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
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On Sale
ATHENA Piston Kit S4F06600002A
ATHENA
MSRP: $109.95Now: $99.00Was: $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
MSRP: $109.95Now: $99.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $99.00Was: $109.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06600002B
ATHENA
MSRP: $109.95Now: $99.00Was: $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
MSRP: $109.95Now: $99.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $99.00Was: $109.95Subtotal: -
On Sale
ATHENA Piston Kit S4F090000050
ATHENA
MSRP: $273.95Now: $247.00Was: $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
MSRP: $273.95Now: $247.00Was: $273.95Qty in Cart: 0Quantity:Price:MSRP: $273.95Now: $247.00Was: $273.95Subtotal: -
On Sale
ATHENA Piston Kit S4F07200006A
ATHENA
MSRP: $259.95Now: $234.00Was: $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
MSRP: $259.95Now: $234.00Was: $259.95Qty in Cart: 0Quantity:Price:MSRP: $259.95Now: $234.00Was: $259.95Subtotal: -
On Sale
ATHENA Piston Kit S4F07200006B
ATHENA
MSRP: $228.95Now: $206.00Was: $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
MSRP: $228.95Now: $206.00Was: $228.95Qty in Cart: 0Quantity:Price:MSRP: $228.95Now: $206.00Was: $228.95Subtotal: -
On Sale
ATHENA Piston Kit S4F05400017B
ATHENA
MSRP: $130.95Now: $118.00Was: $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
MSRP: $130.95Now: $118.00Was: $130.95Qty in Cart: 0Quantity:Price:MSRP: $130.95Now: $118.00Was: $130.95Subtotal: -
On Sale
ATHENA Piston Kit S4F05400017C
ATHENA
MSRP: $130.95Now: $118.00Was: $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
MSRP: $130.95Now: $118.00Was: $130.95Qty in Cart: 0Quantity:Price:MSRP: $130.95Now: $118.00Was: $130.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06640018C
ATHENA
MSRP: $187.95Now: $169.00Was: $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
MSRP: $187.95Now: $169.00Was: $187.95Qty in Cart: 0Quantity:Price:MSRP: $187.95Now: $169.00Was: $187.95Subtotal: -
On Sale
ATHENA Piston Kit S4C04850003B
ATHENA
MSRP: $119.95Now: $108.00Was: $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
MSRP: $119.95Now: $108.00Was: $119.95Qty in Cart: 0Quantity:Price:MSRP: $119.95Now: $108.00Was: $119.95Subtotal: -
On Sale
ATHENA Piston Kit S4F05400011A
ATHENA
MSRP: $147.95Now: $133.00Was: $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
MSRP: $147.95Now: $133.00Was: $147.95Qty in Cart: 0Quantity:Price:MSRP: $147.95Now: $133.00Was: $147.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06400001A
ATHENA
MSRP: $1,140.95Now: $1,027.00Was: $1,140.95Two-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...09100103- SKU:
- 09100103
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 63.94 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
- DISPLACEMENT:
- 200 CC
MSRP: $1,140.95Now: $1,027.00Was: $1,140.95Qty in Cart: 0Quantity:Price:MSRP: $1,140.95Now: $1,027.00Was: $1,140.95Subtotal: -
Wossner Piston Kit 66.36mm Honda CR250R 2002-2004 8066DC
WOSSNER
$150.96Elevate your engine's performance with the WOSSNER Piston Kit 8066DC, designed for 2-stroke applications. This premium piston kit combines cutting-edge engineering with high-quality materials to ensure optimal performance and longevity, making it the...09105501- SKU:
- 09105501
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$150.96 -
Wossner Piston Kit 53.95mm Kawasaki KX125 2003 8073DA
WOSSNER
$122.00Elevate your engine's performance with the WOSSNER Piston Kit 8073DA, designed specifically for 2-stroke applications. Crafted from high-quality materials and engineered in Germany, this piston kit ensures durability and efficiency, providing a...09105503- SKU:
- 09105503
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
JE PISTONS Piston Kit 132699
JE PISTONS
$269.99If you're building an engine for the track, your pistons need to survive extreme pressures, high RPM loads, and unforgiving competition environments. JE PISTONS' 2618-T6 forged aluminum construction delivers the strength and reliability that separates...09105837- SKU:
- 09105837
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON HEAD SHAPE:
- DOMED
- STYLE:
- JE PISTON
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 406 CC
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 86.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.6:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$269.99 -
JE PISTONS Piston Kit 247607
JE PISTONS
$309.99When you're pushing your engine to the limit in professional competition, piston failure isn't an option—it's a catastrophe. JE PISTONS 247607 kits are purpose-built for extreme applications where standard pistons simply can't survive the thermal stress...09105852- SKU:
- 09105852
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- PRO SERIES
- UNITS:
- KIT
- TYPE:
- FORGED SIDE RELIEF DESIGN
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- PISTON HEAD SHAPE:
- DOMED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$309.99Qty in Cart: 0Quantity:Price:$309.99Subtotal: -
JE PISTONS Piston Kit 300277
JE PISTONS
$269.99When you're pushing your engine to the absolute limit, your pistons need to handle extreme pressures and temperatures without compromise. JE Pistons' Pro Series 300277 kit delivers the precision engineering and materials science required for professional...09105914- SKU:
- 09105914
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 102.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- DISPLACEMENT:
- 657 CC
- PISTON HEAD SHAPE:
- FLAT TOP
$269.99Qty in Cart: 0Quantity:Price:$269.99Subtotal: -
VERTEX Piston Kit 23119200
VERTEX
$177.95Whether you're rebuilding a two-stroke or four-stroke engine, piston selection directly impacts compression ratio, durability under load, and overall power delivery. VERTEX Piston Kit 23119200 delivers OEM-grade reliability with forged construction...09103344- SKU:
- 09103344
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 135 CC
- STYLE:
- CAST BIG BORE
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
VERTEX Piston Kit with Gaskets VTK22795B
VERTEX
$289.95High-compression forged pistons are essential for unlocking additional power and torque across your engine's entire RPM range—especially if you're building for sustained performance or forced induction applications. The VERTEX VTK22795B kit combines...09103363- SKU:
- 09103363
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit with Gaskets VTK22520B
VERTEX
$208.95A quality piston kit is fundamental to reliable engine performance, especially under high-load conditions where OEM components often fall short. The VERTEX VTK22520B delivers forged construction with advanced surface treatments that reduce friction...09103379- SKU:
- 09103379
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$208.95 -
VERTEX Piston Kit VTK23004B
VERTEX
$223.95Whether you're building a high-RPM engine or refreshing a tired block, VERTEX pistons deliver the durability and precision needed for sustained performance. The T-5 heat treatment cycle ensures these pistons handle extreme combustion pressures without...09103073- SKU:
- 09103073
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
$223.95
