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 Piston Kit Kawasaki KX450F 2016-2018 8931DA
WOSSNER
$204.00Enhance your Kawasaki KX 450 F's performance with the WOSSNER Piston Kit, meticulously engineered for optimal efficiency and durability. This kit is designed to provide a seamless fit and superior functionality, ensuring your engine runs smoother and...09106164- SKU:
- 09106164
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 96.03 MM
- MODEL:
- STANDARD SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- 95.98 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Piston Kit Kawasaki KX250F 2017-2018 14.0:1 CR 8932DA
WOSSNER
$204.00Elevate your bike's performance with the WOSSNER Piston Kit, specifically designed for the Kawasaki KX 250 F. This premium piston kit combines advanced engineering with high-quality materials, ensuring optimal performance and durability on the track or...09106165- SKU:
- 09106165
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 77.00 MM
$204.00 -
Wossner Piston Kit Kawasaki KX250F 2017-2018 14.0:1 CR 8932DB
WOSSNER
$204.00Enhance your Kawasaki KX 250 F's performance with the WOSSNER Piston Kit, designed for precision and durability. Crafted from premium materials and engineered for optimal efficiency, this piston kit ensures a smoother ride and improved power delivery,...09106166- SKU:
- 09106166
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE - OVERSIZE:
- +0,01 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- PISTON SIZE METRIC:
- 76.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.01 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$204.00 -
Wossner Piston Kit KTM 350 EXC-F 2012-2016 8941DA
WOSSNER
$214.00Elevate your bike's performance with the WOSSNER Piston Kit designed specifically for the KTM EXC-F 350. This high-quality piston kit combines innovative engineering with premium materials to ensure optimal performance and longevity, making it an...09106167- SKU:
- 09106167
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 87.95 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
$214.00 -
Wossner Piston Kit Kawasaki KX450 2019-2023 12.6:1 8958DA
WOSSNER
$204.00Elevate your bike's performance with the WOSSNER Piston Kit, specifically designed for the Kawasaki KX 450. Engineered with precision and crafted from high-quality materials, this piston kit ensures optimal performance, durability, and reduced friction,...09106168- SKU:
- 09106168
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Piston Kit Kawasaki KX450 2019-2023 12.6:1 CR 8958DB
WOSSNER
$204.00Elevate your bike's performance with the WOSSNER Piston Kit, specifically designed for the Kawasaki KX 450. Engineered for durability and efficiency, this piston kit ensures optimal power delivery and reduced friction for an enhanced riding experience. ...09106169- SKU:
- 09106169
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON SIZE METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 96.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Suzuki RM250 1998 Piston Kit 66.34mm 8140DA
WOSSNER
$152.00Experience unmatched performance and reliability with the WOSSNER Piston Kit 8140DA, expertly engineered for 2-stroke engines. This premium kit includes everything you need for a smooth upgrade, featuring advanced materials and innovative design to...09105552- SKU:
- 09105552
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 66.40 MM
- DISPLACEMENT:
- 246 CC
- PISTON SIZE METRIC:
- 66.34 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$152.00 -
Wossner Piston Kit 55.44mm Honda CR125R 1980-1984 8149DA
WOSSNER
$132.00Experience unparalleled performance with the WOSSNER Piston Kit 8149DA, engineered specifically for 2-stroke engines. Crafted from premium materials and designed using advanced computer simulations, this piston kit ensures optimal efficiency and...09105553- SKU:
- 09105553
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 55.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- PISTON SIZE METRIC:
- 55.44 MM
- UNITS:
- KIT
$132.00 -
Wossner Piston Kit Honda CR250R 1984-1985 8156DA
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8156DA, designed specifically for 2-stroke engines. Crafted from high-quality materials and engineered in Germany, this piston kit enhances engine efficiency while minimizing friction and...09105555- SKU:
- 09105555
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 65.94 MM
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$152.00 -
Wossner Honda CR250R 1984-1985 Piston Kit 8156D025
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8156D025, designed specifically for 2-stroke engines. Crafted from premium materials and engineered in Germany, this piston kit ensures optimal efficiency and longevity, making it an...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
$152.00 -
Wossner Piston Kit 66.50 mm for Honda CR250R 1997-2001 8156D050
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8156D050, expertly engineered for 2-stroke engines. This premium kit includes everything you need for a seamless installation, ensuring optimal engine efficiency and longevity. Complete...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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 66.69mm Honda CR250R 1984-1985 8156D075
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8156D075, engineered for 2-stroke engines. This premium kit features a meticulously crafted piston designed to enhance efficiency and reduce friction, ensuring a smoother and quieter ride...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
$150.96Experience superior performance with the WOSSNER Piston Kit 8161DB, expertly engineered for 2-stroke engines. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit is designed to enhance efficiency and reduce friction, ensuring a...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
$150.96 -
Wossner Piston Kit for Honda CR250R 1997-2001 8161DC
WOSSNER
$150.96Experience unparalleled performance with the WOSSNER Piston Kit 8161DC, designed specifically for 2-stroke engines. Crafted from premium materials and engineered for precision, this piston kit enhances your engine's efficiency and longevity while...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
$150.96 -
Wossner Piston Kit Kawasaki KX250 2005-2007 8168DB
WOSSNER
$152.00Elevate your engine's performance with the WOSSNER Piston Kit 8168DB, expertly crafted for 2-stroke applications. This premium piston kit combines advanced engineering with high-quality materials, ensuring optimal efficiency and durability under...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
$152.00 -
Wossner Piston Kit Yamaha IT250 1983 8175D100
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8175D100, meticulously engineered for 2-stroke engines. Crafted from high-quality materials, this piston kit ensures enhanced durability, reduced friction, and optimal engine efficiency,...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
$152.00 -
Wossner Piston Kit 70.44mm Yamaha IT250 1978-1980 YZ250 1976-1979 8179D050
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8179D050, expertly engineered for 2-stroke engines. Crafted from high-quality materials, this piston kit ensures reduced friction and enhanced durability, making it the perfect choice for...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
$152.00 -
Wossner Piston Kit Yamaha YZ250 1976-1979 72mm 8179D200
WOSSNER
$182.00Experience unparalleled performance with the WOSSNER Piston Kit 8179D200, designed for 2-stroke engines. This premium kit includes everything you need for a seamless installation, ensuring enhanced efficiency and reduced friction for a quieter ride...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
$112.00Enhance your engine's performance with the WOSSNER Piston Kit 8197DA, expertly crafted for 2-stroke applications. This kit combines precision engineering and high-quality materials to deliver exceptional durability and efficiency, ensuring a quieter ride...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
$112.00 -
Wossner Piston Kit 57.95mm for 2016-2022 KTM 150 SX 8299DA
WOSSNER
$142.00Elevate your engine's performance with the WOSSNER Piston Kit 8299DA, meticulously engineered for 2-stroke applications. This high-quality kit combines advanced materials and cutting-edge technology to deliver exceptional durability and efficiency,...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
