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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WSM Piston Kit - Polaris - Standard 50-305PK
WSM
$95.36Stock pistons can't handle the demands of high-performance riding—they overheat, wear prematurely, and rob you of power. WSM's piston kit delivers OEM-quality construction with advanced engineering that reduces friction, extends service life, and unlocks...50305- SKU:
- 50305
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 83.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$95.36Qty in Cart: 0Quantity:Price:$95.36Subtotal: -
WSM Piston Kit - Polaris - +.50 mm 50-305-05PK
WSM
$95.36If you're pushing your Polaris engine to its limits, stock pistons won't cut it. The WSM Piston Kit delivers OEM-quality construction with performance-focused engineering—MOS2-coated skirts that actively reduce friction and heat while hardened ring...5030505- SKU:
- 5030505
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 83.50 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
$95.36Qty in Cart: 0Quantity:Price:$95.36Subtotal: -
WSM Piston Kit - Polaris - +1 mm 50-305-07PK
WSM
$95.36When you're pushing your Polaris to the limit, factory pistons can't keep pace with the demands of high-RPM performance. The WSM Piston Kit delivers OEM-grade quality with engineered upgrades—MOS2-coated skirts that actively dissipate heat while reducing...5030507- SKU:
- 5030507
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$95.36Qty in Cart: 0Quantity:Price:$95.36Subtotal: -
WSM Piston Kit - Yamaha - Standard 50-530PK
WSM
$90.05OEM-equivalent pistons are the foundation of reliable engine performance, and WSM's piston kit delivers the durability and precision your Yamaha engine demands. The MOS2 coating on the skirts actively reduces friction and heat transfer, translating...50530- SKU:
- 50530
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$90.05 -
WSM Piston Kit - Yamaha - +.50 mm 50-530-05PK
WSM
$90.05High-performance pistons are critical to engine reliability and power output, especially in forced induction or high-RPM applications where OEM components reach their limits. The WSM Piston Kit delivers OEM-quality construction with performance-oriented...5053005- SKU:
- 5053005
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 66.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
$90.05 -
WSM Piston Kit - Yamaha - +1 mm 50-530-07PK
WSM
$90.05Stock pistons wear down and lose compression, robbing your engine of power and efficiency. WSM's +1mm piston kit restores performance beyond factory specs with precision engineering and advanced coatings designed for high-heat, high-stress racing...5053007- SKU:
- 5053007
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$90.05 -
WSM Piston Kit - Yamaha - Standard 50-520PK
WSM
$93.81Stock pistons wear out, lose compression, and rob your engine of power—especially under sustained racing conditions. The WSM Piston Kit delivers OEM-equivalent quality with engineered upgrades that reduce friction, manage heat more effectively, and...50520- SKU:
- 50520
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$93.81 -
WSM Piston Kit - Yamaha - +.50 mm 50-520-05PK
WSM
$93.81High-revving engines demand pistons engineered for extreme conditions—stock units simply won't sustain the thermal and mechanical stress of sustained performance. The WSM Piston Kit delivers OEM-equivalent quality with critical upgrades to ring groove...5052005- SKU:
- 5052005
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 64.50 MM
- MODEL:
- ORIGINAL
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$93.81 -
WSM Piston Kit - Yamaha - +1 mm 50-520-07PK
WSM
$93.81A piston kit is the heart of your engine's combustion cycle—when yours show wear, you lose compression, power, and efficiency. WSM's +1mm oversized pistons are engineered to restore your engine to peak performance while exceeding OEM quality standards...5052007- SKU:
- 5052007
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 65.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
$93.81 -
WSM Piston Kit 50-254K
WSM
$168.82Whether you're rebuilding a tired engine or preparing for competition, the WSM Piston Kit 50-254K delivers the precision and durability you need to get back on track with confidence. This complete kit includes everything required for a proper engine...09105202- SKU:
- 09105202
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 90.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$168.82 -
WSM Piston Kit 50-254-04K
WSM
$168.82A quality piston kit is foundational to engine reliability, and the WSM Piston Kit 50-254-04K delivers OEM-matching or superior construction without compromise. Whether you're rebuilding after high-mileage wear or preparing for competition, this kit...09105203- SKU:
- 09105203
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 90.25 MM
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- UNITS:
- KIT
$168.82 -
WSM Piston Kit 50-254-05K
WSM
$157.63A quality piston kit is the foundation of reliable engine performance, and the WSM Piston Kit 50-254-05K delivers OEM-grade construction with thoughtful engineering improvements. Whether you're rebuilding after extreme track use or maintaining precise...09105204- SKU:
- 09105204
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$157.63 -
WSM Piston Kit 50-222K
WSM
$74.43A worn or damaged piston kit compromises engine reliability and performance across the entire power band. The WSM Piston Kit 50-222K delivers OEM-equivalent quality with engineering refinements—including an improved E-clip design—that enhance durability...09105208- SKU:
- 09105208
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 65.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
$74.43 -
WSM Piston Kit 50-222-04K
WSM
$72.41The WSM Piston Kit 50-222-04K delivers OEM-matching quality with refined engineering where it matters most—the combustion chamber. Whether you're rebuilding after high-mileage wear or upgrading to tighter tolerances, this complete kit eliminates the...09105209- SKU:
- 09105209
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 65.25 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,25 MM
$72.41Qty in Cart: 0Quantity:Price:$72.41Subtotal: -
WSM Piston Kit 50-222-05K
WSM
$72.41A quality piston kit is foundational to engine reliability and performance—especially if you're rebuilding or upgrading your short block. The WSM Piston Kit 50-222-05K delivers OEM-equivalent construction with refinements like an improved E-clip design...09105210- SKU:
- 09105210
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 65.50 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
$72.41 -
WSM Piston Kit 50-257-09K
WSM
$96.69A precision piston kit engineered to meet or exceed OEM specifications, ensuring reliable performance across demanding engine conditions. The WSM 50-257-09K delivers improved durability through an enhanced E-clip design that reduces wear and extends...09105240- SKU:
- 09105240
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 75.50 MM
- BORE - OVERSIZE:
- +1,50 MM
- RIDING STYLE:
- ATV
$96.69Qty in Cart: 0Quantity:Price:$96.69Subtotal: -
WSM Piston Kit 50-251-06K
WSM
$165.71A quality piston kit is fundamental to engine reliability and performance—especially in high-demand racing and build applications where OEM components may not meet your specifications. The WSM Piston Kit 50-251-06K delivers construction that matches or...09105244- SKU:
- 09105244
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,75 MM
- BORE - OVERSIZE METRIC:
- +0.75 MM
- BORE SIZE METRIC:
- 81.75 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$165.71 -
WSM Piston Kit 50-251-07K
WSM
$165.71A high-revving engine demands pistons engineered to withstand extreme pressures and temperatures without compromise. The WSM Piston Kit 50-251-07K delivers OEM-equivalent quality with proven durability, designed for builders and racers who need reliable...09105245- SKU:
- 09105245
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 82.00 MM
$165.71Qty in Cart: 0Quantity:Price:$165.71Subtotal: -
WSM Piston Kit 50-315K
WSM
$111.27A quality piston kit is fundamental to engine reliability and performance—especially under high RPM and boost conditions. The WSM Piston Kit 50-315K delivers OEM-equivalent construction with a refined E-clip design that reduces wear and improves...09105247- SKU:
- 09105247
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
$111.27 -
WSM Piston Kit 50-314K
WSM
$134.56Piston kits are critical to engine reliability and performance—cheap ones fail under load, costing you time and money. The WSM Piston Kit 50-314K delivers OEM-grade quality with a refined design that handles high-RPM demands without compromise. Whether...09105248- SKU:
- 09105248
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PISTON SIZE METRIC:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$134.56Qty in Cart: 0Quantity:Price:$134.56Subtotal:
