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
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PROX Piston Kit 01.4022.A
PROX
$79.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100022- SKU:
- 09100022
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 44.45 MM
- PISTON DIAMETER METRIC:
- 42.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
$79.95 -
PROX Piston Kit 01.4022.B
PROX
$79.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100023- SKU:
- 09100023
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 44.46 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 44.46 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- RIDING STYLE:
- OFF-ROAD
$79.95 -
PROX Piston Kit 01.4223.B
PROX
$105.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100025- SKU:
- 09100025
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON DIAMETER METRIC:
- 53.96 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD SIZE B
- UNITS:
- EACH
- BORE SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
$105.95 -
PROX Piston Kit 01.4223.C
PROX
$101.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100026- SKU:
- 09100026
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 53.97 MM
- PISTON SIZE METRIC:
- STANDARD SIZE C
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 53.97 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
$101.95 -
PROX Piston Kit 01.2406.A
PROX
$179.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100027- SKU:
- 09100027
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 76.95 MM
- BORE SIZE METRIC:
- 76.95 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
$179.95 -
PROX Piston Kit 01.2406.B
PROX
$179.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100028- SKU:
- 09100028
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 76.96 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD SIZE B
- RIDING STYLE:
- OFF-ROAD
$179.95 -
PROX Piston Kit 01.2427.A
PROX
$185.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09100031- SKU:
- 09100031
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 94.95 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
$185.95 -
PROX Engine Rebuild Kit 10.EK5806.A
PROX
$1,099.95PROX Engine Rebuild Kit09031687- SKU:
- 09031687
- Availability:
- Ships Same Business Day
- Weight:
- 25.51 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5806.B
PROX
MSRP: $1,099.95Now: $732.00Was: $1,099.95PROX Engine Rebuild Kit09031688- SKU:
- 09031688
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.01 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- ATV
MSRP: $1,099.95Now: $732.00Was: $1,099.95 -
PROX Engine Rebuild Kit 10.EK5806.A1
PROX
$1,099.95PROX Engine Rebuild Kit09031690- SKU:
- 09031690
- Availability:
- Ships Same Business Day
- Weight:
- 26.61 LBS
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,099.95 -
PROX Engine Rebuild Kit 10.EK5805.A1
PROX
$1,099.95PROX Engine Rebuild Kit09031696- SKU:
- 09031696
- Availability:
- Ships Same Business Day
- Weight:
- 25.61 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
$1,099.95 -
PROX Piston Kit - KDX200 '86-'06 01.4285.D
PROX
$129.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09101453- SKU:
- 09101453
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PISTON DIAMETER METRIC:
- 65.97 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- MOLY COATED
$129.95Qty in Cart: 0Quantity:Price:$129.95Subtotal: -
PROX Piston Kit 01.4409.A
PROX
$189.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09101465- SKU:
- 09101465
- Availability:
- Ships Same Business Day
- Weight:
- 0.82 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.97 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PISTON DIAMETER METRIC:
- 95.97 MM
$189.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5806.C
PROX
MSRP: $1,099.95Now: $732.00Was: $1,099.95PROX Engine Rebuild Kit09031689- SKU:
- 09031689
- Availability:
- Ships Same Business Day
- Weight:
- 25.56 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- +0.02 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
MSRP: $1,099.95Now: $732.00Was: $1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5805.B1
PROX
MSRP: $1,099.95Now: $732.00Was: $1,099.95PROX Engine Rebuild Kit09031697- SKU:
- 09031697
- Availability:
- Ships Same Business Day
- Weight:
- 24.41 LBS
- BORE SIZE METRIC:
- +0.01 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- UTV
MSRP: $1,099.95Now: $732.00Was: $1,099.95 -
On Sale
PROX Engine Rebuild Kit 10.EK5805.C1
PROX
MSRP: $1,099.95Now: $732.00Was: $1,099.95PROX Engine Rebuild Kit09031698- SKU:
- 09031698
- Availability:
- Ships Same Business Day
- Weight:
- 25.86 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- +0.02 MM
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- UTV
MSRP: $1,099.95Now: $732.00Was: $1,099.95 -
PROX Piston Kit 01.4409.B
PROX
$189.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances,...09101466- SKU:
- 09101466
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- STANDARD SIZE B
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.98 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 95.98 MM
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
PROX Top End Gasket Set - Yamaha 35.2214
PROX
$24.95PROX Top End Gasket Set - Yamaha09345693- SKU:
- 09345693
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- TYPE:
- TOP END
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
PROX Top End Gasket Set - Yamaha 35.2218
PROX
$24.95PROX Top End Gasket Set - Yamaha09345694- SKU:
- 09345694
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$24.95 -
PROX Top End Gasket Set - Yamaha 35.2222
PROX
$24.95PROX Top End Gasket Set - Yamaha09345695- SKU:
- 09345695
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$24.95 -
PROX Top End Gasket Set - Yamaha 35.2225
PROX
$29.95PROX Top End Gasket Set - Yamaha09345696- SKU:
- 09345696
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$29.95 -
PROX Top End Gasket Set - Yamaha 35.2319
PROX
$29.95PROX Top End Gasket Set - Yamaha09345702- SKU:
- 09345702
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$29.95 -
PROX Top End Gasket Set - Yamaha 35.2320
PROX
$29.95PROX Top End Gasket Set - Yamaha09345703- SKU:
- 09345703
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
PROX Top End Gasket Set - Yamaha 35.2401
PROX
$59.95PROX Top End Gasket Set - Yamaha09345705- SKU:
- 09345705
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
$59.95 -
PROX Top End Gasket Set - Yamaha 35.2414
PROX
$54.95PROX Top End Gasket Set - Yamaha09345707- SKU:
- 09345707
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET SET
$54.95 -
PROX Top End Gasket Set - Yamaha 35.2426
PROX
$69.95PROX Top End Gasket Set - Yamaha09345711- SKU:
- 09345711
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$69.95 -
PROX Top End Gasket Set - Suzuki 35.3111
PROX
$14.95PROX Top End Gasket Set - Suzuki09345716- SKU:
- 09345716
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$14.95Qty in Cart: 0Quantity:Price:$14.95Subtotal: -
PROX Top End Gasket Set - Suzuki 35.3218
PROX
$24.95PROX Top End Gasket Set - Suzuki09345724- SKU:
- 09345724
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$24.95 -
PROX Top End Gasket Set - Suzuki 35.3224
PROX
$24.95PROX Top End Gasket Set - Suzuki09345725- SKU:
- 09345725
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$24.95 -
PROX Top End Gasket Set - Suzuki 35.3322
PROX
$39.95PROX Top End Gasket Set - Suzuki09345732- SKU:
- 09345732
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
PROX Top End Gasket Set - Suzuki 35.3323
PROX
$39.95PROX Top End Gasket Set - Suzuki09345733- SKU:
- 09345733
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$39.95 -
PROX Top End Gasket Set - Suzuki 35.3405
PROX
$64.95PROX Top End Gasket Set - Suzuki09345740- SKU:
- 09345740
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$64.95 -
PROX Top End Gasket Set - Suzuki 35.3420
PROX
$54.95PROX Top End Gasket Set - Suzuki09345742- SKU:
- 09345742
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$54.95 -
PROX Top End Gasket Set - Kawasaki/Suzuki 35.4021
PROX
$29.95PROX Top End Gasket Set - Kawasaki/Suzuki09345743- SKU:
- 09345743
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$29.95 -
PROX Top End Gasket Set - Kawasaki/Suzuki 35.4100.90
PROX
$19.95PROX Top End Gasket Set - Kawasaki/Suzuki09345744- SKU:
- 09345744
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$19.95 -
PROX Top End Gasket Set - Kawasaki 35.4121
PROX
$24.95PROX Top End Gasket Set - Kawasaki09345748- SKU:
- 09345748
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$24.95 -
PROX Top End Gasket Set - Kawasaki 35.4125
PROX
$34.95PROX Top End Gasket Set - Kawasaki09345750- SKU:
- 09345750
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$34.95 -
PROX Top End Gasket Set - Suzuki 35.4198
PROX
$34.95PROX Top End Gasket Set - Suzuki09345752- SKU:
- 09345752
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$34.95 -
PROX Top End Gasket Set - Kawasaki 35.4221
PROX
$44.95PROX Top End Gasket Set - Kawasaki09345757- SKU:
- 09345757
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$44.95 -
PROX Top End Gasket Set - Kawasaki 35.4223
PROX
$44.95PROX Top End Gasket Set - Kawasaki09345758- SKU:
- 09345758
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$44.95
