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 53.95mm Honda CR125R 2005-2007 8170DA
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8170DA, meticulously engineered for 2-stroke engines. This premium piston kit combines advanced materials and innovative design to enhance your engine's efficiency and longevity. Elevate...09104864- SKU:
- 09104864
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
$122.00 -
Wössner Piston Kit 53.95mm for KTM SX125 2007-2022 8174DA
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8174DA, meticulously engineered for 2-stroke engines. This premium kit includes everything you need for optimal engine efficiency, featuring a robust design that minimizes friction and...09104869- SKU:
- 09104869
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
$122.00 -
Wossner Dual Ring Piston Kit KTM 125 SX 2007-2025 54.01mm 8174DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8174DB, expertly crafted for 2-stroke engines. This high-quality piston kit enhances engine efficiency and longevity, ensuring a smooth and powerful ride. Designed with precision...09104870- SKU:
- 09104870
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 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:
- 54.01 MM
- DISPLACEMENT:
- 125 CC
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 71.95mm for KTM 300 XC 2008-2011 8250DB
WOSSNER
$192.00Elevate your engine's performance with the WOSSNER Piston Kit 8250DB, designed for those who demand reliability and efficiency. Crafted from high-quality materials and featuring advanced engineering techniques, this piston kit ensures optimal performance...09104896- SKU:
- 09104896
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.95 MM
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 72.01 MM
- DISPLACEMENT:
- 293 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$192.00Qty in Cart: 0Quantity:Price:$192.00Subtotal: -
Wossner Piston Kit 77.97mm Honda CRF250R 2004-2005 CRF250X 2004-2017 8587DC
WOSSNER
$184.00Elevate your engine's performance with the WOSSNER Piston Kit 8587DC, designed for 2-stroke engines. Crafted from high-quality materials and engineered for precision, this piston kit ensures optimal performance, reduced friction, and enhanced durability,...09104940- SKU:
- 09104940
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 77.97 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 78.02 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
$184.00 -
Wossner 94.95mm Piston Kit for 2008-2011 KTM 450 EXC-R 8707DA
WOSSNER
$204.00Elevate your engine's performance with the WOSSNER Piston Kit 8707DA, designed for 2-stroke applications. This premium piston kit combines advanced engineering with high-quality materials, ensuring optimal performance, durability, and reduced friction...09104969- SKU:
- 09104969
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Piston Kit 94.96mm 11.9:1 Husaberg FE450 2009-2012 8707DB
WOSSNER
$204.00Experience superior performance with the WOSSNER Piston Kit 8707DB, engineered for 2-stroke engines. Crafted from high-quality materials, this piston kit ensures enhanced durability and reduced friction, providing a quieter ride and improved efficiency...09104970- SKU:
- 09104970
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 95.01 MM
- PISTON SIZE METRIC:
- 94.96 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Yamaha YZ250F 2008-2013 Piston Kit 8712DA
WOSSNER
$184.00Enhance your engine's performance with the WOSSNER Piston Kit 8712DA, meticulously crafted for optimal efficiency and durability. This high-quality kit is engineered to minimize friction and noise, ensuring a smoother ride and improved engine response...09104972- SKU:
- 09104972
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 76.96 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
On Sale
ATHENA Piston Kit - Yamaha/Malaguti S4C04760006A
ATHENA
MSRP: $61.95Now: $56.00Was: $61.95Piston kits include piston, rings, wrist pin, and circlips09100581- SKU:
- 09100581
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 47.66 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
MSRP: $61.95Now: $56.00Was: $61.95 -
On Sale
ATHENA Piston Kit S4F06640018A
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...09100627- SKU:
- 09100627
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- BORE SIZE METRIC:
- 66.34 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- A
- ENGINE TYPE:
- 2-STROKE
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $187.95Now: $169.00Was: $187.95 -
On Sale
ATHENA Piston Kit S4F06640019A
ATHENA
MSRP: $173.95Now: $157.00Was: $173.95Two-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...09100641- SKU:
- 09100641
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE METRIC:
- 66.34 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 249 CC
- TYPE:
- A
MSRP: $173.95Now: $157.00Was: $173.95Qty in Cart: 0Quantity:Price:MSRP: $173.95Now: $157.00Was: $173.95Subtotal: -
On Sale
ATHENA Piston Kit S5F08200001A
ATHENA
MSRP: $245.95Now: $221.00Was: $245.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09100646- SKU:
- 09100646
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PISTON DIAMETER METRIC:
- 81.95 MM
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PRODUCT NAME:
- PISTON
- COMPRESSION RATIO IMPERIAL:
- 13.1:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $245.95Now: $221.00Was: $245.95 -
On Sale
ATHENA Piston Kit S4C05800001A
ATHENA
MSRP: $242.95Now: $219.00Was: $242.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09100648- SKU:
- 09100648
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- STYLE:
- BIG BORE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 57.94 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $242.95Now: $219.00Was: $242.95 -
On Sale
ATHENA Piston Kit S4C04850001B
ATHENA
MSRP: $89.95Now: $81.00Was: $89.95Two-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...09101418- SKU:
- 09101418
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.46 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- B
MSRP: $89.95Now: $81.00Was: $89.95 -
On Sale
ATHENA Piston S4C05400016A
ATHENA
MSRP: $185.95Now: $167.00Was: $185.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09100669- SKU:
- 09100669
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 14.8:1
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD BORE
MSRP: $185.95Now: $167.00Was: $185.95 -
On Sale
ATHENA Piston Kit S4C05000002A
ATHENA
MSRP: $100.95Now: $91.00Was: $100.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09101328- SKU:
- 09101328
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- PISTON DIAMETER METRIC:
- 49.95 MM
- PRODUCT NAME:
- PISTON
- COMPRESSION RATIO IMPERIAL:
- 15.0:1
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD SIZE A
MSRP: $100.95Now: $91.00Was: $100.95 -
On Sale
ATHENA Piston Kit S4F08200005A
ATHENA
MSRP: $277.95Now: $250.00Was: $277.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09103414- SKU:
- 09103414
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
- PISTON SIZE METRIC:
- STANDARD SIZE A
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 81.95 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 16.0:1
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
MSRP: $277.95Now: $250.00Was: $277.95Qty in Cart: 0Quantity:Price:MSRP: $277.95Now: $250.00Was: $277.95Subtotal: -
On Sale
ATHENA Piston Kit S4F05400017A
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...09103891- SKU:
- 09103891
- 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
- TYPE:
- A
- BORE SIZE METRIC:
- 53.95 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- 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 S4C04750005A
ATHENA
MSRP: $124.95Now: $112.00Was: $124.95Two-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...09310976- SKU:
- 09310976
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- B
- BORE SIZE METRIC:
- 47.45 MM
MSRP: $124.95Now: $112.00Was: $124.95 -
On Sale
ATHENA Piston Kit S4F05400003B
ATHENA
MSRP: $167.95Now: $151.00Was: $167.95Two-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...09100067- SKU:
- 09100067
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- DISPLACEMENT:
- 125 CC
- BORE SIZE METRIC:
- 53.96 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 124 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- B
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $167.95Now: $151.00Was: $167.95
