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 Gasket Kit - Complete - Suzuki 34.3316
PROX
MSRP: $120.95Now: $98.00Was: $120.95A complete engine rebuild demands precision sealing—and compromising on gasket quality invites oil leaks, compression loss, and catastrophic failure. The PROX Gasket Kit 34.3316 consolidates every...09345576- SKU:
- 09345576
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $120.95Now: $98.00Was: $120.95Qty in Cart: 0Quantity:Price:MSRP: $120.95Now: $98.00Was: $120.95Subtotal: -
On Sale
PROX Top End Gasket Set - Kawasaki KX 450 F 35.4419
PROX
MSRP: $93.95Now: $76.00Was: $93.95A top-end rebuild demands precision gaskets that won't fail under combustion pressures and extreme heat cycles. The PROX Top End Gasket Set eliminates the risk of compression leaks and coolant...09345771- SKU:
- 09345771
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1348
PROX
MSRP: $84.95Now: $72.00Was: $84.95A failing top-end gasket set will compromise cylinder head sealing, leading to coolant leaks, oil seepage, and lost compression—all of which degrade engine performance and reliability. The PROX 35...09347108- SKU:
- 09347108
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $84.95Now: $72.00Was: $84.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1386
PROX
MSRP: $41.95Now: $34.00Was: $41.95A top-end rebuild demands gasket integrity—compromised seals mean oil leaks, compression loss, and potential engine damage. The PROX 35.1386 gasket set delivers precision-engineered components...09347109- SKU:
- 09347109
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1419
PROX
MSRP: $84.95Now: $72.00Was: $84.95A top-end rebuild demands gaskets that won't fail under combustion pressures and thermal cycling. The PROX 35.1419 delivers precision-engineered sealing surfaces using premium materials, ensuring...09347111- SKU:
- 09347111
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $84.95Now: $72.00Was: $84.95Qty in Cart: 0Quantity:Price:MSRP: $84.95Now: $72.00Was: $84.95Subtotal: -
On Sale
PROX Top End Gasket Set - Honda TRX350 Rancher TM 35.1480
PROX
MSRP: $64.95Now: $55.00Was: $64.95A top-end rebuild demands precision gaskets that won't fail under pressure—PROX delivers exactly that with engineered components designed specifically for your Honda TRX350 Rancher. Factory gaskets...09347112- SKU:
- 09347112
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $64.95Now: $55.00Was: $64.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1498
PROX
MSRP: $67.95Now: $55.00Was: $67.95A top-end rebuild demands precision sealing—any leak compromises compression, efficiency, and engine longevity. The PROX 35.1498 gasket set delivers OEM-equivalent fitment and material quality,...09347115- SKU:
- 09347115
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $67.95Now: $55.00Was: $67.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1499
PROX
MSRP: $41.95Now: $34.00Was: $41.95A top-end rebuild demands precision—and contaminated or degraded gaskets will undermine even the most meticulous machine work. The PROX Top End Gasket Set delivers OEM-quality sealing across all...09347116- SKU:
- 09347116
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Top End Gasket Set - Honda XR650L 35.1623
PROX
MSRP: $67.95Now: $55.00Was: $67.95A top-end rebuild demands precision and reliability—compromise here and you're risking blow-by, compression loss, and catastrophic engine failure. The PROX Top End Gasket Set for the Honda XR650L...09347118- SKU:
- 09347118
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
MSRP: $67.95Now: $55.00Was: $67.95 -
On Sale
PROX Top End Gasket Set - Husqvarna/Gas Gas/KTM 35.6216
PROX
MSRP: $72.95Now: $59.00Was: $72.95A top-end rebuild demands precision—worn gaskets compromise compression, invite oil seepage, and undermine engine reliability. The PROX Top End Gasket Set delivers the complete seal integrity your...09347147- SKU:
- 09347147
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
MSRP: $72.95Now: $59.00Was: $72.95 -
On Sale
PROX Top End Gasket Set - Husqvarna/Gas Gas/KTM 35.6319
PROX
MSRP: $89.95Now: $76.00Was: $89.95A leaking or compromised top-end gasket set will compromise combustion efficiency, increase blow-by, and force you back into the shop. This PROX gasket set delivers the precision fit and material...09347151- SKU:
- 09347151
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $89.95Now: $76.00Was: $89.95Qty in Cart: 0Quantity:Price:MSRP: $89.95Now: $76.00Was: $89.95Subtotal: -
On Sale
PROX Piston Kit - 71.94 mm - Gas Gas | Husqvarna | KTM 01.6388.A
PROX
MSRP: $189.95Now: $161.00Was: $189.95A 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 71.94 mm Piston Kit is engineered to...09106266- SKU:
- 09106266
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $189.95Now: $161.00Was: $189.95Qty in Cart: 0Quantity:Price:MSRP: $189.95Now: $161.00Was: $189.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - Suzuki/Kawasaki 34.4021
PROX
MSRP: $59.95Now: $51.00Was: $59.95A complete engine rebuild demands precision sealing at every junction—this PROX Gasket Kit delivers all the OEM-quality gaskets and seals you need to restore compression, eliminate leaks, and ensure...09345587- SKU:
- 09345587
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $59.95Now: $51.00Was: $59.95Qty in Cart: 0Quantity:Price:MSRP: $59.95Now: $51.00Was: $59.95Subtotal: -
On Sale
PROX Gasket Kit - Complete - Suzuki/Kawasaki 34.4100
PROX
MSRP: $46.95Now: $38.00Was: $46.95A complete engine rebuild demands precision—gaskets that seal consistently under load, valve stem seals that hold pressure, and every component engineered to specification. This PROX kit delivers...09345589- SKU:
- 09345589
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $46.95Now: $38.00Was: $46.95 -
On Sale
PROX Top End Gasket Set - Honda CRF450R 35.1429
PROX
MSRP: $104.95Now: $89.00Was: $104.95A top-end rebuild demands precision—and gasket failure isn't an option when you're pushing your CRF450R to the limit. The PROX Top End Gasket Set delivers OEM-grade sealing with materials engineered...09345683- SKU:
- 09345683
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $104.95Now: $89.00Was: $104.95Qty in Cart: 0Quantity:Price:MSRP: $104.95Now: $89.00Was: $104.95Subtotal: -
On Sale
PROX Crankshaft Oil Seal Set - Kawasaki 42.4351
PROX
MSRP: $25.95Now: $21.00Was: $25.95A failing crankshaft oil seal is a silent killer—it allows oil to seep past critical bearing surfaces, risking catastrophic engine damage and costly rebuilds. The PROX Crankshaft Oil Seal Set...09351278- SKU:
- 09351278
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Crankshaft Oil Seal Set - Beta 42.7218
PROX
MSRP: $22.95Now: $17.00Was: $22.95Crankshaft oil seals are critical barriers against oil leakage and contamination—worn or failed seals compromise engine efficiency and can lead to costly damage. The PROX 42.7218 set delivers...09351279- SKU:
- 09351279
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
MSRP: $22.95Now: $17.00Was: $22.95 -
On Sale
PROX Crankshaft Oil Seal Set - Beta 42.7220
PROX
MSRP: $22.95Now: $17.00Was: $22.95A complete crankshaft rebuild demands precision sealing to prevent oil leakage and maintain engine integrity. The PROX Crankshaft Oil Seal Set delivers OEM-specification components manufactured to...09351280- SKU:
- 09351280
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
MSRP: $22.95Now: $17.00Was: $22.95 -
On Sale
PROX Crankshaft Oil Seal Set - Beta 42.7350
PROX
MSRP: $30.95Now: $25.00Was: $30.95A compromised crankshaft seal can lead to catastrophic oil loss and engine damage—especially under high RPM conditions where pressure spikes expose even minor leaks. The PROX Crankshaft Oil Seal Set...09351281- SKU:
- 09351281
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
MSRP: $30.95Now: $25.00Was: $30.95 -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940010
PROX
MSRP: $37.95Now: $30.00Was: $37.95A failing clutch master cylinder compromises your ability to modulate power delivery and control—critical factors whether you're on the track or tackling demanding road conditions. This PROX repair...06170426- SKU:
- 06170426
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $37.95Now: $30.00Was: $37.95 -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940011
PROX
MSRP: $55.95Now: $42.00Was: $55.95A failing clutch master cylinder compromises your ability to engage and disengage the drivetrain smoothly—and safely. The PROX 16.940011 Repair Kit delivers all the seals, springs, and internal...06170428- SKU:
- 06170428
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $55.95Now: $42.00Was: $55.95Qty in Cart: 0Quantity:Price:MSRP: $55.95Now: $42.00Was: $55.95Subtotal: -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940012
PROX
MSRP: $55.95Now: $42.00Was: $55.95A worn or failing clutch master cylinder compromises your ability to engage and disengage the clutch smoothly, leading to poor shift quality and potential safety issues on track or street. This PROX...06170429- SKU:
- 06170429
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
MSRP: $55.95Now: $42.00Was: $55.95 -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940014
PROX
MSRP: $32.95Now: $25.00Was: $32.95A worn or leaking clutch master cylinder compromises your ability to engage and disengage the clutch reliably, directly impacting your control and safety on track or street. This PROX repair kit...06170430- SKU:
- 06170430
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
MSRP: $32.95Now: $25.00Was: $32.95 -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940029
PROX
MSRP: $32.95Now: $25.00Was: $32.95A failing clutch master cylinder compromises your ability to engage and disengage the drivetrain reliably—whether you're on the track or the street. This PROX repair kit provides all the internal...06170432- SKU:
- 06170432
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $32.95Now: $25.00Was: $32.95 -
On Sale
PROX Repair Kit - Master Cylinder - Clutch 16.940030
PROX
MSRP: $37.95Now: $30.00Was: $37.95A failing clutch master cylinder compromises your ability to modulate power delivery and can leave you stranded mid-session or mid-drive. The PROX 16.940030 Repair Kit provides all the seals,...06170433- SKU:
- 06170433
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
MSRP: $37.95Now: $30.00Was: $37.95 -
On Sale
PROX Connecting Rod Kit - Honda 03.1363
PROX
MSRP: $173.95Now: $141.00Was: $173.95A connecting rod kit is critical infrastructure for any high-performance Honda engine build—it directly transfers combustion forces from the piston to the crankshaft, making durability and precision...09230694- SKU:
- 09230694
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $173.95Now: $141.00Was: $173.95 -
On Sale
PROX Connecting Rod Kit - Yamaha 03.2018
PROX
MSRP: $118.95Now: $93.00Was: $118.95A connecting rod failure mid-race or mid-rebuild can derail your entire engine program. The PROX Connecting Rod Kit for Yamaha engines delivers the dimensional precision and material strength needed...09230695- SKU:
- 09230695
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $118.95Now: $93.00Was: $118.95 -
On Sale
PROX Connecting Rod Kit - Yamaha 03.2232
PROX
MSRP: $132.95Now: $102.00Was: $132.95A connecting rod kit is critical for maintaining engine integrity and performance—it directly transfers combustion forces from your pistons to the crankshaft, and a worn or damaged rod can cause...09230696- SKU:
- 09230696
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $132.95Now: $102.00Was: $132.95 -
On Sale
PROX Connecting Rod Kit - Gas Gas | Yamaha 03.2432
PROX
MSRP: $183.95Now: $150.00Was: $183.95A connecting rod is critical to engine reliability—it directly transfers combustion force from the piston to the crankshaft under extreme stress and temperature. PROX's double-forged construction...09230697- SKU:
- 09230697
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
MSRP: $183.95Now: $150.00Was: $183.95 -
On Sale
PROX Connecting Rod Kit - Husaberg | Husqvarna | KTM 03.6333
PROX
MSRP: $232.95Now: $195.00Was: $232.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly impacts power delivery, reliability, and engine longevity. The PROX Connecting Rod Kit for...09230699- SKU:
- 09230699
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $232.95Now: $195.00Was: $232.95 -
On Sale
PROX Connecting Rod Kit - Beta 03.7322
PROX
MSRP: $137.95Now: $110.00Was: $137.95A connecting rod is the critical link between your piston and crankshaft—any weakness here directly compromises power delivery and engine reliability. The PROX Connecting Rod Kit is engineered to OEM...09230702- SKU:
- 09230702
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $137.95Now: $110.00Was: $137.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Honda 23.CBS14005
PROX
MSRP: $138.95Now: $110.00Was: $138.95A worn crankshaft bearing or compromised seal will rapidly degrade engine performance and reliability. This ProX kit replaces all critical bearing and seal components in one complete package,...09240701- SKU:
- 09240701
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $138.95Now: $110.00Was: $138.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Kawasaki 23.CBS43051
PROX
MSRP: $106.95Now: $85.00Was: $106.95A crankshaft bearing and seal failure can sideline your engine and compromise reliability when you need it most. This PROX kit delivers OEM-specification components engineered to restore your...09240702- SKU:
- 09240702
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $106.95Now: $85.00Was: $106.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS60001
PROX
MSRP: $38.95Now: $31.00Was: $38.95A properly sealed crankshaft is fundamental to engine longevity—compromised bearings and worn seals lead to oil starvation and contamination that cascade into catastrophic failure. This ProX kit...09240703- SKU:
- 09240703
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $38.95Now: $31.00Was: $38.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS60009
PROX
MSRP: $41.95Now: $34.00Was: $41.95A worn or damaged crankshaft bearing and seal assembly will compromise engine integrity, reduce performance, and risk catastrophic failure. The PROX Crankshaft Bearing/Seal Kit delivers...09240704- SKU:
- 09240704
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM 23.CBS63013
PROX
MSRP: $187.95Now: $150.00Was: $187.95A compromised crankshaft bearing or seal will quickly degrade engine performance and lead to catastrophic internal damage. The PROX Crankshaft Bearing/Seal Kit supplies all necessary components to...09240705- SKU:
- 09240705
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $187.95Now: $150.00Was: $187.95Qty in Cart: 0Quantity:Price:MSRP: $187.95Now: $150.00Was: $187.95Subtotal: -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husqvarna/KTM 23.CBS63016
PROX
MSRP: $180.95Now: $144.00Was: $180.95Crankshaft bearing and seal failure can compromise engine integrity and sideline your machine at critical moments. This ProX kit delivers OEM-specification components engineered for reliability,...09240706- SKU:
- 09240706
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $180.95Now: $144.00Was: $180.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - KTM 23.CBS64007
PROX
MSRP: $169.95Now: $136.00Was: $169.95A worn crankshaft bearing or degraded seal compromises engine reliability and can lead to catastrophic damage if left unaddressed. The PROX Crankshaft Bearing/Seal Kit restores OEM-specification...09240708- SKU:
- 09240708
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $169.95Now: $136.00Was: $169.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Husaberg/Husqvarna/KTM 23.CBS64012
PROX
MSRP: $95.95Now: $76.00Was: $95.95A crankshaft bearing and seal kit is essential maintenance for keeping your engine reliable through demanding riding conditions. ProX's OEM-specification design ensures your crankshaft operates with...09240709- SKU:
- 09240709
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $95.95Now: $76.00Was: $95.95 -
On Sale
PROX Crankshaft Bearing/Seal Kit - Gas-Gas/Husqvarna/KTM 23.CBS64016
PROX
MSRP: $169.95Now: $136.00Was: $169.95A crankshaft bearing and seal kit is essential maintenance for keeping your two-stroke engine running at peak performance and reliability. Over time, factory bearings wear and seals degrade, allowing...09240710- SKU:
- 09240710
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $169.95Now: $136.00Was: $169.95
