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 47.46mm for 2003-2007 Honda CR85R 8105DB
WOSSNER
$112.00Experience unparalleled performance with the WOSSNER Piston Kit 8105DB, expertly engineered for 2-stroke engines. Crafted from premium materials, this piston kit enhances your engine's efficiency while ensuring durability and reduced friction for a...09104836- SKU:
- 09104836
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 47.46 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 47.51 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 84.7 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit KTM 85 SX 2003-2025 8147DA
WOSSNER
$112.00Experience superior performance with the WOSSNER Piston Kit 8147DA, designed specifically for high-demand 2-stroke applications. Engineered in Germany, this piston kit combines advanced materials and innovative design to deliver exceptional durability...09104847- SKU:
- 09104847
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PISTON SIZE METRIC:
- 46.95 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- FORGED
$112.00 -
Wossner Piston Kit 46.96mm for KTM 85 SX 2003-2023 8147DB
WOSSNER
$112.00Elevate your engine's performance with the WOSSNER Piston Kit 8147DB, expertly crafted for 2-stroke engines. This premium kit combines cutting-edge engineering with high-quality materials, ensuring enhanced durability, reduced friction, and a quieter...09104848- SKU:
- 09104848
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 46.96 MM
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 47.01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00 -
Wossner Piston Kit KTM 450 SX-F 2013-2022 8873DB
WOSSNER
$244.00Enhance your KTM SXF 450's performance with the WOSSNER Piston Kit, meticulously engineered for optimal power and efficiency. Crafted from premium materials, this piston kit ensures durability and reduced friction, making it an ideal choice for both...09106126- SKU:
- 09106126
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- BORE SIZE METRIC:
- 95.01 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$244.00 -
Wossner Piston Kit Kawasaki KX450F 2013-2014 12.5:1 CR 8890DA
WOSSNER
$204.00Enhance your Kawasaki KX 450 F's performance with the WOSSNER Piston Kit, expertly engineered for optimal power and reliability. This kit includes everything you need for a seamless installation, ensuring your ride delivers exceptional performance and...09106130- SKU:
- 09106130
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$204.00 -
Wossner Piston Kit KTM 450 EXC-F 2021 8898DA
WOSSNER
$214.00Experience enhanced performance and reliability with the WOSSNER Piston Kit, specifically designed for KTM and Husqvarna 2-stroke engines. Crafted from high-quality materials, this piston kit ensures reduced friction and noise, providing a smoother ride...09106131- SKU:
- 09106131
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
$214.00 -
Wossner Piston Kit Yamaha YZ125 1994-1996 53.95mm 8116DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8116DB, designed specifically for 2-stroke engines. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit offers enhanced durability and efficiency, ensuring your engine...09105539- SKU:
- 09105539
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.01 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
$122.00 -
Wossner Piston Kit Yamaha YZ125 1986-1988 55.94mm 8118DA
WOSSNER
$132.00Experience unparalleled performance with the WOSSNER Piston Kit 8118DA, designed specifically for 2-stroke engines. Crafted from premium materials, this piston kit enhances engine efficiency while minimizing friction and noise, ensuring a smoother ride...09105540- SKU:
- 09105540
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 55.94 MM
- TYPE:
- SINGLE RING
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$132.00 -
WSM Piston Assembly - Kawasaki 15F - Standard 010-845K
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101980- SKU:
- 09101980
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 83.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60 -
WSM Piston Assembly - Yamaha - +.5 mm 010-870-05K
WSM
$106.45Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101983- SKU:
- 09101983
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 73.90 MM
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
$106.45 -
WSM Piston Assembly - Yamaha - +.25 mm 010-871-04K
WSM
$110.38Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$110.38 -
WSM Piston Assembly - Yamaha - Standard 010-872K
WSM
$112.19Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$112.19 -
WSM Piston Assembly - Yamaha - +.25 mm 010-872-04K
WSM
$143.93Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$143.93 -
WSM Piston Assembly - Yamaha - +.5 mm 010-872-05K
WSM
$143.93Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$143.93 -
WSM Piston Assembly - Sea-Doo - Standard 010-818PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-818-05PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Assembly - Sea-Doo - Standard 010-809PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-809-05PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - +1 mm 010-809-07PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - Standard 010-824PK
WSM
$110.64Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$110.64
