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
-
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: -
On Sale
ATHENA Piston Kit S4F06400001B
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95Two-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...09100104- SKU:
- 09100104
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- COMPRESSION RATIO IMPERIAL:
- STOCK
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 63.95 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 200 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- B
MSRP: $162.95Now: $147.00Was: $162.95Qty in Cart: 0Quantity:Price:MSRP: $162.95Now: $147.00Was: $162.95Subtotal: -
Wossner Kawasaki KX125 2000-2002 Piston Kit 8062DA
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8062DA, designed specifically for 2-stroke engines. Crafted from premium materials and engineered for precision, this piston kit enhances efficiency and reduces friction, ensuring a quieter...09105498- SKU:
- 09105498
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Kawasaki KX125 2000-2002 Piston Kit 8062DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8062DB, meticulously engineered for 2-stroke engines. Crafted from premium 4032 T6 forged aluminum alloy, this piston kit enhances your engine's efficiency while minimizing friction for a...09105499- SKU:
- 09105499
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 54.01 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,01 MM
- 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: -
On Sale
Wossner Piston Kit Kawasaki KX125 2001-2002 8062DC
WOSSNER
MSRP: $117.95Now: $78.00Was: $117.95Experience unparalleled performance with the WOSSNER Piston Kit 8062DC, expertly engineered for 2-stroke engines. This premium piston kit is designed to enhance efficiency and reduce friction, ensuring a smoother and quieter ride. Crafted from...09105500- SKU:
- 09105500
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- +0,02 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.97 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $117.95Now: $78.00Was: $117.95 -
MILLENNIUM Piston Kit K8930D500-2
MILLENNIUM
$449.954-stroke pistons are made using a double-bridged forging design, Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine09105034- SKU:
- 09105034
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE SIZE METRIC:
- 98 MM
- PRODUCT NAME:
- PISTON KIT
- RING MATERIAL:
- NITRIDE COATED
- SKIRT COATING:
- MOLY COATED
- STYLE:
- BIG BORE
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PISTON MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- UNITS:
- KIT
$449.95 -
JE PISTONS Piston Kit 345192
JE PISTONS
$839.99When you're pushing your engine to the limits in professional competition, your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS 345192 kits are engineered specifically for forced induction and high-boost...09105946- SKU:
- 09105946
- Availability:
- Ships Same Business Day
- Weight:
- 2.91 LBS
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
- DISPLACEMENT:
- 998 CC
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 9.5:1
- PISTON HEAD SHAPE:
- DISHED
- RIDING STYLE:
- UTV
- WALL THICKNESS IMPERIAL:
- 0.160'
$839.99 -
JE PISTONS Piston Kit 208552
JE PISTONS
$309.99When you're pushing your engine to its absolute limit in professional competition, your pistons need to match that intensity. JE PISTONS' Pro Series 208552 kit delivers the precision engineering and structural reinforcement required for extreme...09105830- SKU:
- 09105830
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE SIZE METRIC:
- 89.00 MM
- DISPLACEMENT:
- 435 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS IMPERIAL:
- 0.180'
- WALL THICKNESS:
- 0,180'
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$309.99 -
JE PISTONS Piston Kit 128996
JE PISTONS
$269.99When you're pushing an engine to its absolute limit, stock pistons simply won't cut it. JE PISTONS' Pro Series 128996 kit is engineered specifically for professional competition and extreme applications, delivering the reliability and precision you need...09105832- SKU:
- 09105832
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE:
- +4,00 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 101.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.6:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- DISPLACEMENT:
- 640 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
$269.99 -
JE PISTONS Piston Kit 128998
JE PISTONS
$269.99If you're pushing your engine to the limit in competition or high-performance applications, your pistons need to match that commitment. JE PISTONS' Pro Series 128998 kit delivers the precision engineering and durability required for extreme racing...09105833- SKU:
- 09105833
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE:
- +5,00 MM
- BORE SIZE METRIC:
- 102.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 654 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- COMPRESSION RATIO IMPERIAL:
- 10.8:1
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +5.00 MM
- RIDING STYLE:
- OFF-ROAD
$269.99 -
JE PISTONS Piston Kit 130682
JE PISTONS
$269.99When you're pushing your engine to the absolute limit in professional competition, your pistons need to handle extreme loads without compromise. JE PISTONS 130682 kits deliver the precision engineering and material science required for forced induction...09105834- SKU:
- 09105834
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- ROUND FORGED DESIGN
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.25:1
- DISPLACEMENT:
- 644 CC
$269.99 -
JE PISTONS Piston Kit 131243
JE PISTONS
$269.99When you're pushing an engine to its absolute limit in competition, your pistons need to match that intensity. JE's Pro Series kit delivers the precision engineering and durability required for extreme applications where failure isn't an option. Built...09105836- SKU:
- 09105836
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON HEAD SHAPE:
- DOMED
- STYLE:
- JE PISTON
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- DISPLACEMENT:
- 277 CC
- BORE - OVERSIZE:
- +4,00 MM
- BORE SIZE METRIC:
- 77.00 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$269.99 -
JE PISTONS Piston Kit 133889
JE PISTONS
$269.99When you're pushing your engine to the limit in competition, your pistons need to withstand extreme pressures and temperatures without compromise. JE Pistons' Pro Series kit delivers the precision engineering and materials that separate winners from the...09105838- SKU:
- 09105838
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 87.00 MM
- DISPLACEMENT:
- 415 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- JE PISTON
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.8:1
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- ROUND FORGED DESIGN
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$269.99 -
JE PISTONS Piston Kit 177239
JE PISTONS
$269.99When you're pushing your engine to the limit in competition, every component needs to withstand extreme pressure and maintain precision under stress. JE Pistons' 177239 kit delivers the durability and performance you demand with forged 2618-T6 aluminum...09105840- SKU:
- 09105840
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- BORE - OVERSIZE:
- +3,00 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- JE PISTON
- UNITS:
- KIT
- DISPLACEMENT:
- 426 CC
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- ROUND FORGED DESIGN
- BORE - OVERSIZE METRIC:
- +3.00 MM
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$269.99 -
JE PISTONS Piston Kit 177240
JE PISTONS
$269.99When you're pushing your engine to the absolute limit in competition, your pistons need to survive extreme cylinder pressures and sustained high RPM without compromise. JE Pistons' Pro Series 177240 kit delivers the precision engineering and material...09105841- SKU:
- 09105841
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- DISPLACEMENT:
- 426 CC
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- BORE SIZE METRIC:
- 88.00 MM
- PRODUCT NAME:
- PISTON KIT
$269.99 -
JE PISTONS Piston Kit 180297
JE PISTONS
$269.99When you're pushing your engine to its absolute limits, your pistons need to withstand extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 180297 kit is engineered specifically for professional competition and high-boost...09105842- SKU:
- 09105842
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 398 CC
- RIDING STYLE:
- ATV
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE SIZE METRIC:
- 90.00 MM
- PISTON HEAD SHAPE:
- DISHED
- PRODUCT NAME:
- PISTON KIT
$269.99 -
JE PISTONS Piston Kit 183051
JE PISTONS
$269.99When you're pushing your engine to the absolute limit in competition, your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS' Pro Series kit delivers the precision engineering and durability required for...09105843- SKU:
- 09105843
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- BORE SIZE METRIC:
- 94.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +4.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- BORE - OVERSIZE:
- +4,00 MM
- DISPLACEMENT:
- 434 CC
- PISTON HEAD SHAPE:
- DISHED
- TYPE:
- ROUND FORGED DESIGN
$269.99 -
JE PISTONS Piston Kit 209283
JE PISTONS
$309.99When you're pushing your engine to its absolute limit in competition, your pistons need to survive extreme pressure, heat, and detonation without compromise. JE PISTONS Pro Series delivers the precision engineering and material science required for...09105844- SKU:
- 09105844
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- WALL THICKNESS:
- 0,150'
- BORE SIZE METRIC:
- 100.00 MM
- DISPLACEMENT:
- 651 CC
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- PISTON HEAD SHAPE:
- DOMED
- WALL THICKNESS IMPERIAL:
- 0.150'
$309.99 -
JE PISTONS Piston Kit 209292
JE PISTONS
$309.99When you're pushing your engine to the limit in competition, your pistons need to withstand extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 209292 kit delivers the precision engineering and durability required for...09105845- SKU:
- 09105845
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- WALL THICKNESS:
- 0,120'
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- WALL THICKNESS IMPERIAL:
- 0.120'
- DISPLACEMENT:
- 366 CC
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
$309.99 -
JE PISTONS Piston Kit 221767
JE PISTONS
$309.99When you're pushing your engine to its limits in competition or extreme performance applications, your pistons need to handle tremendous combustion pressures and thermal stress without compromise. JE PISTONS' Pro Series 221767 kit is engineered...09105846- SKU:
- 09105846
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- DISPLACEMENT:
- 449 CC
- BORE SIZE METRIC:
- 94.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- WALL THICKNESS:
- 0,150'
- WALL THICKNESS IMPERIAL:
- 0.150'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
$309.99
