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 - +.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...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...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
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
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...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
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
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...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...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...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
$112.59Qty in Cart: 0Quantity:Price:$112.59Subtotal: -
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...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...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...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...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...09106542- SKU:
- 09106542
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $288.95Now: $217.00Was: $288.95 -
JE PISTONS Piston Kit 362953
JE PISTONS
$314.99When 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...09106543- SKU:
- 09106543
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
$314.99 -
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...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...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...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...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...09106545- SKU:
- 09106545
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
On Sale
Wossner Piston Kit 72.96mm Beta 300 RR 2022-2026 8324DB
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00OEM pistons wear out, but a quality replacement kit restores lost compression and throttle response while preventing catastrophic engine failure. The Wossner 72.96mm piston kit for your Beta 300 RR...09106630- SKU:
- 09106630
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
PROX Piston Kit - 77.96 mm - Kawasaki KX250/KX250X 01.4351.A
PROX
$188.95A worn or damaged piston directly compromises your KX250/KX250X's compression, throttle response, and overall reliability. The PROX 77.96 mm Piston Kit restores factory performance specifications...09106786- SKU:
- 09106786
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
$188.95 -
PROX Piston Kit - 71.94 mm - Beta 01.7398.A
PROX
$221.95When your piston fails, engine performance tanks—and so does your race day. The PROX Piston Kit delivers OEM-equivalent reliability with CNC precision, ensuring consistent compression, proper ring...09106807- SKU:
- 09106807
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$221.95
