Dirt Bike Piston and Ring Kits
Dirt Bike Piston & Ring Kits for Yamaha YZ85, WR250 & YZ250 at JJ Motorsports
Rebuild your dirt bike's top end for maximum power and reliability with premium piston and ring kits from JJ Motorsports, forged from high-strength aluminum for superior heat resistance, lightweight performance, and precise fit in motocross, enduro, and trail riding. Our selection includes complete kits with pistons, high-performance rings, wrist pins, circlips, top-end bearings, and gaskets designed for enhanced combustion efficiency, reduced blow-by, and longer engine life under high-RPM abuse. Compatible with popular models like Yamaha YZ85 (2002-2018), WR250, and YZ250, these Wiseco-engineered components feature CNC-machined crowns for optimal cam shape, ArmorGlide skirt coatings for low friction, and 4032 alloy construction for durability in dusty, aggressive conditions. Whether you're refreshing a youth 85cc 2-stroke or upgrading a 250cc big bore, these kits ensure crisp throttle response, better sealing, and race-ready power without the need for custom boring—perfect for DIY rebuilds or pro-level maintenance.
Shop trusted brands like Wiseco for race-proven quality. Explore related categories such as dirt bike engine for cylinders and valves or dirt bike air and fuel for carburetors and jets.
Top Dirt Bike Piston & Ring Kits
- Wiseco YZ85 2002-2018 Piston Kit with Gaskets PK1202 – 47.50mm forged aluminum piston kit for Yamaha YZ85 2-stroke; includes rings, wrist pin, circlips, bearing, and gaskets for enhanced combustion and throttle response.
- Wiseco 68.00mm Piston Kit with Gaskets Yamaha WR/YZ 250 PK1563 – Complete big bore kit for Yamaha WR250/YZ250; features forged piston, rings, wrist pin, circlips, and top-end gaskets for superior power and sealing.
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 Assembly - Yamaha - +.25 mm 010-871-04K
WSM
$108.22When you're pushing your engine to its limits, a stock piston assembly becomes your bottleneck. The WSM Piston Assembly delivers OEM-quality construction with thermal management features that reduce friction, lower operating temperatures, and unlock...09101985- SKU:
- 09101985
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 75.90 MM
- RIDING STYLE:
- WATERCRAFT
$108.22 -
WSM Piston Assembly - Yamaha - Standard 010-872K
WSM
$110.44A piston assembly is the heart of your engine's power delivery, and choosing the right one directly impacts performance, reliability, and longevity. The WSM Piston Assembly for Yamaha engines delivers OEM-quality construction with engineered...09101986- SKU:
- 09101986
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE SIZE METRIC:
- 75.90 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$110.44 -
WSM Piston Assembly - Yamaha - +.25 mm 010-872-04K
WSM
$141.11Piston durability and heat management directly impact engine longevity and power output, especially in high-stress racing applications. The WSM +.25mm piston assembly delivers OEM-quality construction with proprietary MOS2 skirt coating that reduces...09101987- SKU:
- 09101987
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 75.90 MM
- MODEL:
- ORIGINAL
$141.11 -
WSM Piston Assembly - Yamaha - +.5 mm 010-872-05K
WSM
$151.13Peak engine performance depends on pistons that can withstand extreme combustion pressures while minimizing friction and heat loss. The WSM +.5mm piston assembly delivers OEM-matching quality with engineering refinements—including a proprietary MOS2...09101988- SKU:
- 09101988
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 75.90 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- ORIGINAL
$151.13 -
WSM Piston Assembly - Sea-Doo - Standard 010-818PK
WSM
$98.28A piston assembly is the heart of your Sea-Doo engine—responsible for converting combustion into horsepower and handling extreme thermal stress. This WSM assembly meets or exceeds OEM specifications while incorporating advanced engineering that reduces...09101261- SKU:
- 09101261
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 82.00 MM
$98.28 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-818-05PK
WSM
$98.28A piston assembly is the heart of your engine's combustion cycle—it needs to withstand extreme temperatures and pressures while maintaining precision tolerances. The WSM Piston Assembly for Sea-Doo delivers OEM-equivalent quality with engineering...09101262- SKU:
- 09101262
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 82.00 MM
- UNITS:
- KIT
$98.28 -
WSM Piston Assembly - Sea-Doo - Standard 010-809PK
WSM
$112.59A piston assembly is one of the highest-wear components in your Sea-Doo engine, directly affecting combustion efficiency, power output, and engine longevity. The WSM Standard 010-809PK is engineered to OEM or better specifications with advanced coatings...09101264- SKU:
- 09101264
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- PLATINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
$112.59 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-809-05PK
WSM
$112.59A piston assembly is the core of your engine's combustion cycle—it's where power is generated and lost through heat and friction. The WSM +.5mm piston assembly for Sea-Doo jet skis delivers OEM-quality construction with engineered improvements that...09101265- SKU:
- 09101265
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
- BORE SIZE METRIC:
- 87.91 MM
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
$112.59 -
WSM Piston Assembly - Sea-Doo - +1 mm 010-809-07PK
WSM
$112.59A piston assembly is the heart of your Sea-Doo's combustion chamber—and WSM's +1 mm 010-809-07PK is engineered to deliver measurable gains in power and durability without compromise. The MOS2-coated skirts actively reduce friction and heat dissipation,...09101266- SKU:
- 09101266
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 87.91 MM
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- KIT
$112.59 -
WSM Piston Assembly - Sea-Doo - Standard 010-824PK
WSM
$116.17A piston assembly is the foundation of reliable engine performance—it's where combustion power translates into usable horsepower. The WSM Piston Assembly for Sea-Doo engines delivers OEM-quality construction with measurable improvements in heat...09101267- SKU:
- 09101267
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
$116.17Qty in Cart: 0Quantity:Price:$116.17Subtotal: -
VERTEX Piston Kit - 76.95 mm - Kawasaki KX250F 24165A
VERTEX
$124.95Your KX250F's engine demands a piston that can handle the heat of competitive riding while maintaining the reliability you need for consistent performance. The VERTEX 76.95 mm Piston Kit delivers OEM-level durability with factory-engineered...09104669- SKU:
- 09104669
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$124.95Qty in Cart: 0Quantity:Price:$124.95Subtotal: -
On Sale
Wiseco Piston Kit 95.00 mm Yamaha YZ450F 2006-2009 4694M09500
WISECO
MSRP: $269.95Now: $229.00Was: $269.95If you're rebuilding your YZ450F or pushing higher RPMs on the track, a worn or damaged piston directly kills power and reliability. This Wiseco forged piston kit restores compression, improves throttle response, and delivers the durability needed for...09102919- SKU:
- 09102919
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $269.95Now: $229.00Was: $269.95Qty in Cart: 0Quantity:Price:MSRP: $269.95Now: $229.00Was: $269.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1099
MOOSE RACING
$386.95A quality piston kit is foundational to engine reliability and performance—especially when you're pushing your Yamaha to its limits. The MOOSE Racing MPX1099 delivers the durability and efficiency you need through precision forging and thoughtful...09106516- SKU:
- 09106516
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95Qty in Cart: 0Quantity:Price:$386.95Subtotal: -
On Sale
Wiseco Piston Kit 95.00 mm 12.75:1 Compression Ratio for 2014-2022 Husqvarna FC450 40297M09500
WISECO
MSRP: $288.95Now: $217.00Was: $288.95When you're pushing your FC450 to its limits, stock pistons won't cut it. This Wiseco forged piston kit delivers the strength, precision tolerances, and reliability demanded by serious 4-stroke riders—whether you're attacking the track or tackling...09106542- SKU:
- 09106542
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $288.95Now: $217.00Was: $288.95Qty in Cart: 0Quantity:Price:MSRP: $288.95Now: $217.00Was: $288.95Subtotal: -
JE PISTONS Piston Kit 362953
JE PISTONS
$299.99When you're running professional-grade power, your pistons need to match that commitment. The JE PISTONS 362953 kit is engineered for extreme applications where reliability and performance aren't negotiable—it delivers the strength and precision required...09106543- SKU:
- 09106543
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
$299.99Qty in Cart: 0Quantity:Price:$299.99Subtotal: -
MOOSE RACING Piston Kit - 96.00 mm - Suzuki MP3020
MOOSE RACING
$326.95A quality piston kit is fundamental to reliable top-end performance, and this MOOSE Racing unit delivers the precision and durability that serious builders demand. The X-style forging process provides exceptional strength while keeping reciprocating mass...09106469- SKU:
- 09106469
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MP1034C
MOOSE RACING
$125.95A worn or compromised piston directly limits your engine's ability to maintain compression, power output, and reliability—especially under forced induction or high-RPM racing conditions. The MOOSE RACING 77.00 mm Piston Kit delivers forged strength and...09106472- SKU:
- 09106472
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MP1011
MOOSE RACING
$125.95If you're pushing your Yamaha MP1011 engine to its limits, stock pistons won't cut it. The MOOSE RACING Piston Kit delivers the strength, precision, and durability required for sustained high-performance operation, whether you're on the track or in the...09106473- SKU:
- 09106473
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 97.00 mm - Can-Am MP9014
MOOSE RACING
$125.95A worn or damaged piston directly undermines engine efficiency, responsiveness, and longevity. The MOOSE RACING Piston Kit delivers OEM-quality reliability with forged construction designed to handle sustained high-RPM performance while reducing...09106478- SKU:
- 09106478
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 72.96 mm - Xtrainer 300 MSE24569B
MOOSE RACING
$218.95A piston kit is the heart of your engine's combustion cycle—when it fails or wears, your power output and reliability suffer. The MOOSE Racing 72.96 mm Piston Kit delivers OEM-quality construction with proven durability upgrades, ensuring consistent...09106545- SKU:
- 09106545
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal:
