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 76.96mm Kawasaki KX250F 2006-2009 8635DA
WOSSNER
$184.00Experience exceptional performance with the WOSSNER Piston Kit 8635DA, designed specifically for 2-stroke engines. Crafted from high-quality materials and engineered for precision, this piston kit enhances your engine's efficiency while ensuring...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
$184.00Elevate your engine's performance with the WOSSNER Piston Kit 8635DB, designed for high-demand applications. Crafted from premium materials and engineered with precision, this piston kit ensures optimal efficiency and durability, making it an essential...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
$184.00 -
Wossner Piston Kit 76.98mm Kawasaki KX250F 2006-2009 8635DC
WOSSNER
$184.00Experience unmatched performance with the WOSSNER Piston Kit 8635DC, expertly engineered for 2-stroke engines. Each kit includes a high-quality piston, rings, pin, and clips, designed to enhance durability and efficiency. With advanced technology and...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
$184.00 -
Wossner Piston Kit 75.97mm for KTM 250 SX-F 2006-2012 8645DB
WOSSNER
$204.00Elevate your engine's performance with the WOSSNER Piston Kit 8645DB, meticulously engineered for 2-stroke applications. Crafted from premium 4032 T6 forged aluminum alloy, this piston kit delivers exceptional durability and efficiency, ensuring a...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
$204.00 -
Wiseco Piston Kit 48mm Bore 2002-2023 Suzuki RM85 806M04800
WISECO
$119.95Engineered for peak performance, the Wiseco 806M04800 piston is crafted from a high-silicon aluminum alloy, ensuring exceptional strength and reliability for both racing and trail applications. This piston is designed to enhance durability and deliver...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
$119.95 -
Wiseco Piston Standard Yamaha YZ 85 2002-2021 805M04750
WISECO
$119.95Elevate your racing experience with the Wiseco Piston, engineered for maximum strength and performance. Crafted from high-silicon aluminum alloy, this piston enhances durability and boosts horsepower, ensuring your bike performs at its best on both...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
$119.95 -
Wiseco Piston Kit for Yamaha YZ 250 2002-2025 804M06640
WISECO
$154.95Elevate your racing experience with the Wiseco High-Performance Piston, engineered from a premium high-silicon aluminum alloy for unmatched strength and reliability. Designed for both trail and competitive racing, this piston maximizes horsepower and...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
$154.95 -
Wiseco Piston Kit 41.50mm KTM 50SX LC 2001-2008 803M04150
WISECO
$109.95Experience unparalleled performance with the Wiseco Piston, meticulously crafted from high-silicon aluminum for exceptional strength and reliability. Designed for both trail and racing applications, this piston guarantees increased horsepower and torque,...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
$104.95Experience unparalleled performance with the Wiseco Piston Standard 803M03950, crafted from a high-silicon aluminum alloy that guarantees exceptional strength and reliability. Designed for both trail and racing enthusiasts, this piston maximizes...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
$104.95 -
Wiseco Piston Standard Honda CR250R 1986-1996 801M06640
WISECO
$184.95Elevate your racing experience with the Wiseco High-Performance Piston, engineered for unmatched strength and reliability. Crafted from high-silicon aluminum alloy, this piston enhances durability and boosts horsepower, making it an ideal choice for both...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
$184.95 -
Wiseco Piston Standard Kawasaki KX 250 1992-2001 799M06640
WISECO
$184.95Unlock the full potential of your Kawasaki KX 250/250F with the Wiseco High-Performance Piston. Crafted from advanced high-silicon aluminum alloy, this piston ensures exceptional strength and reliability, making it perfect for both racing and trail...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
$144.95Experience unparalleled performance with the Wiseco 786M05400 piston, engineered from high-silicon aluminum alloy for superior strength and reliability. Designed for both competitive racing and trail applications, this piston enhances durability and...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
$144.95 -
Wiseco Piston Kit 56mm Bore Kawasaki KX125 1995-2008 783M05600
WISECO
$174.95Elevate your racing experience with the Wiseco piston designed specifically for the Kawasaki KX 125. Crafted from advanced high-silicon aluminum alloy, this piston ensures exceptional strength and reliability, delivering increased horsepower and torque...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
$174.95 -
WISECO Piston - Standard - Kawasaki KX 125 783M05400
WISECO
$144.95Forged from high-silicon aluminum alloy for maximum strength and dependability, Wiseco offers a complete range of popular piston models and years for both trail and racing applications, Durability, longevity and increased horsepower, Innovative forging...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
$119.95Elevate your racing experience with the Wiseco piston, engineered from high-silicon aluminum alloy for unmatched strength and reliability. Designed for both trail and competitive racing, this piston guarantees enhanced durability and increased...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
$119.95 -
Wiseco Piston Kit Yamaha WaveRunner GP1200 1997-1999 757M08500
WISECO
$159.95The WISECO Piston 757M08500 is engineered for optimal performance in 2-cycle engines, utilizing high-silicone forged construction to ensure superior strength and reduced thermal expansion. This piston comes complete with rings, wrist pins, and circlips,...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
$224.95Elevate your performance with the WISECO +2.10 mm piston, engineered from a high-silicon aluminum alloy for unmatched strength and reliability. Designed for both trail and racing enthusiasts, this piston delivers exceptional durability and increased...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
$224.95 -
Wiseco Piston Kit 66.4mm Standard Bore for 2000-2002 Suzuki RM250 756M06640
WISECO
$184.95Engineered for performance, the WISECO Piston 756M06640 is crafted from a high-silicon alloy, ensuring exceptional strength and reliability. This piston is designed to withstand the rigors of high-performance applications, making it the ideal choice for...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
$179.95Elevate your racing experience with the WISECO +2.00 mm piston, meticulously crafted from a high-silicon aluminum alloy. Designed for both trail and competitive environments, this piston ensures exceptional durability, enhanced horsepower, and a reliable...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
$179.95 -
Wiseco Piston Kit Standard 54mm for Suzuki RM125 2000-2003 755M05400
WISECO
$154.95Enhance your Suzuki RM 125's performance with the Wiseco Piston, engineered from high-silicon aluminum for exceptional strength and reliability. Designed for both trail and racing applications, this piston ensures durability and increased horsepower,...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
$154.95
