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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On Sale
Wossner Honda CR250R 1984-1985 Piston Kit 8156D025
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8156D025 piston kit delivers the precision engineering and durability required for sustained high-RPM performance in your Honda CR250R. This complete kit eliminates guesswork with matched...09105556- SKU:
- 09105556
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 66.25 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.19 MM
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Piston Kit 66.50 mm for Honda CR250R 1997-2001 8156D050
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00When you're rebuilding a CR250R engine, piston quality directly impacts throttle response, reliability, and how long your engine stays in the game. The Wossner 8156D050 delivers the precision...09105557- SKU:
- 09105557
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.50 MM
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.44 MM
- PRODUCT NAME:
- PISTON KIT
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 66.69mm Honda CR250R 1984-1985 8156D075
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00Stock pistons are a wear item in 2-stroke engines, and when yours fails, you lose compression, power, and reliability. The Wossner 8156D075 restores your CR250R to peak performance with a...09105558- SKU:
- 09105558
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.75 MM
- BORE - OVERSIZE:
- +0,75 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.69 MM
- BORE - OVERSIZE METRIC:
- +0.75 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Honda CR250R 1997-2001 Piston Kit 8161DB
WOSSNER
MSRP: $150.96Now: $143.41Was: $150.96The Wossner 8161DB piston kit delivers the precision engineering your 2-stroke CR250R demands for consistent power delivery and extended engine life. Purpose-built with German forging expertise and...09105564- SKU:
- 09105564
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
MSRP: $150.96Now: $143.41Was: $150.96Qty in Cart: 0Quantity:Price:MSRP: $150.96Now: $143.41Was: $150.96Subtotal: -
On Sale
Wossner Piston Kit for Honda CR250R 1997-2001 8161DC
WOSSNER
MSRP: $150.96Now: $143.41Was: $150.96Your CR250R's performance is only as strong as its core. Wossner's 8161DC piston kit delivers the thermal stability and reduced friction your 2-stroke engine demands during aggressive riding, whether...09105565- SKU:
- 09105565
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE METRIC:
- +0.02 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,02 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
MSRP: $150.96Now: $143.41Was: $150.96Qty in Cart: 0Quantity:Price:MSRP: $150.96Now: $143.41Was: $150.96Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250 2005-2007 8168DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00When you're pushing a KX250 to its limits, factory pistons won't cut it. The Wossner 8168DB delivers the strength, heat resistance, and precision engineering you need to maintain peak performance lap...09105566- SKU:
- 09105566
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha IT250 1983 8175D100
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00If you're rebuilding a 1983 Yamaha IT250 or pushing this classic 2-stroke to its limits, piston quality directly impacts reliability, power delivery, and engine longevity. The Wossner 8175D100 kit...09105568- SKU:
- 09105568
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 68.94 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Piston Kit 70.44mm Yamaha IT250 1978-1980 YZ250 1976-1979 8179D050
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00When you're pushing a 2-stroke to its limits, stock pistons become your bottleneck. The Wossner 8179D050 kit delivers the strength and precision engineering needed to handle aggressive riding, high...09105570- SKU:
- 09105570
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 70.50 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- TYPE:
- DUAL RING
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 70.44 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit Yamaha YZ250 1976-1979 72mm 8179D200
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00The Wossner Piston Kit 8179D200 is engineered specifically for Yamaha YZ250 models from 1976-1979, delivering the precision and durability your 2-stroke demands during aggressive riding conditions...09105571- SKU:
- 09105571
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.94 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $182.00Now: $172.90Was: $182.00 -
On Sale
Wossner Piston Kit Kawasaki KX80 1988-2000 47.95mm 8197DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00Your KX80's longevity depends on a piston that can handle the demands of 2-stroke performance without sacrificing reliability. The Wossner 8197DA delivers the durability and precision engineering...09105572- SKU:
- 09105572
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 47.95 MM
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $112.00Now: $106.40Was: $112.00Qty in Cart: 0Quantity:Price:MSRP: $112.00Now: $106.40Was: $112.00Subtotal: -
On Sale
Wossner Piston Kit 57.95mm for 2016-2022 KTM 150 SX 8299DA
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or stock piston compromises your 150 SX's power delivery and longevity, especially under sustained high-RPM racing loads. The Wossner 8299DA delivers the durability and precision your engine...09105589- SKU:
- 09105589
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 143 CC
- MODEL:
- STANDARD SERIES
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 57.95 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Yamaha YZ65 2018-2025 Piston Kit 8306DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The Wossner YZ65 piston kit is engineered for 2-stroke engines that demand reliability and consistent power delivery. If you're rebuilding after ring wear or preparing for competitive riding, this...09105590- SKU:
- 09105590
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE METRIC:
- 43.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 43.45 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 65 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Piston Kit 67.34mm Kawasaki KX250 1987-1989 8129DA
WOSSNER
MSRP: $162.00Now: $153.90Was: $162.00When you're pushing a 2-stroke KX250 to its limits, piston reliability directly impacts your lap times and engine longevity. The Wossner 8129DA delivers the precision engineering and material quality...09105544- SKU:
- 09105544
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 67.40 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 67.34 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $162.00Now: $153.90Was: $162.00Qty in Cart: 0Quantity:Price:MSRP: $162.00Now: $153.90Was: $162.00Subtotal: -
On Sale
Wossner Piston Kit 55.94mm Kawasaki KX125 1988-1989 8130DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00When you're pushing a KX125 to its limits, piston quality directly determines whether you're winning races or rebuilding engines. The Wossner 8130DA delivers the reliability and power output that...09105546- SKU:
- 09105546
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 55.94 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
WSM Piston Assembly - Kawasaki 12F - Standard 010-844K
WSM
$98.28A piston assembly is the heart of your engine's combustion cycle—when it wears, power fades and reliability suffers. The WSM Piston Assembly for Kawasaki 12F delivers OEM-equivalent quality with...09101978- SKU:
- 09101978
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 83.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$98.28 -
WSM Piston Assembly - Sea-Doo - Standard 010-860PK
WSM
$143.47A piston assembly is the engine's hardworking core—it compresses the fuel-air mixture, converts combustion into power, and dissipates extreme heat cycle after cycle. The WSM Piston Assembly for...09101270- SKU:
- 09101270
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE SIZE METRIC:
- 99.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$143.47Qty in Cart: 0Quantity:Price:$143.47Subtotal: -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-860-05PK
WSM
$143.47A piston assembly is the heart of your engine's combustion cycle—and when it fails or wears, your entire powerplant suffers. The WSM Piston Assembly delivers OEM-equivalent quality with measurable...09101271- SKU:
- 09101271
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 99.96 MM
- MODEL:
- PLATINUM
$143.47Qty in Cart: 0Quantity:Price:$143.47Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-861PK
WSM
$133.96A piston assembly is the heart of your engine's power delivery—when it fails or wears, you lose compression, efficiency, and reliability. The WSM Piston Assembly for Sea-Doo meets or exceeds OEM...09101272- SKU:
- 09101272
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$133.96Qty in Cart: 0Quantity:Price:$133.96Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-862K
WSM
$242.28A piston assembly is critical to your engine's efficiency and reliability—it directly impacts compression, heat management, and power output. The WSM Piston Assembly for Sea-Doo delivers OEM-grade...09101274- SKU:
- 09101274
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$242.28 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-862-05K
WSM
$242.28A high-revving engine demands pistons engineered for sustained performance under extreme conditions. The WSM Piston Assembly delivers OEM-equivalent quality with advanced thermal management and...09101275- SKU:
- 09101275
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$242.28
