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 Husqvarna TC 510 2006-2009 96.96mm 8652DB
WOSSNER
$234.00A worn or damaged piston directly kills engine performance and reliability—and replacing it with a substandard part only delays the problem. The Wossner Piston Kit for your Husqvarna TC 510 is engineered to OEM specifications with materials and precision...09106119- SKU:
- 09106119
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- BORE - OVERSIZE:
- +0,01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 96.96 MM
- BORE SIZE METRIC:
- 97.01 MM
- MODEL:
- PRO SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.01 MM
$234.00Qty in Cart: 0Quantity:Price:$234.00Subtotal: -
Wossner Piston Kit Yamaha YZ450F 2010-2013 12.5:1 CR 8776DA
WOSSNER
$204.00The Wossner Piston Kit delivers the durability and precision your YZ450F demands, whether you're pushing hard at the track or logging hours in the dirt. Factory pistons wear, lose compression, and rob you of throttle response—this complete kit restores...09106121- SKU:
- 09106121
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 97.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 96.96 MM
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Kit Yamaha YZ450F 2010-2013 12.5:1 8776DB
WOSSNER
$204.00Engine wear and heat stress are the primary culprits behind power loss and reliability issues in high-performance 4-strokes. The Wossner Piston Kit for your YZ450F addresses both with precision-engineered components that restore combustion efficiency,...09106122- SKU:
- 09106122
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 96.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 97.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$204.00 -
Wossner Piston Kit Yamaha YFZ450R 2009-2025 12.5:1 CR 8784DA
WOSSNER
$204.00When you're pushing the YFZ450R to its limits, factory pistons become your weak link. The Wossner 8784DA is purpose-built to handle the demands of high-RPM riding while delivering measurable gains in reliability and throttle response. This is the piston...09106123- SKU:
- 09106123
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- ATV
$204.00 -
Wossner Piston Kit KTM 450 SX-F 2013-2022 8868DA
WOSSNER
$214.00Stock pistons are the weak link in high-performance 450 applications—especially when you're pushing near redline on a regular basis. The Wössner 8868DA is engineered to withstand the extreme combustion pressures and thermal cycling that separates casual...09106124- SKU:
- 09106124
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit KTM 450 SX-F 2013-2023 94.95mm 8873DA
WOSSNER
$244.00A high-performance piston kit is the foundation of reliable top-end durability and consistent power delivery in your KTM 450 SX-F. The Wossner 8873DA combines German engineering with proven materials science to eliminate piston rock, reduce friction...09106125- SKU:
- 09106125
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$244.00 -
Wossner Piston Kit Husqvarna FC250 2016-2022 8923DA
WOSSNER
$224.00When you're pushing your FC250 to the limit, a stock piston won't cut it. The Wössner Piston Kit delivers the durability and precision your engine demands, combining German engineering with race-proven materials to keep power consistent lap after lap...09106134- SKU:
- 09106134
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON SIZE METRIC:
- 77.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$224.00 -
Wossner Piston Kit KTM 350 EXC-F 2017-2019 Husqvarna FE350 2017-2019 12.5:1 CR 8941DB
WOSSNER
$214.00When your KTM 350 EXC-F or Husqvarna FE350 is pushing hard on the track or trail, piston reliability becomes non-negotiable. This Wossner piston kit delivers the durability and precision engineering needed to withstand high-load conditions while reducing...09106136- SKU:
- 09106136
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 88.01 MM
- PISTON SIZE METRIC:
- 87.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
$214.00 -
Wossner Piston Kit Yamaha YZ250F 2019-2025 8957DA
WOSSNER
$184.00The stock piston in your YZ250F won't cut it if you're pushing hard on the track or trail. Wossner pistons are engineered for high-load durability and reduced friction, giving you reliable power delivery lap after lap. This complete kit gives you...09106138- SKU:
- 09106138
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
$184.00 -
Wossner Piston Kit Yamaha YZ250F 2019-2025 8957DB
WOSSNER
$184.00The Wossner Piston Kit delivers the durability and precision needed to keep your YZ250F running strong through aggressive riding and repeated heat cycles. Built with German engineering and advanced metallurgy, this complete kit eliminates guesswork...09106139- SKU:
- 09106139
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 77.01 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.97 MM
$184.00 -
Wossner Piston Kit Yamaha YZ450F 2020-2022 8965DA
WOSSNER
$224.00If you're running hard on the track or pushing your YZ450F to its limits in competition, piston durability and throttle response are non-negotiable. The Wossner Piston Kit delivers the precision engineering and material science that separates competitive...09106142- SKU:
- 09106142
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 96.96 MM
- PRODUCT NAME:
- PISTON KIT
$224.00Qty in Cart: 0Quantity:Price:$224.00Subtotal: -
Wossner Piston Kit Yamaha YZ450F 2003-2004 8562DA
WOSSNER
$194.00If you're running a YZ450F hard—whether on the track or in practice—piston failure isn't an option. The Wossner 8562DA gives you the durability and reliability needed to push your bike to its limits without compromise. Built with German engineering and...09106148- SKU:
- 09106148
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$194.00 -
Wossner Piston Kit Suzuki RM-Z450 2013-2025 12.5:1 CR 8886DB
WOSSNER
$204.00When you're pushing your RM-Z450 to the limit, factory pistons become your weakest link. The Wossner 12.5:1 Compression Ratio Piston Kit delivers the durability and precision engineering needed to handle aggressive riding and high-RPM demands, while the...09106152- SKU:
- 09106152
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 95.51 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.47 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Piston Kit Honda CRF450R 2009-2012 13.4:1 8768DA
WOSSNER
$214.00A worn or stock piston limits your CRF450R's ability to maintain consistent power under load, leading to increased blow-by and reduced efficiency. The Wössner 8768DA replaces those limitations with a precision-engineered forged piston that delivers...09106153- SKU:
- 09106153
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit Honda CRF 450 R 2013-2014 8880DA
WOSSNER
$204.00The stock piston in your Honda CRF 450 R can become a limitation when you're pushing harder on the track or trail. Wossner's purpose-built piston kit delivers the strength and reliability needed for sustained high-performance riding, with engineering...09106154- SKU:
- 09106154
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Kit Honda CRF450R 2017-2025 95.95mm 13.5:1 8936DA
WOSSNER
$204.00The Wossner Piston Kit is engineered to restore or exceed your CRF450R's power output while delivering the durability required for sustained high-RPM operation. A complete piston replacement addresses wear that reduces compression, throttle response, and...09106157- SKU:
- 09106157
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.95 MM
$204.00 -
PROX Piston Kit 01.1113.B
PROX
$99.95A piston kit is critical to engine reliability and performance—worn or damaged pistons compromise compression, increase blow-by, and accelerate engine degradation. The PROX Piston Kit 01.1113.B delivers OEM-equivalent durability with precision...09100020- SKU:
- 09100020
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 47.45 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD SIZE B
- PISTON DIAMETER METRIC:
- 47.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$99.95 -
PROX Piston Kit 01.1113.C
PROX
$99.95Whether you're rebuilding a tired engine or replacing worn pistons, the PROX Piston Kit 01.1113.C delivers the precision and reliability that professional rebuilds demand. Engineered as a direct OEM replacement with Japanese manufacturing standards, this...09100021- SKU:
- 09100021
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 47.46 MM
- PISTON SIZE METRIC:
- STANDARD SIZE C
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 47.46 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
$99.95 -
PROX Piston Kit 01.4022.A
PROX
$88.95Worn or damaged pistons compromise combustion efficiency, reduce power output, and risk catastrophic engine failure. The PROX Piston Kit 01.4022.A delivers OEM-equivalent performance with precision engineering, ensuring reliable ring sealing, proper bore...09100022- SKU:
- 09100022
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 44.45 MM
- PISTON DIAMETER METRIC:
- 42.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
$88.95 -
PROX Piston Kit 01.4022.B
PROX
$88.95When your engine demands reliability under extreme conditions, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.4022.B delivers factory-quality performance with the precision tolerances required for high-RPM stability and consistent...09100023- SKU:
- 09100023
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 44.46 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 44.46 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- RIDING STYLE:
- OFF-ROAD
$88.95
