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 - Kawasaki 650 - +.25 mm 50-256-04K
WSM
$113.84When you're pushing a Kawasaki 650 to its limits, stock pistons become the weak link in your engine's durability chain. The WSM Piston Kit delivers OEM-matching quality with measurable performance...09103540- SKU:
- 09103540
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 80.25 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$113.84Qty in Cart: 0Quantity:Price:$113.84Subtotal: -
WSM Piston Kit - Kawasaki 650 - +.50 mm 50-256-05K
WSM
$113.84If you're rebuilding your Kawasaki 650 or chasing higher compression ratios, WSM's +.50 mm piston kit delivers OEM-quality construction with performance-oriented features that reduce friction and...09103541- SKU:
- 09103541
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$113.84 -
WSM Piston Kit - Kawasaki 750 - Standard 50-258K
WSM
$124.29When your Kawasaki 750 is pushed to its limits, factory pistons can't keep up with the thermal stress and wear. The WSM Piston Kit delivers OEM-matching quality with engineered upgrades—specifically...09103544- SKU:
- 09103544
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- 85.00 MM
$124.29 -
WSM Piston Kit - Kawasaki 750 - +.25 mm 50-258-04K
WSM
$124.29When you're pushing a Kawasaki 750 to its limits, stock pistons become your limiting factor. The WSM Piston Kit delivers OEM-matching quality with engineered improvements—specifically the MOS2...09103545- SKU:
- 09103545
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 85.25 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
$124.29Qty in Cart: 0Quantity:Price:$124.29Subtotal: -
WSM Piston Kit - Polaris 500 - Standard 50-311K
WSM
$125.82When your Polaris 500 is pushing limits on the track or trail, your pistons need to handle sustained combustion pressures and thermal stress without compromise. The WSM Piston Kit delivers...09103549- SKU:
- 09103549
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- BORE SIZE METRIC:
- 92.00 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
$125.82 -
WSM Piston Kit - Polaris 500 - +.25 mm 50-311-04K
WSM
$125.82If you're rebuilding a Polaris 500 engine, piston quality directly impacts reliability, power output, and engine longevity. The WSM Piston Kit delivers OEM-equivalent construction with measurable...09103550- SKU:
- 09103550
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 92.25 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- ATV
$125.82Qty in Cart: 0Quantity:Price:$125.82Subtotal: -
WSM Piston Kit - Polaris 500 - +.50 mm 50-311-05K
WSM
$125.82A worn or damaged piston directly undermines engine performance and reliability—especially in high-demand racing and off-road applications. The WSM Piston Kit for Polaris 500 delivers OEM-equivalent...09103551- SKU:
- 09103551
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 92.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
$125.82Qty in Cart: 0Quantity:Price:$125.82Subtotal: -
WSM Piston Kit - Polaris 500 - +.75 mm 50-311-06K
WSM
$125.82Factory piston kits wear down—especially under racing conditions—and overbore replacements demand precision engineering to restore power and reliability. The WSM Piston Kit for Polaris 500 delivers...09103552- SKU:
- 09103552
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- BORE - OVERSIZE:
- +0,75 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.75 MM
- BORE SIZE METRIC:
- 92.75 MM
- PISTON MATERIAL:
- ALUMINUM
$125.82 -
WSM Piston Kit - Polaris 500 - +1 mm 50-311-07K
WSM
$125.82When you're pushing a Polaris 500 to its limits, stock pistons become the weak link in your engine's performance chain. The WSM +1 mm piston kit delivers OEM-quality construction with engineered...09103553- SKU:
- 09103553
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- BORE SIZE METRIC:
- 93.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM
$125.82 -
WSM Piston Kit - Standard - Yamaha 50-521P
WSM
$98.62If you're serious about maximizing engine response and reducing parasitic losses in your build, the WSM Piston Kit delivers measurable gains through lightweight engineering and precision design. The...09102729- SKU:
- 09102729
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- TYPE:
- DUAL RING
$98.62 -
WSM Piston Kit - .50mm - Yamaha 50-521-05PK
WSM
$103.55If you're serious about extracting every bit of performance from your engine, piston quality directly impacts your power delivery, throttle response, and engine longevity. The WSM Piston Kit reduces...09102730- SKU:
- 09102730
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- TYPE:
- DUAL RING
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
$103.55 -
WSM Piston Assembly 50-520-65
WSM
$155.79The WSM Piston Assembly 50-520-65 delivers precision-engineered performance for serious engine builders seeking reliability in high-demand racing applications. MOS2 coating technology maximizes heat...09100260- SKU:
- 09100260
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- STANDARD BORE
- BORE SIZE METRIC:
- 65.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$155.79 -
WSM Piston Assembly 50-520-665
WSM
$155.79If you're running a Banshee engine with high-performance aspirations, piston choice directly impacts your horsepower delivery and engine longevity. The WSM Piston Assembly 50-520-665 combines German...09100263- SKU:
- 09100263
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE METRIC:
- +2.50 MM
- BORE SIZE METRIC:
- 66.50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +2,50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- STYLE:
- STANDARD BORE
- UNITS:
- EACH
$155.79 -
WSM Piston Assembly 50-520-5-665
WSM
$165.25The WSM Piston Assembly 50-520-5-665 delivers the precision engineering required for high-revving, forced-induction applications where heat management and durability directly impact performance...09100269- SKU:
- 09100269
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 66.50 MM
- RIDING STYLE:
- ATV
- STYLE:
- LONG ROD WITH STANDARD BORE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,50 MM
- BORE - OVERSIZE METRIC:
- +2.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$165.25 -
WSM Piston Assembly 50-520-68
WSM
$185.83If you're building a high-performance two-stroke engine, piston quality directly impacts your power delivery, reliability, and race-day consistency. The WSM Piston Assembly 50-520-68 is engineered...09100270- SKU:
- 09100270
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- STYLE:
- BIG BORE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE:
- +4,00 MM
- BORE SIZE METRIC:
- 68.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$185.83 -
WSM Piston Assembly 50-520-685
WSM
$185.83The WSM Piston Assembly 50-520-685 delivers the precision and durability required for high-RPM applications where standard pistons fall short. MOS2 coating reduces friction and manages extreme...09100271- SKU:
- 09100271
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STYLE:
- BIG BORE
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +4,50 MM
- BORE SIZE METRIC:
- 68.50 MM
- BORE - OVERSIZE METRIC:
- +4.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$185.83 -
WSM Piston Assembly 50-520-69
WSM
$185.83The WSM Piston Assembly 50-520-69 is engineered for serious racers and high-performance builders who demand reliability under extreme combustion pressures. MOS2 coating maximizes heat dissipation and...09100272- SKU:
- 09100272
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STYLE:
- BIG BORE
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- RIDING STYLE:
- ATV
$185.83 -
WSM Piston Assembly 50-520-5-685
WSM
$197.10If you're running a high-revving two-stroke engine that demands precision and durability, the WSM Piston Assembly 50-520-5-685 delivers the reliability and performance you need to stay competitive...09100277- SKU:
- 09100277
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +4,50 MM
- BORE - OVERSIZE METRIC:
- +4.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- STYLE:
- BIG BORE LONG ROD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.50 MM
$197.10 -
WSM Piston Assembly 50-520-5-695
WSM
$197.10If you're building a high-displacement Banshee engine or pushing the limits of your current setup, piston selection directly impacts reliability, longevity, and power delivery under sustained load...09100279- SKU:
- 09100279
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- ATV
- STYLE:
- BIG BORE LONG ROD
- UNITS:
- EACH
- BORE - OVERSIZE:
- +5,50 MM
- BORE SIZE METRIC:
- 69.50 MM
- BORE - OVERSIZE METRIC:
- +5.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$197.10 -
VERTEX Piston Kit 22569200
VERTEX
$150.95Precision piston design demands materials that withstand extreme combustion pressures and thermal cycling without compromise. The VERTEX Piston Kit 22569200 combines proprietary heat treatment with...09101085- SKU:
- 09101085
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 207 CC
- PISTON DIAMETER METRIC:
- 67.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$150.95
