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
-
Wossner Honda CR250R 1984-1985 Piston Kit 8156D025
WOSSNER
$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 components—piston, rings, pin, and clips—ready for...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 66.50 mm for Honda CR250R 1997-2001 8156D050
WOSSNER
$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 engineering you need to restore—or exceed—factory performance...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
$152.00 -
Wossner Piston Kit 66.69mm Honda CR250R 1984-1985 8156D075
WOSSNER
$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 precision-forged piston kit engineered to handle the extreme...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Honda CR250R 1997-2001 Piston Kit 8161DB
WOSSNER
$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 finite element analysis, this kit eliminates the...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
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
Wossner Piston Kit for Honda CR250R 1997-2001 8161DC
WOSSNER
$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 on the track or trail. Built with German precision and...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
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
Wossner Piston Kit Kawasaki KX250 2005-2007 8168DB
WOSSNER
$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 after lap without compromise. This complete kit gives...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Yamaha IT250 1983 8175D100
WOSSNER
$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 replaces worn compression with a complete, engineered...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 70.44mm Yamaha IT250 1978-1980 YZ250 1976-1979 8179D050
WOSSNER
$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 RPMs, and sustained load—all while reducing friction and...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Yamaha YZ250 1976-1979 72mm 8179D200
WOSSNER
$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. This complete OEM-style replacement kit eliminates...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
$182.00 -
Wossner Piston Kit Kawasaki KX80 1988-2000 47.95mm 8197DA
WOSSNER
$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 necessary to maintain peak power output while reducing...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
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit 57.95mm for 2016-2022 KTM 150 SX 8299DA
WOSSNER
$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 demands, combining German engineering with advanced...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
$142.00 -
Wossner Yamaha YZ65 2018-2025 Piston Kit 8306DA
WOSSNER
$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 German-made piston delivers the precision fit and...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
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit 67.34mm Kawasaki KX250 1987-1989 8129DA
WOSSNER
$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 that separates competitive builds from the rest. This...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
$162.00Qty in Cart: 0Quantity:Price:$162.00Subtotal: -
Wossner Piston Kit 55.94mm Kawasaki KX125 1988-1989 8130DA
WOSSNER
$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 separates competitive riders from the rest—engineered in...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
$132.00Qty in Cart: 0Quantity:Price:$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 measurable upgrades: a MOS2-coated skirt that actively...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 Sea-Doo delivers OEM-equivalent or superior quality with...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
$143.47 -
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 performance upgrades, including a proprietary MOS2...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 specifications while adding engineering refinements that...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 construction with engineering refinements that reduce...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 durability features that extend engine life while unlocking...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
