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
-
VERTEX Piston Kit 24212C
VERTEX
$136.95The VERTEX Piston Kit 24212C delivers the durability and performance precision you need for serious engine builds. Whether you're rebuilding a two-stroke or four-stroke, this kit provides OEM-quality...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
$136.95Qty in Cart: 0Quantity:Price:$136.95Subtotal: -
VERTEX Piston Kit 24212B
VERTEX
$136.95A quality piston kit is the foundation of reliable top-end performance—whether you're rebuilding after wear or upgrading for increased displacement and power. The VERTEX Piston Kit 24212B delivers...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
$136.95 -
VERTEX Piston Kit 24212A
VERTEX
$137.95Whether you're rebuilding a two-stroke or four-stroke engine, piston quality directly impacts reliability, power delivery, and longevity under load. The VERTEX Piston Kit 24212A delivers OEM-grade...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
$137.95 -
VERTEX Piston Kit 24243C
VERTEX
$164.95The VERTEX Piston Kit 24243C delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a worn top end. Built with forged or cast options and finished...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
$164.95 -
VERTEX Piston Kit 24243B
VERTEX
$164.95The VERTEX Piston Kit 24243B delivers the reliability and precision your engine demands, whether you're pushing peak RPMs on the track or fine-tuning your build in the garage. Engineered with...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
$164.95 -
On Sale
Wossner Piston Kit 8656DA for Honda CRF250R 2006-2009
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00Stock pistons can't handle the sustained heat and load demands of racing or high-performance riding. The Wossner 8656DA delivers the durability and precision you need to push your CRF250R to its...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
MSRP: $184.00Now: $174.80Was: $184.00 -
On Sale
Wossner Dual Ring Piston Kit KTM 250 2005-2025 8169DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8169DB piston kit delivers the reliability and precision required for sustained high-rpm performance in your KTM 250 2-stroke. Factory-engineered with 4032 T6 forged aluminum and a...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
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit KTM 250 SX 2005-2020 8169DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The KTM 250 SX demands a piston that can withstand extreme combustion pressures and sustained high RPMs without compromising reliability. Wossner's 8169DA kit delivers exactly that—a...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
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Yamaha YZ125 2005-2019 53.97mm Piston Kit 8160DC
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're pushing a YZ125 to its limits, piston durability and ring seal integrity directly impact throttle response, engine longevity, and race-day reliability. Wossner's 8160DC kit is engineered...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
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250 2002-2004 66.34mm 8088DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8088DA piston kit is engineered for KX250 riders who demand reliable power delivery and engine longevity. A complete OEM-quality replacement, this kit eliminates guesswork with matched...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
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Piston Kit Suzuki RM250 2003-2010 8086DC
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The Wössner Piston Kit 8086DC is engineered to restore or enhance your RM250's performance with precision-manufactured internals that reduce friction and extend engine life. Built from 4032 T6 forged...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
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Suzuki RM250 2003-2010 Piston Kit 8086DB
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The Wossner RM250 piston kit delivers the reliability and durability that 2-stroke racers demand, whether you're pushing hard on the track or maintaining peak performance in the dirt. Factory OEM...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
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
ATHENA Piston Kit S4F08100005B
ATHENA
MSRP: $293.95Now: $265.00Was: $293.95A high-quality piston kit is essential for maintaining engine performance and reliability, whether you're rebuilding after wear or upgrading for increased displacement. The ATHENA Piston Kit...09104194- 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
MSRP: $293.95Now: $265.00Was: $293.95 -
On Sale
ATHENA Piston Kit S4F08100005A
ATHENA
MSRP: $293.95Now: $265.00Was: $293.95A quality piston kit is the foundation of reliable engine performance, directly affecting compression ratio, combustion efficiency, and overall durability under load. The ATHENA Piston Kit...09104193- 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
MSRP: $293.95Now: $265.00Was: $293.95 -
Wiseco Piston Kit Kawasaki KLX650 1993-1995 9.5:1 Compression 40133M10000
WISECO
$239.95When your KLX650's piston shows wear or you're ready to unlock higher compression performance, a quality rebuild kit is essential to maintaining reliability and power delivery. Wiseco's forged piston...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
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
VERTEX Piston Kit 23647A
VERTEX
$289.95A high-performance piston kit demands precision engineering and durability that goes beyond standard OEM specs. The VERTEX Piston Kit 23647A delivers the thermal stability and low-friction...09102572- 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
$289.95 -
VERTEX Piston Kit 23599B
VERTEX
$271.95Whether you're rebuilding a tired engine or upgrading to high-compression performance, the VERTEX Piston Kit 23599B delivers the durability and precision required for sustained high-RPM operation...09102566- SKU:
- 09102566
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED REPLICA
- CYLINDER DIAMETER METRIC:
- 79.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 78.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$271.95 -
VERTEX Piston Kit 23457B
VERTEX
$260.95A worn or damaged top end forces you to choose between a full rebuild and compromised performance—neither acceptable for serious racers and dedicated enthusiasts. The VERTEX Piston Kit 23457B...09102564- SKU:
- 09102564
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PISTON DIAMETER METRIC:
- 71.95 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$260.95Qty in Cart: 0Quantity:Price:$260.95Subtotal: -
On Sale
ATHENA Piston Kit S4F100000190
ATHENA
MSRP: $257.95Now: $232.00Was: $257.95Engine reliability depends on quality internal components, and pistons are the foundation of any high-performance rebuild or refresh. The ATHENA Piston Kit S4F100000190 delivers precision-engineered...09102535- SKU:
- 09102535
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 100.00 MM
- UNITS:
- EACH
MSRP: $257.95Now: $232.00Was: $257.95 -
On Sale
ATHENA Piston Kit S4F04700001A
ATHENA
MSRP: $142.95Now: $129.00Was: $142.95When you're pushing peak RPMs, piston reliability determines whether you finish the race or get sidelined. The ATHENA Piston Kit S4F04700001A delivers the same precision-forged construction and...09102533- SKU:
- 09102533
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 46.96 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- TYPE:
- A
MSRP: $142.95Now: $129.00Was: $142.95Qty in Cart: 0Quantity:Price:MSRP: $142.95Now: $129.00Was: $142.95Subtotal:
