - 77.96 mm - Kawasaki KX250/KX250X 01.4351.A

    PROX

    MSRP: $188.95
    Now: $158.00
    Was: $188.95
    A worn or damaged piston directly compromises your KX250/KX250X's compression, throttle response, and overall reliability. The PROX 77.96 mm Piston Kit restores factory performance specifications...
    09106786
    SKU:
    09106786
    Availability:
    Ships Same Business Day
    Weight:
    0.40 LBS
    MSRP: $188.95
    Now: $158.00
    Was: $188.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $188.95
    Now: $158.00
    Was: $188.95
    Subtotal:
  • On Sale
    PROX Piston Kit - 71.94 mm - Beta 01.7398.A

    PROX Piston Kit - 71.94 mm - Beta 01.7398.A

    PROX

    MSRP: $221.95
    Now: $170.00
    Was: $221.95
    When your piston fails, engine performance tanks—and so does your race day. The PROX Piston Kit delivers OEM-equivalent reliability with CNC precision, ensuring consistent compression, proper ring...
    09106807
    SKU:
    09106807
    Availability:
    Ships Same Business Day
    Weight:
    0.01 LBS
    MSRP: $221.95
    Now: $170.00
    Was: $221.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $221.95
    Now: $170.00
    Was: $221.95
    Subtotal:
  • On Sale
    PROX Friction Plate Set - KX450F/X 16.S44043

    PROX Friction Plate Set - KX450F/X 16.S44043

    PROX

    MSRP: $122.95
    Now: $102.00
    Was: $122.95
    A worn or slipping clutch directly impacts your KX450F/X's power delivery and rideability—and friction plates are the critical wear component that determines engagement quality. This...
    11313922
    SKU:
    11313922
    Availability:
    Ships Same Business Day
    Weight:
    0.77 LBS
    MSRP: $122.95
    Now: $102.00
    Was: $122.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $122.95
    Now: $102.00
    Was: $122.95
    Subtotal:
  • On Sale
    PROX Friction Plate Set - Gas Gas/Husqvarna/KTM 16.S51018

    PROX Friction Plate Set - Gas Gas/Husqvarna/KTM 16.S51018

    PROX

    MSRP: $88.95
    Now: $68.00
    Was: $88.95
    A worn or glazed clutch friction plate set will rob your bike of power delivery and responsiveness—especially critical in high-demand riding conditions. This PROX friction plate set is manufactured...
    11313923
    SKU:
    11313923
    Availability:
    Ships Same Business Day
    Weight:
    0.40 LBS
    MSRP: $88.95
    Now: $68.00
    Was: $88.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $88.95
    Now: $68.00
    Was: $88.95
    Subtotal:
  • On Sale
    PROX Clutch Basket - KX 250 17.4392F PROX Clutch Basket - KX 250 17.4392F

    PROX Clutch Basket - KX 250 17.4392F

    PROX

    MSRP: $299.95
    Now: $221.00
    Was: $299.95
    The stock clutch basket on your KX 250 will wear faster than your lap times improve. This PROX unit eliminates side-load wear and friction-induced heat through precision engineering and advanced...
    11321967
    SKU:
    11321967
    Availability:
    Ships Same Business Day
    Weight:
    1.62 LBS
    MSRP: $299.95
    Now: $221.00
    Was: $299.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $299.95
    Now: $221.00
    Was: $299.95
    Subtotal:
  • On Sale
    PROX Clutch Plate Set - Kawasaki/Suzuki 16.CPS41088 PROX Clutch Plate Set - Kawasaki/Suzuki 16.CPS41088

    PROX Clutch Plate Set - Kawasaki/Suzuki 16.CPS41088

    PROX

    MSRP: $105.95
    Now: $93.00
    Was: $105.95
    When you're pushing your bike to the limit, a slipping clutch will cost you races and reliability. The PROX Clutch Plate Set delivers OEM-level durability with enhanced performance features...
    11312561
    SKU:
    11312561
    Availability:
    Ships Same Business Day
    Weight:
    0.87 LBS
    MSRP: $105.95
    Now: $93.00
    Was: $105.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $105.95
    Now: $93.00
    Was: $105.95
    Subtotal:
  • On Sale
    PROX Clutch Pressure Plate - KTM/Honda/Husaberg 18.P1286

    PROX Clutch Pressure Plate - KTM/Honda/Husaberg 18.P1286

    PROX

    MSRP: $59.31
    Now: $42.00
    Was: $59.31
    A worn or damaged clutch pressure plate compromises engagement consistency and can lead to slippage, heat buildup, and premature wear on your entire clutch system. The PROX Clutch Pressure Plate...
    11311475
    SKU:
    11311475
    Availability:
    Ships Same Business Day
    Weight:
    0.34 LBS
    MSRP: $59.31
    Now: $42.00
    Was: $59.31
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $59.31
    Now: $42.00
    Was: $59.31
    Subtotal:
  • On Sale
    PROX Clutch Pressure Plate - Honda 18.P1392 PROX Clutch Pressure Plate - Honda 18.P1392

    PROX Clutch Pressure Plate - Honda 18.P1392

    PROX

    MSRP: $55.95
    Now: $42.00
    Was: $55.95
    A worn or failing clutch pressure plate compromises your ability to modulate power delivery and can lead to slippage under load—ultimately costing you consistency on track or reliability on the...
    11311479
    SKU:
    11311479
    Availability:
    Ships Same Business Day
    Weight:
    0.49 LBS
    MSRP: $55.95
    Now: $42.00
    Was: $55.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $55.95
    Now: $42.00
    Was: $55.95
    Subtotal:
  • On Sale
    PROX Clutch Plate Set - CRF 450R/X 16.CPS14002 PROX Clutch Plate Set - CRF 450R/X 16.CPS14002

    PROX Clutch Plate Set - CRF 450R/X 16.CPS14002

    PROX

    MSRP: $193.95
    Now: $170.00
    Was: $193.95
    A worn or slipping clutch compromises your control and throttle response when you need it most. The PROX Clutch Plate Set delivers complete OEM-quality friction and steel plates engineered with 10%...
    11312510
    SKU:
    11312510
    Availability:
    Ships Same Business Day
    Weight:
    2.05 LBS
    MSRP: $193.95
    Now: $170.00
    Was: $193.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $193.95
    Now: $170.00
    Was: $193.95
    Subtotal:
  • On Sale
    PROX Clutch Plate Set - YZ 125/X 16.CPS22093 PROX Clutch Plate Set - YZ 125/X 16.CPS22093

    PROX Clutch Plate Set - YZ 125/X 16.CPS22093

    PROX

    MSRP: $171.95
    Now: $144.00
    Was: $171.95
    If you're pushing your YZ 125/X to its limits, clutch slippage under load will cost you critical power delivery and control. This complete PROX Clutch Plate Set delivers the friction and steel plates...
    11312523
    SKU:
    11312523
    Availability:
    Ships Same Business Day
    Weight:
    1.74 LBS
    MSRP: $171.95
    Now: $144.00
    Was: $171.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $171.95
    Now: $144.00
    Was: $171.95
    Subtotal:
  • On Sale
    PROX Clutch Set - KTM/Beta/Polaris 16.CPS64006 PROX Clutch Set - KTM/Beta/Polaris 16.CPS64006

    PROX Clutch Set - KTM/Beta/Polaris 16.CPS64006

    PROX

    MSRP: $161.95
    Now: $119.00
    Was: $161.95
    A worn or slipping clutch robs you of the precision control and immediate throttle response your machine demands, especially under hard acceleration or extreme riding conditions. The PROX Clutch Set...
    11312582
    SKU:
    11312582
    Availability:
    Ships Same Business Day
    Weight:
    2.11 LBS
    MSRP: $161.95
    Now: $119.00
    Was: $161.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $161.95
    Now: $119.00
    Was: $161.95
    Subtotal:
  • On Sale
    PROX Clutch Plate Set - YZ 250F 16.CPS23115 PROX Clutch Plate Set - YZ 250F 16.CPS23115

    PROX Clutch Plate Set - YZ 250F 16.CPS23115

    PROX

    MSRP: $193.95
    Now: $158.00
    Was: $193.95
    Clutch slippage under hard acceleration kills performance and costs you races. This PROX Clutch Plate Set delivers the complete friction and steel plate package your YZ 250F needs to maintain crisp...
    11313625
    SKU:
    11313625
    Availability:
    Ships Same Business Day
    Weight:
    2.05 LBS
    MSRP: $193.95
    Now: $158.00
    Was: $193.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $193.95
    Now: $158.00
    Was: $193.95
    Subtotal:
  • On Sale
    PROX Cam Chain - T106ER - 110 Links - Gas Gas | Husqvarna | KTM 31.6356

    PROX Cam Chain - T106ER - 110 Links - Gas Gas | Husqvarna | KTM 31.6356

    PROX

    MSRP: $88.95
    Now: $72.00
    Was: $88.95
    A worn or failing cam chain compromises valve timing precision and can lead to catastrophic engine damage if it breaks during operation. The PROX T106ER delivers OEM-equivalent reliability with...
    09251201
    SKU:
    09251201
    Availability:
    Ships Same Business Day
    Weight:
    0.54 LBS
    MSRP: $88.95
    Now: $72.00
    Was: $88.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $88.95
    Now: $72.00
    Was: $88.95
    Subtotal:
  • On Sale
    PROX Cam Chain - 98XRH2010 - 114 Links - Yamaha 31.2414

    PROX Cam Chain - 98XRH2010 - 114 Links - Yamaha 31.2414

    PROX

    MSRP: $77.95
    Now: $64.00
    Was: $77.95
    A worn or damaged cam chain compromises valve timing precision and can lead to catastrophic engine failure. The PROX 98XRH2010 delivers OEM-spec reliability with enhanced durability through advanced...
    09250825
    SKU:
    09250825
    Availability:
    Ships Same Business Day
    Weight:
    0.45 LBS
    MSRP: $77.95
    Now: $64.00
    Was: $77.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $77.95
    Now: $64.00
    Was: $77.95
    Subtotal:
  • On Sale
    PROX Piston Kit - 85.00 mm - Polaris 01.5810.000 PROX Piston Kit - 85.00 mm - Polaris 01.5810.000

    PROX Piston Kit - 85.00 mm - Polaris 01.5810.000

    PROX

    MSRP: $119.95
    Now: $102.00
    Was: $119.95
    When your engine's pistons wear beyond serviceable limits, you need a replacement that matches OEM specifications without compromise. The PROX Piston Kit delivers Japanese-manufactured precision with...
    09105042
    SKU:
    09105042
    Availability:
    Ships Same Business Day
    Weight:
    1.50 LBS
    ENGINE TYPE:
    2-STROKE
    UNITS:
    KIT
    PRODUCT NAME:
    PISTON KIT
    RIDING STYLE:
    SNOW
    MSRP: $119.95
    Now: $102.00
    Was: $119.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $119.95
    Now: $102.00
    Was: $119.95
    Subtotal:
  • On Sale
    PROX Piston Kit 01.1408.200

    PROX Piston Kit 01.1408.200

    PROX

    MSRP: $185.95
    Now: $158.00
    Was: $185.95
    Worn or damaged pistons compromise engine efficiency, reliability, and performance—especially in high-stress racing applications. The PROX Piston Kit 011408200 restores your engine to OEM...
    09030821
    SKU:
    09030821
    Availability:
    Ships Same Business Day
    Weight:
    1.35 LBS
    RIDING STYLE:
    OFF-ROAD
    BORE SIZE METRIC:
    91.00 MM
    PISTON MATERIAL:
    ALUMINUM ALLOY
    PISTON SIZE METRIC:
    +2.00 MM
    TYPE:
    TOP END
    UNITS:
    EACH
    ENGINE TYPE:
    2-STROKE
    PRODUCT NAME:
    PISTON KIT
    MSRP: $185.95
    Now: $158.00
    Was: $185.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $185.95
    Now: $158.00
    Was: $185.95
    Subtotal:
  • On Sale
    PROX Exhaust Valve 28.1227-1

    PROX Exhaust Valve 28.1227-1

    PROX

    MSRP: $30.95
    Now: $25.00
    Was: $30.95
    A precision exhaust valve is critical to maintaining proper combustion chamber sealing and engine performance under high RPM and sustained heat cycles. OEM-specification exhaust valves like the PROX...
    09260668
    SKU:
    09260668
    Availability:
    Ships Same Business Day
    Weight:
    0.06 LBS
    UNITS:
    EACH
    MATERIAL:
    STEEL
    RIDING STYLE:
    OFF-ROAD
    APPLICATION:
    EXHAUST
    PRODUCT NAME:
    VALVE
    MSRP: $30.95
    Now: $25.00
    Was: $30.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $30.95
    Now: $25.00
    Was: $30.95
    Subtotal:
  • On Sale
    PROX Exhaust Valve 28.1407-1

    PROX Exhaust Valve 28.1407-1

    PROX

    MSRP: $44.95
    Now: $38.00
    Was: $44.95
    A precision exhaust valve is critical to your engine's breathing efficiency and longevity. The PROX 28.1407-1 delivers OEM-specification performance with tight tolerances and premium construction,...
    09260677
    SKU:
    09260677
    Availability:
    Ships Same Business Day
    Weight:
    0.09 LBS
    APPLICATION:
    EXHAUST
    PRODUCT NAME:
    VALVE
    MATERIAL:
    STEEL
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    EACH
    MSRP: $44.95
    Now: $38.00
    Was: $44.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $44.95
    Now: $38.00
    Was: $44.95
    Subtotal:
  • PROX Intake Valve and Spring Kit 28.SIS3338-2

    PROX Intake Valve and Spring Kit 28.SIS3338-2

    PROX

    $155.95
    If you're pushing your engine to the limit, OEM valve springs will eventually let you down—they simply aren't engineered for sustained high-RPM loads. The PROX Intake Valve and Spring Kit 28...
    09261461
    SKU:
    09261461
    Availability:
    Ships Same Business Day
    Weight:
    0.30 LBS
    APPLICATION:
    INTAKE
    PRODUCT NAME:
    SPRING KIT
    TYPE:
    VALVE
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    MATERIAL:
    TI-STEEL
    $155.95
    Qty in Cart: 0
    Quantity:
    Price:
    $155.95
    Subtotal:
  • PROX Valve and Spring Kit 28.SIS4341-2

    PROX Valve and Spring Kit 28.SIS4341-2

    PROX

    $155.95
    If you're running your engine hard at high RPM, OEM valve and spring components become a limiting factor—they simply weren't engineered to handle sustained extreme conditions. The PROX 28.SIS4341-2...
    09261465
    SKU:
    09261465
    Availability:
    Ships Same Business Day
    Weight:
    0.35 LBS
    APPLICATION:
    INTAKE
    PRODUCT NAME:
    SPRING KIT
    TYPE:
    VALVE
    MATERIAL:
    STEEL
    RIDING STYLE:
    OFF-ROAD
    UNITS:
    KIT
    $155.95
    Qty in Cart: 0
    Quantity:
    Price:
    $155.95
    Subtotal:
  • PROX Valve and Spring Kit 28.SES3406-1

    PROX Valve and Spring Kit 28.SES3406-1

    PROX

    $139.95
    If you're pushing your engine to the limits, OEM valves and springs will become your bottleneck. The PROX 28.SES3406-1 Kit replaces them with nitrided steel valves and premium chrome vanadium springs...
    09261428
    SKU:
    09261428
    Availability:
    Ships Same Business Day
    Weight:
    0.22 LBS
    MATERIAL:
    STEEL
    APPLICATION:
    EXHAUST
    TYPE:
    VALVE
    PRODUCT NAME:
    SPRING KIT
    RIDING STYLE:
    ATV
    UNITS:
    KIT
    Qty in Cart: 0
    Quantity:
    Price:
    $139.95
    Subtotal:
  • PROX Top End Gasket Set - Yamaha 35.2418

    PROX Top End Gasket Set - Yamaha 35.2418

    PROX

    $69.95
    A quality top-end gasket set is essential for maintaining compression integrity and preventing costly oil leaks between cylinder head and block surfaces. PROX's gasket sets are engineered to OEM...
    09345708
    SKU:
    09345708
    Availability:
    Ships Same Business Day
    Weight:
    0.25 LBS
    PRODUCT NAME:
    GASKET SET
    TYPE:
    TOP END
    UNITS:
    SET
    RIDING STYLE:
    OFF-ROAD
    Qty in Cart: 0
    Quantity:
    Price:
    $69.95
    Subtotal:
  • PROX Top End Gasket Set - Suzuki 35.3122

    PROX Top End Gasket Set - Suzuki 35.3122

    PROX

    $22.95
    A quality top end gasket set is critical for maintaining compression, preventing oil leaks, and ensuring reliable engine sealing in high-performance applications. The PROX 35.3122 delivers...
    09345717
    SKU:
    09345717
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    UNITS:
    SET
    PRODUCT NAME:
    GASKET SET
    TYPE:
    TOP END
    RIDING STYLE:
    OFF-ROAD
    $22.95
    Qty in Cart: 0
    Quantity:
    Price:
    $22.95
    Subtotal:
  • PROX Top End Gasket Set - Suzuki 35.3311

    PROX Top End Gasket Set - Suzuki 35.3311

    PROX

    $34.95
    A top-end gasket set is essential maintenance for any engine rebuild or head service—it's the barrier that prevents combustion pressure and coolant from leaking past critical sealing points. The PROX...
    09345728
    SKU:
    09345728
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    PRODUCT NAME:
    GASKET SET
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    SET
    Qty in Cart: 0
    Quantity:
    Price:
    $34.95
    Subtotal:
  • On Sale
    PROX Top End Gasket Set - Suzuki 35.3337

    PROX Top End Gasket Set - Suzuki 35.3337

    PROX

    MSRP: $69.95
    Now: $45.00
    Was: $69.95
    A degraded top end gasket set compromises seal integrity, leading to coolant leaks, oil seepage, and potential engine damage. PROX gaskets are engineered to OEM specifications, ensuring reliable...
    09345737
    SKU:
    09345737
    Availability:
    Ships Same Business Day
    Weight:
    0.10 LBS
    PRODUCT NAME:
    GASKET SET
    RIDING STYLE:
    OFF-ROAD
    TYPE:
    TOP END
    UNITS:
    SET
    MSRP: $69.95
    Now: $45.00
    Was: $69.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $69.95
    Now: $45.00
    Was: $69.95
    Subtotal:
  • Total: items /

Adding your products to cart

Big Power, Nice Sound!

Picked up a Pro Circuit pipe and silencer for my YZ125 it’s a game changer. The power feels way better and the sound is awesome.

Tyler D. - 06/12

Perfect Fit

First time ordering here and dang y’all knocked it outta the park! The wheels fit my Ranger UTV perfect, and I’ll definitely be back for more 5 stars all day!

Sarah L. - 08/24

Fast Shipping!!

Ordered on a Monday, and it was on my doorstep by Wednesday! Super impressed with how fast the shipping was.

Jason P. - 09/13

Helps keep cool, works great!

Bought the dual pass Allstar radiator for my build, and it’s been solid. Keeps the engine running cool even on the hottest days no complaints here!

Jake M. - 05/21

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