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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Wossner Piston Kit 76.96mm Kawasaki KX250F 2006-2009 8635DA
WOSSNER
$184.00If you're running a KX250F between 2006-2009, piston wear directly impacts throttle response, compression, and ring seal integrity—all critical factors in maintaining competitive lap times or reliable trail performance. The Wossner 8635DA delivers...09104953- SKU:
- 09104953
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 76.97mm Kawasaki KX250F 2006-2009 8635DB
WOSSNER
$184.00When you're pushing a KX250F to its limits, your factory piston won't cut it. This Wossner kit replaces worn or damaged pistons with a precision-engineered assembly that handles sustained high RPM loads and heat stress without compromise. Complete with...09104954- SKU:
- 09104954
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE SIZE METRIC:
- 77.01 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.97 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 76.98mm Kawasaki KX250F 2006-2009 8635DC
WOSSNER
$184.00When you're pushing a KX250F to its limits, your piston kit needs to survive extreme combustion pressures and thermal cycling without compromise. The Wossner 8635DC delivers German precision engineering with a forged aluminum construction that handles...09104955- SKU:
- 09104955
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 77.02 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.98 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit 75.97mm for KTM 250 SX-F 2006-2012 8645DB
WOSSNER
$204.00The Wossner 8645DB piston kit is engineered for KTM 250 SX-F riders who demand reliability and responsive power delivery over an entire racing season. Constructed from 4032 T6 forged aluminum, this kit withstands the thermal cycling and combustion...09104957- SKU:
- 09104957
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 76.01 MM
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 75.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,01 MM
- PRODUCT NAME:
- PISTON KIT
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wiseco Piston Kit 48mm Bore 2002-2023 Suzuki RM85 806M04800
WISECO
$132.95The Wiseco 806M04800 piston kit delivers the durability and power output you need to stay competitive in the RM85 class, whether you're chasing podiums or pushing limits on the trail. Built from forged high-silicon aluminum, this piston withstands the...806M04800- SKU:
- 806M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84.7 CC
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
$132.95 -
Wiseco Piston Standard Yamaha YZ 85 2002-2021 805M04750
WISECO
$132.95The stock piston in your YZ 85 can't keep up with the demands of competitive racing or aggressive trail riding. Wiseco's forged piston delivers the compression consistency, durability, and power output you need to stay competitive across multiple seasons...805M04750- SKU:
- 805M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 47,80 MM
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 85 CC
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$132.95 -
Wiseco Piston Kit for Yamaha YZ 250 2002-2025 804M06640
WISECO
$171.95If you're running a Yamaha YZ 250 in competitive racing or high-performance trail riding, stock pistons won't cut it. The Wiseco 804M06640 kit delivers the strength and precision needed to handle aggressive tuning, boost horsepower, and maintain...804M06640- SKU:
- 804M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$171.95 -
Wiseco Piston Kit 41.50mm KTM 50SX LC 2001-2008 803M04150
WISECO
$109.95The Wiseco Piston Kit delivers the durability and performance gains your KTM 50SX LC demands during high-RPM racing and aggressive trail riding. High-silicon aluminum construction and E-coat protection resist thermal stress and wear, while the optimized...803M04150- SKU:
- 803M04150
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 49 CC
- STROKE LENGTH:
- 40,00 MM
- BORE SIZE METRIC:
- 41.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 40.00 MM
- UNITS:
- EACH
$109.95 -
Wiseco 39.50mm Piston Kit for KTM 50 SX 2001-2008 803M03950
WISECO
$116.95The Wiseco 39.50mm piston kit delivers the compression ratio stability and durability your KTM 50 SX demands during sustained racing or aggressive trail riding. Built from high-silicon aluminum alloy and featuring E-coated critical surfaces, this forged...803M03950- SKU:
- 803M03950
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 40,00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 39.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- DISPLACEMENT:
- 49 CC
$116.95 -
Wiseco Piston Standard Honda CR250R 1986-1996 801M06640
WISECO
$184.95The stock piston in your CR250R won't cut it if you're pushing for consistent power and reliability on the track or trail. Wiseco's forged piston delivers the durability and compression needed to handle aggressive tuning while maintaining the tight...801M06640- SKU:
- 801M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Standard Kawasaki KX 250 1992-2001 799M06640
WISECO
$184.95When you're pushing your KX 250 to the limit, your piston is doing the same. The Wiseco Standard Piston delivers the strength and precision needed to handle sustained high-RPM racing and aggressive trail riding without sacrificing reliability. Built with...799M06640- SKU:
- 799M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249,3 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$184.95 -
Wiseco 125cc 54mm Piston Kit for KTM 125 SX 2001-2024 786M05400
WISECO
$160.95The Wiseco 786M05400 piston kit delivers the durability and precision you need to extract maximum performance from your KTM 125 SX. Built from high-silicon aluminum and E-coated for wear resistance, this complete kit keeps your engine reliable through...786M05400- SKU:
- 786M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- STROKE LENGTH:
- 54,50 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit 56mm Bore Kawasaki KX125 1995-2008 783M05600
WISECO
$177.95When you're pushing a KX125 to its limits on the track, piston durability and compression integrity directly determine whether you gain an advantage or lose time to mechanical failure. The Wiseco 56mm piston kit delivers the forged strength and precision...783M05600- SKU:
- 783M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 129 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
$177.95 -
WISECO Piston - Standard - Kawasaki KX 125 783M05400
WISECO
$144.95The Wiseco 783M05400 piston delivers the reliability and sustained power output you need to stay competitive on the track or trail. Built from high-silicon forged aluminum with a structurally advanced design, this piston resists wear and detonation...783M05400- SKU:
- 783M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$144.95 -
Wiseco Piston Kit Kawasaki KX 85 2001-2013 782M04850
WISECO
$132.95If you're running a KX 85 in competitive or trail racing, piston durability and horsepower output directly impact your results. Wiseco's forged high-silicon aluminum construction withstands the extreme pressures of two-stroke racing while the optimized...782M04850- SKU:
- 782M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 48.50 MM
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$132.95 -
Wiseco Piston Kit Yamaha WaveRunner GP1200 1997-1999 757M08500
WISECO
$159.95When your WaveRunner GP1200 demands peak performance, a compromised piston setup costs you power, reliability, and race-day confidence. The Wiseco 757M08500 piston kit delivers the durability and precision fit your 2-cycle engine needs to perform...757M08500- SKU:
- 757M08500
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 1156 CC
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 771 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$159.95 -
Wiseco Piston Kit 68.50mm for Suzuki RM 250 2000-2002 756M06850
WISECO
$224.95The Wiseco Piston Kit 68.50mm (+2.10mm oversized) is engineered for riders who demand more from their RM 250. This high-silicon aluminum forging delivers measurable gains in compression, top-end power, and durability—essential upgrades when you're...756M06850- SKU:
- 756M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE METRIC:
- +2.10 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,10 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 66.4mm Standard Bore for 2000-2002 Suzuki RM250 756M06640
WISECO
$184.95The Wiseco 756M06640 piston kit delivers the strength and thermal stability your RM250 needs to handle sustained high-RPM riding without compromise. Built from high-silicon alloy, this piston resists detonation and wear while maintaining precise...756M06640- SKU:
- 756M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$184.95 -
Wiseco Piston Kit 2.00 mm Oversize for Kawasaki KX 125 1995-2008 755M05600
WISECO
$182.95If you're running a KX 125 in competitive environments or demanding trail conditions, a +2.00 mm overbore piston is essential for restoring lost displacement and extracting maximum power from your engine. Wiseco's forged design delivers the strength and...755M05600- SKU:
- 755M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 134 CC
- STROKE LENGTH:
- 54,50 MM
$182.95 -
Wiseco Piston Kit Standard 54mm for Suzuki RM125 2000-2003 755M05400
WISECO
$166.95When you're pushing your RM125 to its limits on the track or trail, your original piston won't cut it—you need a forged replacement engineered for the demands of serious riding. The Wiseco Piston Kit delivers measurable horsepower gains and extended...755M05400- SKU:
- 755M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$166.95Qty in Cart: 0Quantity:Price:$166.95Subtotal:
