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
-
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 upgrades—specifically engineered to handle higher...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 heat while strengthening critical wear areas. The...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 the MOS2 coating that actively dissipates heat while...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 coating on the skirts that actively draws heat away from the...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 OEM-equivalent quality with engineering refinements that improve...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 performance upgrades—specifically, the MOS2 coating on the...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 or superior construction with proven durability...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 OEM-or-better construction with a proprietary MOS2...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 improvements—particularly the enhanced E-clip design and...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 shorter piston skirt reduces rotational mass, allowing...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 rotational mass and heat generation, allowing your...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 dissipation and reduces friction, while German...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 engineering precision with MOS2 coating technology to...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. German-engineered and optimized for long-rod...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 for demanding applications where thermal stability and...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 combustion temperatures, while matched porting to WSM Banshee...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 reduces friction, directly translating to sustained...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. MOS2 coating reduces friction and improves heat...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. The WSM Piston Assembly 50-520-5-695 is engineered to...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 advanced surface coatings to deliver the reliability and...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
