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
-
Wössner Piston Kit 53.95mm for KTM SX125 2007-2022 8174DA
WOSSNER
$122.00KTM SX125 riders demand piston kits that survive the rigors of competitive 2-stroke racing without sacrificing reliability or precision. The Wössner 8174DA delivers exactly that—a complete, ready-to-install kit engineered to reduce friction, minimize...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
$122.00When running a 2-stroke at the edge of performance, your piston is ground zero for power delivery and engine longevity. The Wossner 8174DB delivers the precision engineering and material science required to handle sustained high-RPM loads without...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
$122.00 -
Wossner Piston Kit 71.95mm for KTM 300 XC 2008-2011 8250DB
WOSSNER
$192.00When you're pushing a KTM 300 XC to its limits, a worn or stock piston becomes your bottleneck. The Wossner 8250DB is engineered to handle sustained high-load conditions while delivering the reliability and efficiency you need for consistent track...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
$184.00When your CRF250R or CRF250X is pushing peak RPMs, a stock piston simply won't cut it. The Wössner 8587DC delivers the strength and precision engineering you need to handle aggressive riding conditions while maintaining reliability run after run. This...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
$204.00The Wossner 94.95mm Piston Kit delivers the reliability and precision your 2008-2011 KTM 450 EXC-R demands when pushing hard on the track or trail. Built from forged 4032 T6 aluminum and engineered with Finite Element Analysis, this kit minimizes...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
$204.00The Wossner Piston Kit 8707DB delivers the precision engineering and durability your Husaberg FE450 demands, whether you're pushing hard on the track or tackling aggressive trail conditions. Built from 4032 T6 forged aluminum and engineered with FEA...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
$184.00Stock pistons in high-mileage YZ250F engines lose compression and responsiveness, directly impacting your throttle response and top-end power. The Wossner 8712DA delivers the reliability and precision engineering you need to restore—or exceed—factory...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: $187.95Qty in Cart: 0Quantity:Price:MSRP: $187.95Now: $169.00Was: $187.95Subtotal: -
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: $242.95Qty in Cart: 0Quantity:Price:MSRP: $242.95Now: $219.00Was: $242.95Subtotal: -
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: $89.95Qty in Cart: 0Quantity:Price:MSRP: $89.95Now: $81.00Was: $89.95Subtotal: -
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 -
On Sale
ATHENA Piston Kit S4F05400011B
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...09100091- SKU:
- 09100091
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 124 CC
- TYPE:
- B
- BORE SIZE METRIC:
- 53.95 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- ENGINE TYPE:
- 2-STROKE
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $147.95Now: $133.00Was: $147.95Qty in Cart: 0Quantity:Price:MSRP: $147.95Now: $133.00Was: $147.95Subtotal:
