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!
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On Sale
PROX Piston Kit - 96.95 mm - Yamaha WR450F/YZ450F/YZ450FX 01.2448.A
PROX
MSRP: $210.95Now: $167.00Was: $210.95When your Yamaha WR450F or YZ450F demands more from its engine, a quality piston kit is non-negotiable. This PROX kit delivers precision-machined components engineered to exact OEM specifications,...09106781- SKU:
- 09106781
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $210.95Now: $167.00Was: $210.95Qty in Cart: 0Quantity:Price:MSRP: $210.95Now: $167.00Was: $210.95Subtotal: -
On Sale
PROX Piston Kit - 96.95 mm - Yamaha WR450F/YZ450F/YZ450FX 01.2450.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A piston kit is one of the most critical components in your engine's combustion chamber—it directly impacts power delivery, reliability, and longevity. The PROX 96.95 mm kit for your...09106782- SKU:
- 09106782
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $221.95Now: $183.00Was: $221.95Qty in Cart: 0Quantity:Price:MSRP: $221.95Now: $183.00Was: $221.95Subtotal: -
On Sale
PROX Piston Kit - 96.95 mm - Yamaha WR450F/YZ450F/YZ450FX 01.2453.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A worn or damaged piston directly impacts your WR450F or YZ450F's compression ratio, throttle response, and overall reliability—especially under high-RPM racing conditions. This PROX piston kit...09106783- SKU:
- 09106783
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Piston Kit - 85.95 mm - Yamaha 01.2918.A
PROX
MSRP: $188.95Now: $153.00Was: $188.95When your engine demands precision and reliability, settling for substandard pistons isn't an option. The PROX Piston Kit delivers OEM-grade quality with CNC-machined components engineered to exact...09106784- SKU:
- 09106784
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
MSRP: $188.95Now: $153.00Was: $188.95 -
On Sale
PROX Piston Kit - 92.94 mm - Yamaha Wolverine RMAX2/RMAX4 01.2921.A
PROX
MSRP: $177.95Now: $136.00Was: $177.95Engine rebuilds demand precision—and settling for inferior pistons compromises reliability and performance. The PROX Piston Kit delivers OEM-grade quality with CNC-machined accuracy, ensuring proper...09106785- SKU:
- 09106785
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $177.95Now: $136.00Was: $177.95 -
On Sale
PROX Piston Kit - 77.96 mm - Kawasaki KX250/KX250X 01.4353.A
PROX
MSRP: $188.95Now: $158.00Was: $188.95The piston is the heart of your engine's combustion cycle—wear, scoring, or improper tolerances kill power and reliability. This PROX kit delivers OEM-equivalent precision for the Kawasaki...09106787- SKU:
- 09106787
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $188.95Now: $158.00Was: $188.95 -
On Sale
PROX Piston Kit - 99.91 mm - Sea Doo GTX300/RXP300/RXT300 01.5596.A
PROX
MSRP: $216.95Now: $183.00Was: $216.95A worn or damaged piston directly compromises combustion efficiency, power delivery, and engine longevity on your Sea Doo. The PROX Piston Kit delivers OEM-equivalent precision with CNC-machined...09106788- SKU:
- 09106788
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
MSRP: $216.95Now: $183.00Was: $216.95 -
On Sale
PROX Piston Kit - 79.95 mm - Polaris 01.5806.A
PROX
MSRP: $138.95Now: $115.00Was: $138.95A worn or damaged piston directly undermines engine performance, compression, and reliability—making a quality replacement essential for any serious rebuild or repair. The PROX Piston Kit delivers...09106789- SKU:
- 09106789
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $138.95Now: $115.00Was: $138.95 -
On Sale
PROX Piston Kit - 92.95 mm - Polaris 01.5913.A
PROX
MSRP: $143.95Now: $115.00Was: $143.95A precision piston kit is essential for maintaining peak engine performance and reliability in your Polaris build. This PROX kit delivers OEM-quality construction with CNC-machined components,...09106790- SKU:
- 09106790
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $143.95Now: $115.00Was: $143.95 -
On Sale
PROX Piston Kit - 92.91 mm - Polaris RZR XP Turbo 01.5920.A
PROX
MSRP: $210.95Now: $167.00Was: $210.95Your RZR XP Turbo's engine demands precision components that can handle the demands of high-output performance. This PROX Piston Kit delivers OEM-grade quality with CNC-precision manufacturing,...09106791- SKU:
- 09106791
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $210.95Now: $167.00Was: $210.95 -
On Sale
PROX Piston Kit - 57.94 mm - Husqvarna TE150i | KTM 150EXC TPI 01.6241.A
PROX
MSRP: $139.95Now: $119.00Was: $139.95A worn or damaged piston directly compromises engine compression, throttle response, and overall reliability—especially critical on high-revving 150cc two-stroke engines. The PROX 57.94 mm Piston Kit...09106792- SKU:
- 09106792
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $139.95Now: $119.00Was: $139.95 -
On Sale
PROX Steel Plate Set - Gas Gas/Husqvarna/KTM 16.S50013
PROX
MSRP: $27.95Now: $22.00Was: $27.95Clutch plate wear is one of the fastest paths to power loss and unpredictable engagement in high-performance dirt bikes. The PROX Steel Plate Set delivers OEM-exact specifications, ensuring...11313932- SKU:
- 11313932
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $27.95Now: $22.00Was: $27.95 -
On Sale
PROX Steel Plate Set - Husqvarna/KTM 16.S51012
PROX
MSRP: $27.95Now: $22.00Was: $27.95Clutch plate wear is inevitable in high-demand riding, and degraded plates compromise both power delivery and rider safety. The PROX Steel Plate Set delivers OEM-spec friction surfaces that restore...11313933- SKU:
- 11313933
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $27.95Now: $22.00Was: $27.95 -
On Sale
PROX Steel Plate Set - Gas Gas/Husqvarna/KTM 16.S51019
PROX
MSRP: $56.95Now: $42.00Was: $56.95Clutch fade and slippage compromise acceleration and reliability—especially under demanding track or trail conditions. This ProX steel plate set is engineered to OEM specifications, ensuring...11313934- SKU:
- 11313934
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $56.95Now: $42.00Was: $56.95 -
On Sale
PROX Steel Plate Set - Gas Gas/Husqvarna/KTM 16.S53010
PROX
MSRP: $45.95Now: $34.00Was: $45.95Worn or glazed clutch plates rob you of engagement precision and consistent power delivery—especially critical in high-performance riding where clutch modulation separates clean shifts from sloppy...11313935- SKU:
- 11313935
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $45.95Now: $34.00Was: $45.95 -
On Sale
PROX Steel Plate Set - 125 SE-R 16.S71018
PROX
MSRP: $69.95Now: $56.00Was: $69.95A worn or damaged clutch plate set directly impacts your 125 SE-R's engagement precision and overall reliability. This OEM-spec steel plate set restores factory performance characteristics, ensuring...11313936- SKU:
- 11313936
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $69.95Now: $56.00Was: $69.95 -
On Sale
PROX Steel Plate Set - Sherco 16.S73018
PROX
MSRP: $78.95Now: $64.00Was: $78.95Clutch plate wear is inevitable, but downtime isn't. The PROX Steel Plate Set for Sherco 16.S73018 delivers OEM-specification performance when you need a complete replacement or are rebuilding your...11313937- SKU:
- 11313937
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $78.95Now: $64.00Was: $78.95 -
On Sale
PROX Piston Kit - 87.96 mm - Gas Gas | Husqvarna | KTM 01.6353.A
PROX
MSRP: $209.95Now: $195.00Was: $229.73Whether you're rebuilding a top-end after a hard race season or restoring a two-stroke to factory specifications, a precision piston kit is non-negotiable. The PROX 87.96 mm Piston Kit delivers...09106793- SKU:
- 09106793
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $209.95Now: $195.00Was: $229.73 -
On Sale
PROX Piston Kit - 94.95 mm - Gas Gas | Husqvarna | KTM 01.6434.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A worn or damaged piston directly compromises engine compression, power delivery, and reliability—especially critical in high-demand 2-stroke applications. The PROX Piston Kit delivers OEM-grade...09106794- SKU:
- 09106794
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $221.95Now: $183.00Was: $221.95Qty in Cart: 0Quantity:Price:MSRP: $221.95Now: $183.00Was: $221.95Subtotal: -
On Sale
PROX Piston Kit - 94.95 mm - Husqvarna FE450 | KTM 450EXC-F 01.6440.A
PROX
MSRP: $221.95Now: $167.00Was: $221.95The piston is the heart of your engine's combustion process, and a worn or damaged unit directly compromises power delivery, fuel efficiency, and reliability. This PROX kit delivers OEM-quality...09106795- SKU:
- 09106795
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $221.95Now: $167.00Was: $221.95 -
On Sale
PROX Piston Kit - 94.96 mm - Gas Gas | Husqvarna | KTM 01.6443.A
PROX
MSRP: $214.95Now: $183.00Was: $214.95Engine wear demands precision replacement, and OEM-equivalent pistons are non-negotiable for maintaining compression, power delivery, and reliability. The PROX 94.96 mm piston kit delivers...09106796- SKU:
- 09106796
- Availability:
- Ships Same Business Day
- Weight:
- 0.83 LBS
MSRP: $214.95Now: $183.00Was: $214.95 -
On Sale
PROX Piston Kit - 94.95 mm - Gas Gas | Husqvarna | KTM 01.6513.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A worn or damaged piston directly impacts combustion efficiency, throttle response, and overall engine longevity—making a quality replacement essential for maintaining peak performance. The PROX 94...09106797- SKU:
- 09106797
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Piston Kit - 66.34 mm - Beta RR250/Xtrainer 250 01.7313.A
PROX
MSRP: $159.95Now: $136.00Was: $159.95When your Beta RR250 or Xtrainer 250 demands a fresh top-end rebuild, settling for substandard pistons compromises both reliability and performance. This PROX piston kit delivers OEM-quality...09106798- SKU:
- 09106798
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
MSRP: $159.95Now: $136.00Was: $159.95 -
On Sale
PROX Piston Kit - 75.96 mm - Sherco 250SE-F/250SEF-R 01.7314.A
PROX
MSRP: $209.99Now: $178.00Was: $209.99Your Sherco 250SE engine demands precision components that match OEM specifications without compromise. This PROX piston kit delivers CNC-machined accuracy and OEM-spec rings in a complete assembly,...09106799- SKU:
- 09106799
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $209.99Now: $178.00Was: $209.99 -
On Sale
PROX Piston Kit - 83.95 mm - Sherco 300SE-F/300SEF-R 01.7324.A
PROX
MSRP: $221.95Now: $178.00Was: $221.95Your Sherco 300SE-F/300SEF-R demands precision internals that can withstand the demands of high-RPM racing and aggressive trail riding. This PROX piston kit delivers OEM-quality components engineered...09106800- SKU:
- 09106800
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $221.95Now: $178.00Was: $221.95 -
On Sale
PROX Piston Kit - 66.34 mm - Sherco 250SE/250SE-R 01.7334.A
PROX
MSRP: $166.95Now: $136.00Was: $166.95When your Sherco 250SE/250SE-R's piston begins to show wear, power delivery suffers and reliability becomes uncertain. This PROX piston kit restores your engine to OEM performance standards with...09106801- SKU:
- 09106801
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $166.95Now: $136.00Was: $166.95 -
On Sale
PROX Piston Kit - 66.34 mm - Sherco 250SE/250SE-R 01.7337.A
PROX
MSRP: $166.95Now: $136.00Was: $166.95When your Sherco 250SE or 250SE-R piston shows wear, compression loss and power degradation follow. This PROX piston kit restores factory performance and reliability with precision engineering,...09106802- SKU:
- 09106802
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $166.95Now: $136.00Was: $166.95 -
On Sale
PROX Piston Kit - 71.94 mm - Sherco 300SE/300SE-R 01.7346.A
PROX
MSRP: $221.95Now: $170.00Was: $221.95A worn or damaged piston directly compromises combustion efficiency, power delivery, and engine longevity in your Sherco 300SE/300SE-R. This PROX piston kit restores factory performance with...09106803- SKU:
- 09106803
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $221.95Now: $170.00Was: $221.95 -
On Sale
PROX Piston Kit - 87.96 mm - Beta 350RR 01.7351.A
PROX
MSRP: $221.95Now: $178.00Was: $221.95Engine wear compromises power delivery and reliability—a quality piston kit restores your Beta 350RR to factory specifications and beyond. This PROX kit delivers OEM-grade precision with a complete...09106804- SKU:
- 09106804
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
MSRP: $221.95Now: $178.00Was: $221.95 -
On Sale
PROX Piston Kit - 87.96 mm - Beta 350RR 01.7355.A
PROX
MSRP: $221.95Now: $178.00Was: $221.95When your Beta 350RR demands peak performance, a worn or suboptimal piston compromises both power delivery and engine longevity. The PROX Piston Kit delivers precision-engineered components that...09106805- SKU:
- 09106805
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
MSRP: $221.95Now: $178.00Was: $221.95 -
On Sale
PROX Piston Kit - 87.96 mm - Beta 390RR 01.7365.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A piston kit is the heart of your engine's combustion cycle—worn or damaged pistons directly compromise compression, power output, and engine longevity. The PROX 87.96 mm kit for the Beta 390RR...09106806- SKU:
- 09106806
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Piston Kit - 94.95 mm - Beta 400RR 01.7411.A
PROX
MSRP: $216.95Now: $183.00Was: $216.95A worn or damaged piston directly compromises engine compression, throttle response, and reliability—especially critical in a high-revving 400cc dirt bike where every fraction of performance matters...09106808- SKU:
- 09106808
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $216.95Now: $183.00Was: $216.95 -
On Sale
PROX Piston Kit - 94.95 mm - Beta 450RR 01.7412.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95Your Beta 450RR's engine demands precision at every combustion cycle—and that starts with a piston kit engineered to exact OEM specifications. The PROX 94.95 mm kit delivers the durability and...09106809- SKU:
- 09106809
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Piston Kit - 94.96 mm - Beta 430RR 01.7415.A
PROX
MSRP: $216.95Now: $183.00Was: $216.95A worn or damaged piston directly compromises engine compression, throttle response, and overall reliability—especially critical in high-performance 430RR applications where precision tolerances are...09106811- SKU:
- 09106811
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $216.95Now: $183.00Was: $216.95 -
On Sale
PROX Piston Kit - 99.96 mm - Beta 480RR 01.7425.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95A worn or damaged piston directly impacts engine compression, throttle response, and reliability—especially critical in high-revving two-stroke applications like the Beta 480RR. This PROX piston kit...09106812- SKU:
- 09106812
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Piston Kit - 99.95 mm - Beta 498RR/520RR 01.7512.A
PROX
MSRP: $221.95Now: $183.00Was: $221.95The piston is the heart of your engine's combustion cycle, and worn or damaged pistons will kill performance and reliability. This PROX kit gives you OEM-quality components precision-engineered for...09106813- SKU:
- 09106813
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
MSRP: $221.95Now: $183.00Was: $221.95 -
On Sale
PROX Inner Clutch Hub - CRF250R/RX 18.1348
PROX
MSRP: $93.95Now: $76.00Was: $93.95The inner clutch hub is a critical wear component that directly impacts your CRF250R/RX's power delivery and throttle response. A worn or damaged hub causes slippage, delayed engagement, and...11321867- SKU:
- 11321867
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Inner Clutch Hub - CRF450X 18.1405
PROX
MSRP: $82.95Now: $68.00Was: $82.95A worn or damaged inner clutch hub compromises power delivery and creates unpredictable engagement, directly impacting your lap times and ride quality. The PROX Inner Clutch Hub for the CRF450X is...11321868- SKU:
- 11321868
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
MSRP: $82.95Now: $68.00Was: $82.95 -
On Sale
PROX Inner Clutch Hub - CRF450R 18.1413
PROX
MSRP: $93.95Now: $76.00Was: $93.95If your CRF450R's clutch engagement feels inconsistent or your shifts are becoming notchy, a worn inner clutch hub is often the culprit. The PROX 18.1413 is a precision-cast, OEM-specification...11321869- SKU:
- 11321869
- Availability:
- Ships Same Business Day
- Weight:
- 0.89 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Inner Clutch Hub - CRF450L/R/X/RX 18.1417
PROX
MSRP: $89.95Now: $76.00Was: $89.95A worn or damaged inner clutch hub compromises power delivery and creates unpredictable engagement in your CRF450. The PROX 18.1417 restores OEM-spec performance with precision-cast construction,...11321870- SKU:
- 11321870
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
MSRP: $89.95Now: $76.00Was: $89.95
