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 - +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...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...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...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...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...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...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
$93.81Qty in Cart: 0Quantity:Price:$93.81Subtotal: -
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...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...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...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
$168.82A 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...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
$168.82 -
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...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...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...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...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...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...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...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...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: -
WSM Piston Kit 50-605-06K
WSM
$76.02The WSM Piston Kit 50-605-06K delivers OEM-equivalent quality with measurable durability improvements where it matters most—the combustion chamber. Whether you're rebuilding a worn engine or...09105253- SKU:
- 09105253
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.75 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,75 MM
- BORE SIZE METRIC:
- 86.75 MM
$76.02 -
WSM Piston Kit 50-541-04K
WSM
$101.45A quality piston kit is the foundation of engine reliability and performance—cutting corners here leads to catastrophic failures. The WSM Piston Kit 50-541-04K delivers OEM-equivalent construction...09105255- SKU:
- 09105255
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 83.25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
$101.45
