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 53.96mm for 2000-2003 Suzuki RM125 8061DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8061DB, meticulously engineered for 2-stroke engines. Crafted from premium 4032 T6 forged aluminum alloy, this piston kit ensures optimal durability and efficiency, making it the perfect...09104771- SKU:
- 09104771
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 54.01 MM
- DISPLACEMENT:
- 124 CC
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Honda CR250R 2002-2004 Piston Kit 8066DA
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8066DA, designed specifically for 2-stroke engines. Crafted from high-quality materials, this piston kit enhances engine efficiency while minimizing friction and noise. Engineered in...09104773- SKU:
- 09104773
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
$152.00 -
Wossner Piston Kit 66.35mm Honda CR250R 2002-2004 8066DB
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8066DB, engineered for 2-stroke engines. This premium kit includes everything you need for a complete piston replacement, ensuring optimal power and efficiency. Crafted from high-quality...09104774- SKU:
- 09104774
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 54.45mm for Honda CR125R 1992-2003 8067D050
WOSSNER
$142.00Experience unparalleled performance with the WOSSNER Piston Kit 8067D050, meticulously engineered for 2-stroke engines. This premium kit combines innovative design with advanced materials to enhance your engine's efficiency and longevity, ensuring a...09104775- SKU:
- 09104775
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.50 MM
- PISTON SIZE METRIC:
- 54.45 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$142.00Qty in Cart: 0Quantity:Price:$142.00Subtotal: -
Wossner 53.95mm Piston Kit for Honda CR125R 2000-2003 8067DA
WOSSNER
$142.00Experience unmatched performance with the WOSSNER Piston Kit 8067DA, expertly engineered for high-demand two-stroke applications. Crafted from premium materials, this piston kit ensures optimal efficiency and longevity, making it an essential upgrade for...09104778- SKU:
- 09104778
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON SIZE METRIC:
- 53.95 MM
- TYPE:
- SINGLE RING
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$142.00 -
Wossner 53.97mm Piston Kit for 2000-2003 Honda CR125R 8067DC
WOSSNER
$142.00Experience unparalleled performance with the WOSSNER Piston Kit 8067DC, designed specifically for 2-stroke engines. Crafted with precision engineering and high-quality materials, this piston kit enhances efficiency while minimizing friction and noise...09104780- SKU:
- 09104780
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 125 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.97 MM
- BORE SIZE METRIC:
- 54.02 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
$142.00Qty in Cart: 0Quantity:Price:$142.00Subtotal: -
Wossner Yamaha YZ125 2002-2004 53.96mm Piston Kit 8072DC
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8072DC, designed for 2-stroke engines. Crafted from high-quality materials and engineered in Germany, this piston kit ensures optimal efficiency and durability, making it a perfect choice...09104789- SKU:
- 09104789
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.02 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.96 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit Honda CR125R 2005-2007 8170DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8170DB, designed for 2-stroke engines. Crafted from high-quality materials, this piston kit enhances engine efficiency while minimizing friction and noise, ensuring a smoother ride...09104865- SKU:
- 09104865
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 54.01 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit KTM 125 2007-2025 54.02mm 8174DC
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8174DC, designed specifically for 2-stroke engines. This premium kit combines advanced engineering with high-quality materials to deliver exceptional durability and efficiency, ensuring your...09104871- SKU:
- 09104871
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 53.97 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 125 CC
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +0,02 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 71.94mm 2014-2016 Husqvarna TE300 8250DA
WOSSNER
$192.00Experience unparalleled performance and reliability with the WOSSNER Piston Kit 8250DA, designed specifically for 2-stroke engines. Crafted with precision engineering and advanced materials, this piston kit enhances your engine's efficiency while...09104895- SKU:
- 09104895
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 293 CC
- PISTON SIZE METRIC:
- 71.94 MM
$192.00Qty in Cart: 0Quantity:Price:$192.00Subtotal: -
ATHENA Piston Kit S4F06600002A
ATHENA
$109.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100450- SKU:
- 09100450
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- DISPLACEMENT:
- 198 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE SIZE METRIC:
- 65.94 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
- UNITS:
- KIT
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
ATHENA Piston Kit S4F06600002B
ATHENA
$109.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100451- SKU:
- 09100451
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- BORE SIZE METRIC:
- 65.95 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 198 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- B
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
ATHENA Piston Kit S4F090000050
ATHENA
$273.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09102764- SKU:
- 09102764
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- TYPE:
- REPLACEMENT FORGED PISTON
- PISTON DIAMETER METRIC:
- 89.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE SIZE METRIC:
- 89.96 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$273.95Qty in Cart: 0Quantity:Price:$273.95Subtotal: -
ATHENA Piston Kit S4F07200006A
ATHENA
$259.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09102666- SKU:
- 09102666
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 16.0:1
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
$259.95Qty in Cart: 0Quantity:Price:$259.95Subtotal: -
ATHENA Piston Kit S4F07200006B
ATHENA
$228.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09102667- SKU:
- 09102667
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD SIZE B
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 16.0:1
- PISTON DIAMETER METRIC:
- 71.96 MM
$228.95Qty in Cart: 0Quantity:Price:$228.95Subtotal: -
ATHENA Piston Kit S4F05400017B
ATHENA
$130.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09103892- SKU:
- 09103892
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- PISTON HEAD SHAPE:
- FLAT TOP
- UNITS:
- KIT
- BORE SIZE METRIC:
- 53.96 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- B
$130.95Qty in Cart: 0Quantity:Price:$130.95Subtotal: -
ATHENA Piston Kit S4F05400017C
ATHENA
$130.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09103893- SKU:
- 09103893
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 53.97 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- C
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- FLAT TOP
- UNITS:
- KIT
$130.95Qty in Cart: 0Quantity:Price:$130.95Subtotal: -
ATHENA Piston Kit S4F06640018C
ATHENA
$187.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09103894- SKU:
- 09103894
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 66.36 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- C
- COMPRESSION RATIO IMPERIAL:
- STOCK
- UNITS:
- KIT
$187.95Qty in Cart: 0Quantity:Price:$187.95Subtotal: -
ATHENA Piston Kit S4C04850003B
ATHENA
$119.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09104655- SKU:
- 09104655
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.45 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- TYPE:
- B
- PRODUCT NAME:
- PISTON KIT
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
ATHENA Piston Kit S4F05400011A
ATHENA
$147.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100090- SKU:
- 09100090
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE SIZE METRIC:
- 53.94 MM
- DISPLACEMENT:
- 124 CC
- TYPE:
- A
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
$147.95Qty in Cart: 0Quantity:Price:$147.95Subtotal:
