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 1984-1985 Kawasaki KX80 8201DA
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8201DA, designed specifically for 2-stroke engines. Engineered with precision and crafted from high-quality materials, this piston kit enhances your engine's efficiency while ensuring...09105574- SKU:
- 09105574
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 47.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 82 CC
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
VERTEX Piston Kit 24220A
VERTEX
$269.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105189- SKU:
- 09105189
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- DISPLACEMENT:
- 250 CC
$269.95 -
VERTEX Piston Kit 24244C
VERTEX
$232.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105169- SKU:
- 09105169
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.945 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$232.95 -
VERTEX Piston Kit 24244A
VERTEX
$235.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105167- SKU:
- 09105167
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.925 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$235.95 -
VERTEX Piston Kit 24212C
VERTEX
$126.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105165- SKU:
- 09105165
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.96 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PRODUCT NAME:
- PISTON KIT
$126.95 -
VERTEX Piston Kit 24212B
VERTEX
$126.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105164- SKU:
- 09105164
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$126.95 -
VERTEX Piston Kit 24212A
VERTEX
$127.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105163- SKU:
- 09105163
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PRODUCT NAME:
- PISTON KIT
$127.95 -
VERTEX Piston Kit 24243C
VERTEX
$152.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105161- SKU:
- 09105161
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.96 MM
- STYLE:
- CAST RACE
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$152.95 -
VERTEX Piston Kit 24243B
VERTEX
$152.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105160- SKU:
- 09105160
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- STREET
- STYLE:
- CAST RACE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
$152.95 -
Wossner Piston Kit 8656DA for Honda CRF250R 2006-2009
WOSSNER
$184.00Experience unparalleled performance with the WOSSNER Piston Kit 8656DA, designed for serious enthusiasts and racers alike. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit ensures durability and efficiency, providing a significant...09104960- SKU:
- 09104960
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 77.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
$184.00 -
Wossner Dual Ring Piston Kit KTM 250 2005-2025 8169DB
WOSSNER
$152.00Experience unparalleled performance and reliability with the WOSSNER Piston Kit 8169DB, designed specifically for 2-stroke engines. Crafted from high-quality materials, this piston kit enhances engine efficiency while minimizing friction and noise. With...09104862- SKU:
- 09104862
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00 -
Wossner Piston Kit KTM 250 SX 2005-2020 8169DA
WOSSNER
$152.00Experience unparalleled performance and reliability with the WOSSNER Piston Kit 8169DA, designed specifically for 2-stroke engines. Crafted from premium materials and engineered with precision, this piston kit ensures optimal efficiency and durability,...09104861- SKU:
- 09104861
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- TYPE:
- DUAL RING
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Yamaha YZ125 2005-2019 53.97mm Piston Kit 8160DC
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8160DC, expertly crafted for 2-stroke engines. This premium kit is designed to enhance your engine's efficiency and longevity, featuring advanced materials and engineering techniques that...09104855- SKU:
- 09104855
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 53.97 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00 -
Wossner Piston Kit Kawasaki KX250 2002-2004 66.34mm 8088DA
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8088DA, designed specifically for 2-stroke engines. Crafted from high-quality materials, this kit ensures reduced friction and noise, enhancing your engine's efficiency and longevity. With...09104809- SKU:
- 09104809
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PISTON SIZE METRIC:
- 66.34 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$152.00 -
Wossner Piston Kit Suzuki RM250 2003-2010 8086DC
WOSSNER
$122.00Experience unmatched performance with the WOSSNER Piston Kit 8086DC, expertly engineered for 2-stroke engines. Crafted from high-quality materials, this piston kit is designed to enhance your engine's efficiency, reduce friction, and ensure a quieter...09104808- SKU:
- 09104808
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- PISTON SIZE METRIC:
- 66.36 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$122.00 -
Wossner Suzuki RM250 2003-2010 Piston Kit 8086DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8086DB, designed for 2-stroke engines. Crafted from high-quality materials and engineered in Germany, this piston kit ensures optimal efficiency and longevity, making it the perfect upgrade...09104807- SKU:
- 09104807
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON SIZE METRIC:
- 66.35 MM
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
ATHENA Piston Kit S4F08100005B
ATHENA
$293.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09104194- SKU:
- 09104194
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON DIAMETER METRIC:
- 80.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
$293.95 -
ATHENA Piston Kit S4F08100005A
ATHENA
$293.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09104193- SKU:
- 09104193
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PISTON DIAMETER METRIC:
- 80.95 MM
- PRODUCT NAME:
- PISTON
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD SIZE A
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$293.95 -
Wiseco Piston Kit Kawasaki KLX650 1993-1995 9.5:1 Compression 40133M10000
WISECO
$239.95Wiseco 40133M10000 Piston Kit Elevate your Kawasaki KLX650 or KLX650R's performance with the Wiseco 40133M10000 Piston Kit. Designed for enthusiasts and competitive riders, this kit ensures unmatched durability and peak power, enabling you to tackle any...09103949- SKU:
- 09103949
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 100.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.5:1
- DISPLACEMENT:
- 644 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
$239.95 -
VERTEX Piston Kit 23647A
VERTEX
$268.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09102572- SKU:
- 09102572
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
$268.95
