ATV/UTV Piston and Ring Kits
ATV/UTV Piston & Ring Kits at JJ Motorsports
Rebuild your ATV/UTV engine with premium forged piston and ring kits from JJ Motorsports, featuring high-compression and big-bore options for massive power gains on Yamaha YFZ450, Honda TRX450R, Suzuki LTZ400, and more. These race-proven kits deliver superior durability and performance in off-road, trail, and dune conditions.
Shop Millennium, JE Pistons, and Wossner piston kits for championship-level quality. Explore related categories such as ATV/UTV engine for cylinders and gaskets, or ATV/UTV for cams and exhaust to complete your top-end rebuild and dominate the track or trail.
Top ATV/UTV Piston & Ring Kits
- Millennium Piston Kit K8897D500-2 – +5.00mm big-bore piston kit; forged for Yamaha YFZ450/R with rings, pin, and clips.
- JE Pistons Piston Kit 261546 – High-compression forged piston; includes rings and wrist pin for Honda TRX450R.
- Wossner Piston Kit 8094D050 – +0.50mm oversize piston kit; lightweight forged with moly coating for Suzuki LTZ400.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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PROX Piston Kit 01.1498.200
PROX
$109.45Your engine's heartbeat depends on pistons that can handle repeated combustion cycles without compromise. The PROX Piston Kit 01.1498.200 delivers OEM-equivalent reliability with precision engineering, ensuring consistent compression, minimal blow-by,...09102474- SKU:
- 09102474
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 92 MM
- PISTON DIAMETER METRIC:
- 92.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD
$109.45Qty in Cart: 0Quantity:Price:$109.45Subtotal: -
PROX Piston Kit 01.5805.B
PROX
$134.95Your engine's pistons are the hardworking center of combustion—and worn or damaged pistons mean loss of compression, power, and reliability. The PROX Piston Kit 01.5805.B delivers OEM-spec replacement performance without the dealer markup, engineered to...09105952- SKU:
- 09105952
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- UTV
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 79.96 MM
- UNITS:
- KIT
$134.95 -
On Sale
PROX Piston Kit 01.1495.050
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine demands reliability at high RPM, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.1495.050 delivers factory-spec performance without compromise, engineered to handle sustained boost and aggressive tuning while maintaining...PX2502- SKU:
- PX2502
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- PISTON DIAMETER METRIC:
- 85.50 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 85.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE IMPERIAL:
- +0.020'
- UNITS:
- EACH
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.1495.100
PROX
MSRP: $139.95Now: $119.00Was: $139.95Worn or damaged pistons compromise combustion efficiency, reduce power output, and risk catastrophic engine failure. The PROX Piston Kit 01.1495.100 restores your engine to OEM performance specifications with precision-engineered components manufactured...PX2504- SKU:
- PX2504
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- PISTON DIAMETER METRIC:
- 86.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE IMPERIAL:
- +0.040'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 86.00 MM
MSRP: $139.95Now: $119.00Was: $139.95Qty in Cart: 0Quantity:Price:MSRP: $139.95Now: $119.00Was: $139.95Subtotal: -
On Sale
PROX Piston Kit 01.2281.000
PROX
MSRP: $121.95Now: $90.00Was: $121.95When your engine's pistons wear beyond serviceable limits, you need a replacement that matches OEM performance without compromise. The PROX Piston Kit 01.2281.000 delivers precision-engineered internals manufactured to the same exacting standards as...PX4170- SKU:
- PX4170
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
MSRP: $121.95Now: $90.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2281.150
PROX
MSRP: $105.95Now: $90.00Was: $105.95A piston kit is the heart of engine reliability and performance—worn or damaged pistons compromise combustion efficiency, increase blowby, and accelerate wear throughout your engine. The PROX Piston Kit 01.2281.150 delivers OEM-quality replacement...PX4176- SKU:
- PX4176
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 67.50 MM
- PISTON SIZE METRIC:
- +1.50 MM
MSRP: $105.95Now: $90.00Was: $105.95Qty in Cart: 0Quantity:Price:MSRP: $105.95Now: $90.00Was: $105.95Subtotal: -
On Sale
PROX Piston Kit 01.2020.000
PROX
MSRP: $121.95Now: $85.00Was: $121.95A worn or damaged piston kit compromises engine compression, throttle response, and overall reliability—costing you performance on the track or road. The PROX Piston Kit 01.2020.000 restores your engine to OEM specifications with precision-engineered...PX4190- SKU:
- PX4190
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 64.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 64.00 MM
- PISTON SIZE METRIC:
- STANDARD
- RIDING STYLE:
- STREET
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2020.025
PROX
MSRP: $99.95Now: $85.00Was: $99.95A piston kit is the foundation of reliable engine performance—worn or damaged pistons compromise compression, efficiency, and durability. The PROX Piston Kit 01.2020.025 delivers OEM-equivalent quality with precision engineering, making it an ideal...PX4191- SKU:
- PX4191
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- BORE SIZE METRIC:
- 64.25 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- PISTON SIZE METRIC:
- +0.25 MM
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 64.25 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
MSRP: $99.95Now: $85.00Was: $99.95Qty in Cart: 0Quantity:Price:MSRP: $99.95Now: $85.00Was: $99.95Subtotal: -
On Sale
PROX Piston Kit 01.2020.075
PROX
MSRP: $121.95Now: $85.00Was: $121.95Worn or damaged pistons compromise combustion efficiency, increase blow-by, and accelerate engine wear—ultimately costing you power and reliability. The PROX Piston Kit 01.2020.075 restores your engine to OEM performance specifications using...PX4193- SKU:
- PX4193
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 64.75 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PISTON SIZE METRIC:
- +0.75 MM
- BORE SIZE METRIC:
- 64.75 MM
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2020.100
PROX
MSRP: $121.95Now: $85.00Was: $121.95Factory piston wear is one of the most common reasons for lost compression, power, and reliability in high-mileage engines. The PROX Piston Kit 01.2020.100 restores your engine to OEM specifications with precision-manufactured components engineered for...PX4194- SKU:
- PX4194
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE METRIC:
- 65.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 65.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2020.125
PROX
MSRP: $99.95Now: $85.00Was: $99.95When your engine demands precise combustion and reliable performance cycle after cycle, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.2020.125 delivers factory-engineered reliability with Japanese manufacturing precision, ensuring...PX4195- SKU:
- PX4195
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PISTON SIZE METRIC:
- +1.25 MM
- PISTON DIAMETER METRIC:
- 65.25 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.25 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
MSRP: $99.95Now: $85.00Was: $99.95 -
On Sale
PROX Piston Kit 01.2020.150
PROX
MSRP: $121.95Now: $85.00Was: $121.95When your engine demands reliability and precision, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.2020.150 delivers exact fitment and performance specifications without compromise, engineered in Japan to meet or exceed factory standards...PX4196- SKU:
- PX4196
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 65.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 65.50 MM
- PISTON SIZE METRIC:
- +1.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $121.95Now: $85.00Was: $121.95 -
On Sale
PROX Piston Kit 01.2660.000
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine's pistons show wear, you're losing compression, efficiency, and power—and risking catastrophic failure. The PROX Piston Kit 01.2660.000 is engineered to OEM specifications using high-silicon-content aluminum alloy, delivering the...PX4670- SKU:
- PX4670
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 100.00 MM
- BORE SIZE METRIC:
- 100.00 MM
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.2660.050
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine demands precision and reliability, OEM-quality pistons are non-negotiable. The PROX Piston Kit 01.2660.050 delivers Japanese manufacturing excellence with high-silicon aluminum construction that meets or exceeds factory specifications,...PX4672- SKU:
- PX4672
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- BORE SIZE METRIC:
- 100.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 100.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.2660.100
PROX
MSRP: $139.95Now: $119.00Was: $139.95When your engine demands reliability at high RPM, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.2660.100 delivers factory-engineered performance with the precision tolerances required for sustained power delivery and durability. This...PX4674- SKU:
- PX4674
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- BORE SIZE METRIC:
- 101.00 MM
- RIDING STYLE:
- UTV
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 101.00 MM
MSRP: $139.95Now: $119.00Was: $139.95Qty in Cart: 0Quantity:Price:MSRP: $139.95Now: $119.00Was: $139.95Subtotal: -
On Sale
PROX Piston Kit 01.1495.000
PROX
MSRP: $155.95Now: $119.00Was: $155.95When your engine demands precision and reliability, OEM-equivalent performance is non-negotiable. The PROX Piston Kit 01.1495.000 delivers factory-spec durability with CNC-machined accuracy, ensuring consistent combustion and extended engine life...PX2500- SKU:
- PX2500
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- BORE SIZE METRIC:
- 85.00 MM
- PISTON SIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 85.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.1495.025
PROX
MSRP: $155.95Now: $119.00Was: $155.95Whether you're rebuilding after high-mileage wear or restoring a race engine to factory specifications, the PROX Piston Kit 01.1495.025 delivers the precision and durability that serious engine builders depend on. Cast from high-silicon-content aluminum...PX2501- SKU:
- PX2501
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- BORE SIZE METRIC:
- 85.25 MM
- PISTON DIAMETER METRIC:
- 85.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE IMPERIAL:
- +0.010'
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $155.95Now: $119.00Was: $155.95 -
On Sale
PROX Piston Kit 01.2020.050
PROX
MSRP: $121.95Now: $85.00Was: $121.95OEM-equivalent piston performance demands precision engineering and materials that can withstand extreme combustion pressures without compromise. The PROX Piston Kit 01.2020.050 delivers exactly that—Japanese-manufactured pistons cast from high-silicon...PX4192- SKU:
- PX4192
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 64.50 MM
MSRP: $121.95Now: $85.00Was: $121.95 -
VERTEX Piston Kit - Standard VTK22568
VERTEX
$459.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Standard VTK22568 delivers the durability and precision needed for both street and circuit applications. This kit combines advanced heat treatment with a specialized...09102994- SKU:
- 09102994
- Availability:
- Ships Same Business Day
- Weight:
- 2.10 LBS
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO:
- STANDARD
- DISPLACEMENT:
- 350 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$459.95 -
VERTEX Piston Kit VTK22568050
VERTEX
$412.95High-performance pistons are critical to engine reliability and power output, especially under sustained boost or high RPM conditions. The VERTEX Piston Kit VTK22568050 combines precision engineering with proven durability coatings to maximize ring seal,...09102996- SKU:
- 09102996
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON DIAMETER METRIC:
- 64.45 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 64.50 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO:
- STANDARD
- DISPLACEMENT:
- 350 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$412.95
