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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- Price
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On Sale
PROX Crankshaft Bearing/Seal Kit - Beta 23.CBS73022
PROX
MSRP: $123.95Now: $99.00Was: $123.95Crankshaft bearing and seal failure doesn't just sideline your engine—it can cause catastrophic internal damage that costs thousands to repair. The PROX Crankshaft Bearing/Seal Kit (Beta 23.CBS73022)...09240712- SKU:
- 09240712
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $123.95Now: $99.00Was: $123.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Beta 23.CBS73050
PROX
MSRP: $106.95Now: $85.00Was: $106.95A crankshaft bearing and seal failure can sideline your engine when you can least afford it. The PROX 23.CBS73050 kit delivers OEM-spec replacement bearings and seals manufactured to exact factory...09240713- SKU:
- 09240713
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
MSRP: $106.95Now: $85.00Was: $106.95 -
On Sale
PROX Water Pump Rebuild Kit - Honda 57.1417
PROX
MSRP: $57.95Now: $47.00Was: $57.95Water pump failure can sideline your Honda when you need it most, leaving you stranded with expensive downtime and potential engine damage. The PROX 57.1417 Rebuild Kit delivers a complete,...09347755- SKU:
- 09347755
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Water Pump Rebuild Kit - Kawasaki 57.4327
PROX
MSRP: $57.95Now: $47.00Was: $57.95Water pump failure can sideline your Kawasaki mid-season, but a full rebuild extends component life and restores cooling system reliability without replacing the entire assembly. This PROX kit...09347756- SKU:
- 09347756
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Water Pump Rebuild Kit - Husqvarna/KTM 57.6327
PROX
MSRP: $46.95Now: $38.00Was: $46.95A failing water pump doesn't just compromise cooling efficiency—it puts your entire engine at risk. The PROX Water Pump Rebuild Kit for Husqvarna and KTM machines gives you a complete, cost-effective...09347757- SKU:
- 09347757
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
MSRP: $46.95Now: $38.00Was: $46.95 -
On Sale
PROX Water Pump Rebuild Kit - KTM 57.6407
PROX
MSRP: $41.95Now: $34.00Was: $41.95A failing water pump can leave you stranded mid-race or trail, compromising engine cooling when you need it most. This PROX rebuild kit restores your water pump to OEM specifications without the cost...09347758- SKU:
- 09347758
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Water Pump Rebuild Kit - Husqvarna/KTM 57.6416
PROX
MSRP: $67.95Now: $55.00Was: $67.95A failing water pump can spell disaster for your engine—overheating, catastrophic damage, and expensive downtime. The PROX Water Pump Rebuild Kit gives you a straightforward way to restore cooling...09347759- SKU:
- 09347759
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $67.95Now: $55.00Was: $67.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1352
PROX
MSRP: $93.95Now: $76.00Was: $93.95A top-end rebuild demands precision sealing—any leak compromises compression and power output. The PROX 35.1352 Gasket Set delivers complete coverage for Honda applications, engineered to OEM...09347760- SKU:
- 09347760
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1421
PROX
MSRP: $93.95Now: $76.00Was: $93.95A top-end rebuild demands precision sealing—any leak or gasket failure undermines engine reliability and performance. The PROX 35.1421 gasket set delivers OEM-grade sealing surfaces manufactured to...09347761- SKU:
- 09347761
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1423
PROX
MSRP: $93.95Now: $76.00Was: $93.95A degraded top-end gasket set compromises compression, invites oil seepage, and forces your engine to work harder than it should. The PROX 35.1423 delivers complete sealing integrity across all...09347762- SKU:
- 09347762
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2232
PROX
MSRP: $30.95Now: $25.00Was: $30.95A top-end rebuild demands precision sealing—any leak compromises performance and invites catastrophic engine damage. The PROX 35.2232 gasket set delivers OEM-grade sealing surfaces across your entire...09347763- SKU:
- 09347763
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
MSRP: $30.95Now: $25.00Was: $30.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2450
PROX
MSRP: $72.95Now: $59.00Was: $72.95A top-end rebuild demands precision—gasket failure introduces oil leaks, compression loss, and costly engine damage. The PROX 35.2450 Top End Gasket Set delivers the complete complement of OEM-spec...09347764- SKU:
- 09347764
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $72.95Now: $59.00Was: $72.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2453
PROX
MSRP: $88.95Now: $72.00Was: $88.95A top-end rebuild demands precision sealing—any leak or gasket failure compromises compression and performance. The PROX Top End Gasket Set delivers OEM-equivalent quality at a fraction of the cost,...09347765- SKU:
- 09347765
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2718
PROX
MSRP: $120.95Now: $98.00Was: $120.95A compromised top-end gasket set is one of the quickest ways to lose compression, leak oil, and watch your rebuild efforts go to waste. The PROX 35.2718 gasket set for Yamaha engines delivers...09347766- SKU:
- 09347766
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $120.95Now: $98.00Was: $120.95 -
On Sale
PROX Top End Gasket Set - Suzuki 35.3349
PROX
MSRP: $72.95Now: $59.00Was: $72.95A top-end rebuild demands precision sealing—any leak or gap compromises combustion efficiency and reliability. The PROX Top End Gasket Set for Suzuki engines delivers OEM-grade sealing with ProX's...09347767- SKU:
- 09347767
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $72.95Now: $59.00Was: $72.95 -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4350
PROX
MSRP: $78.95Now: $64.00Was: $78.95A top-end rebuild demands precision sealing—any leak compromises compression, power delivery, and engine longevity. The PROX Top End Gasket Set delivers OEM-equivalent sealing performance with...09347768- SKU:
- 09347768
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $78.95Now: $64.00Was: $78.95 -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4431
PROX
MSRP: $99.95Now: $81.00Was: $99.95A failed top-end gasket can compromise compression, cause oil seepage, and force an incomplete rebuild. The PROX 35.4431 gasket set delivers precision-engineered components that seal reliably and...09347770- SKU:
- 09347770
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6320
PROX
MSRP: $57.95Now: $47.00Was: $57.95A leaking or degraded top-end gasket set compromises compression, fuel efficiency, and overall engine reliability. Whether you're rebuilding after high-mileage wear or freshening an engine for peak...09347771- SKU:
- 09347771
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Husqvarna/KTM 35.6347
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end gasket set is non-negotiable for any serious rebuild—compromised sealing leads to compression loss, oil leakage, and catastrophic engine failure. The PROX 35.6347 delivers OEM-quality...09347773- SKU:
- 09347773
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6350
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end rebuild demands precision sealing—any leak compromises compression, throttle response, and overall engine efficiency. The PROX Top End Gasket Set delivers OEM-grade materials and exact...09347774- SKU:
- 09347774
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna 35.6353
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end rebuild demands precision sealing—any compromise in gasket quality directly impacts compression, performance, and engine longevity. The PROX Top End Gasket Set is manufactured to strict...09347775- SKU:
- 09347775
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6419
PROX
MSRP: $99.95Now: $81.00Was: $99.95A top-end rebuild demands precision sealing—any leak or failure compromises combustion efficiency and engine reliability. The PROX Top End Gasket Set delivers OEM-equivalent sealing without the OEM...09347776- SKU:
- 09347776
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7218
PROX
MSRP: $51.95Now: $42.00Was: $51.95A failed top-end gasket compromises compression, invites coolant and oil leaks, and tanks engine performance—especially critical if you're pushing your Beta hard on the track or trail. The PROX Top...09347778- SKU:
- 09347778
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7219
PROX
MSRP: $51.95Now: $42.00Was: $51.95A top-end rebuild demands precision sealing—any leak compromises compression, performance, and reliability. The PROX Top End Gasket Set delivers OEM-equivalent quality through factory-controlled...09347780- SKU:
- 09347780
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7220
PROX
MSRP: $51.95Now: $42.00Was: $51.95A top-end rebuild demands gasket integrity that won't compromise your engine's sealing surfaces or performance gains. The PROX Top End Gasket Set delivers OEM-equivalent quality without the premium...09347781- SKU:
- 09347781
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7313
PROX
MSRP: $62.95Now: $51.00Was: $62.95A compromised top-end gasket set will leak compression, rob horsepower, and leave you stranded. The PROX 35.7313 delivers the complete gasket set you need for a proper rebuild, engineered to seal...09347782- SKU:
- 09347782
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Sherco 35.7314
PROX
MSRP: $88.95Now: $72.00Was: $88.95A leaking or worn top-end gasket set will compromise your Sherco's compression, throttle response, and overall reliability—especially critical if you're running lean jetting or pushing higher RPMs...09347783- SKU:
- 09347783
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7322
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision sealing—any leak or gasket failure can compromise compression, reduce power output, and lead to costly engine damage. The PROX Top End Gasket Set delivers...09347784- SKU:
- 09347784
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7323
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision-fit gaskets that seal reliably under extreme combustion pressures and temperature cycling. The PROX Top End Gasket Set delivers factory-spec tolerances and...09347785- SKU:
- 09347785
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Sherco 35.7324
PROX
MSRP: $99.95Now: $81.00Was: $99.95A degraded top-end gasket set compromises engine sealing, reducing compression and inviting coolant or oil seepage that can sideline your Sherco mid-season. The PROX 35.7324 delivers OEM-grade...09347786- SKU:
- 09347786
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7332
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision sealing—any leak compromises compression, power delivery, and engine longevity. The PROX Top End Gasket Set delivers OEM-quality sealing with factory...09347787- SKU:
- 09347787
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95Qty in Cart: 0Quantity:Price:MSRP: $62.95Now: $51.00Was: $62.95Subtotal: -
On Sale
PROX Top End Gasket Set - Beta 35.7351
PROX
MSRP: $130.95Now: $106.00Was: $130.95A degraded top-end gasket set compromises compression, invites oil leakage, and forces you into unnecessary downtime. The PROX 35.7351 delivers OEM-equivalent sealing across all critical junctions,...09347788- SKU:
- 09347788
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7360
PROX
MSRP: $130.95Now: $106.00Was: $130.95A top-end rebuild demands precision—and this gasket set delivers the sealing integrity your engine needs to perform reliably under race conditions or high-demand use. ProX engineered each gasket to...09347789- SKU:
- 09347789
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7416
PROX
MSRP: $130.95Now: $106.00Was: $130.95A top-end rebuild demands precision sealing—any compromise risks compression loss, coolant seepage, and catastrophic engine failure. The PROX Top End Gasket Set (35.7416) delivers OEM-quality...09347790- SKU:
- 09347790
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7420
PROX
MSRP: $130.95Now: $106.00Was: $130.95A compromised top-end gasket set will cost you power, reliability, and eventually, engine damage. The PROX Top End Gasket Set (35.7420) delivers the precision sealing your Beta engine needs to...09347791- SKU:
- 09347791
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7426
PROX
MSRP: $130.95Now: $106.00Was: $130.95A worn top-end gasket set compromises combustion sealing, leading to compression loss and decreased power output. The PROX 35.7426 restores proper sealing integrity across your top-end, ensuring...09347792- SKU:
- 09347792
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7430
PROX
MSRP: $130.95Now: $106.00Was: $130.95When you're rebuilding your Beta's top end, a failed gasket means catastrophic oil loss, coolant leaks, and potential engine damage—none of which you can afford mid-season. The PROX Top End Gasket...09347793- SKU:
- 09347793
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Piston Kit - 78.97 mm - Honda CRF250R/CRF250RX 01.1350.A
PROX
MSRP: $188.95Now: $158.00Was: $188.95A worn or damaged piston compromises engine compression, throttle response, and overall reliability—especially critical in a high-revving 250cc four-stroke. The PROX Piston Kit delivers...09106779- SKU:
- 09106779
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
MSRP: $188.95Now: $158.00Was: $188.95 -
On Sale
PROX Piston Kit - 53.95 mm - Yamaha YZ125/YZ125X 01.2232.A
PROX
MSRP: $121.95Now: $90.00Was: $121.95A worn or damaged piston directly compromises your YZ125/YZ125X's power delivery, compression, and engine reliability. The PROX 53.95 mm Piston Kit restores your engine to OEM performance...09106780- SKU:
- 09106780
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $121.95Now: $90.00Was: $121.95 -
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: $210.95
