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
-
Wiseco Piston Kit with Gaskets for 1997-2001 Honda CR250R PK1168
WISECO
$254.95Upgrade your engine's performance with the WISECO Piston Kit, designed specifically for 2-cycle engines. This complete kit features high-performance forged pistons made from high-silicone bar stock, ensuring greater strength and reduced thermal expansion...09030311- SKU:
- 09030311
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$254.95 -
Wiseco YZ250 2002-2022 Piston Kit with Gaskets PK1704
WISECO
$274.95Elevate your engine performance with the WISECO Piston Kit, crafted from high-silicon aluminum alloy for unparalleled strength and reliability. This comprehensive kit includes everything you need for overboring or rebuilding your top end, ensuring...09030929- SKU:
- 09030929
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- COOLING SYSTEM:
- LIQUID COOLED
- DISPLACEMENT:
- 249,3 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$274.95 -
Wiseco KX85 2001-2013 Piston Kit with Gaskets PK1762
WISECO
$179.95Upgrade your engine's performance with the WISECO Piston Kit, designed specifically for 2-cycle applications. Crafted from high-silicone forged materials, this kit ensures exceptional strength and minimal thermal expansion at elevated temperatures,...09030930- SKU:
- 09030930
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 84.9 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- GP SERIES
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
$179.95 -
Wiseco Piston Kit Standard 54mm Honda CR125R 1992-2003 676M05400
WISECO
$129.95Elevate your performance with the WISECO Piston, expertly crafted from high-silicon aluminum alloy for exceptional strength and reliability. Designed for both competitive racing and trail riding, this piston enhances durability and maximizes horsepower,...676M05400- SKU:
- 676M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$129.95 -
Wiseco Piston Kit 54.50 mm Honda CR125R 1992-2003 676M05450
WISECO
$154.95Experience unmatched performance with the Wiseco forged piston, designed specifically for the Honda CR125R. Crafted from high-silicon aluminum alloy, this piston delivers exceptional durability and power, making it ideal for both racing and trail riding...676M05450- SKU:
- 676M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95 -
Wiseco Piston Kit 52.00 mm Oversize Suzuki RM 85 2002-2022 806M05200
WISECO
$169.95Experience unparalleled performance and reliability with the Wiseco +5.00 mm piston, designed specifically for the Suzuki RM 85/L. Crafted from high-silicon aluminum alloy, this piston ensures maximum strength and longevity, making it ideal for both...806M05200- SKU:
- 806M05200
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 99.4 CC
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
$169.95 -
Wiseco Piston Kit 56.00mm 2.00mm Oversize for KTM 125 SX 2001-2021 786M05600
WISECO
$174.95Experience unparalleled performance with the Wiseco Piston, expertly crafted from a high-silicon aluminum alloy for exceptional strength and reliability. Designed for both trail and racing applications, this piston enhances durability and horsepower,...786M05600- SKU:
- 786M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STROKE LENGTH:
- 54,50 MM
$174.95 -
Wiseco Piston Kit 54mm Bore Kawasaki KX125 2001-2008 788M05400
WISECO
$184.95Elevate your racing experience with the Wiseco Piston, expertly crafted from high-silicon aluminum alloy for unmatched strength and reliability. Designed for both competitive and recreational use, this piston maximizes horsepower and torque while...788M05400- SKU:
- 788M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$184.95 -
Wiseco Piston Kit 81mm Yamaha WaveRunner 1994-1997 790M08100
WISECO
$159.95The WISECO Piston 790M08100 is engineered for superior performance in 2-cycle engines, crafted from high-silicone forged bar stock to ensure exceptional strength and minimal thermal expansion. Designed specifically for high-performance applications, this...790M08100- SKU:
- 790M08100
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 81.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 701 CC
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$159.95 -
Wiseco 80.50mm Piston Kit for Kawasaki 1100 ZXi 1996-2003 809M08050
WISECO
$149.95Experience unmatched performance with the WISECO Piston 809M08050, designed specifically for high-demand 2-cycle applications. Crafted from premium high-silicone forged bar stock, this piston ensures superior strength and minimal thermal expansion,...809M08050- SKU:
- 809M08050
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 1083 CC
- DISPLACEMENT:
- 752 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 80.50 MM
- UNITS:
- EACH
$149.95 -
Wiseco Piston Kit 95mm 11.8:1 Compression KTM 450 XC-F 2012-2016 PK1901
WISECO
$329.95Upgrade your KTM engine with the WISECO Piston Kit, designed for optimal performance and durability. This comprehensive kit includes everything you need for a complete top-end rebuild, ensuring your engine runs smoothly and efficiently. With...09031145- SKU:
- 09031145
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 63.40 MM
- TYPE:
- TOP END
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$329.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2023 PK1904
WISECO
$169.95Experience unparalleled performance with the WISECO Piston Kit, specifically designed for Kawasaki engines. This complete kit features high-performance forged pistons that deliver exceptional strength and reduced thermal expansion, ensuring optimal...09031148- SKU:
- 09031148
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 84.9 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 48.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$169.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905
WISECO
$169.95Upgrade your Kawasaki engine with the WISECO Piston Kit, designed for optimal performance and durability. This complete kit includes everything you need for a successful top-end rebuild, ensuring your engine runs smoothly and efficiently. ...09031149- SKU:
- 09031149
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 48.95 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84.9 CC
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$169.95 -
Wiseco Suzuki RM125 2004-2008 GP Series Piston Kit PK1412
WISECO
$284.95Engineered for performance and durability, the WISECO Piston Kit with Gaskets PK1412 is perfect for those looking to enhance their engine's capabilities. Crafted from a high-silicon aluminum alloy, this kit ensures maximum strength and reliability during...09030687- SKU:
- 09030687
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +4,00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 58.00 MM
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +4.00 MM
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 125 CC
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco Piston Kit Kawasaki KX85 2001-2008 782M04900
WISECO
$119.95Upgrade your KX85's performance with the WISECO Piston Kit, designed for models from 2001 to 2008. This high-quality piston kit enhances engine efficiency and power output, ensuring a smoother ride and improved throttle response. Please note that this...09101237- SKU:
- 09101237
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 49.00 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$119.95 -
Wiseco Piston Kit with Gaskets 56mm Kawasaki KX125 2001-2002 PK1503
WISECO
$239.95Enhance your engine's performance with the WISECO Piston Kit, specifically designed for 2-cycle engines. Crafted from high-silicone forged material, this kit ensures superior strength and minimal thermal expansion, making it ideal for high-performance...09030698- SKU:
- 09030698
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$239.95 -
Wiseco Piston Kit Kawasaki KX125 2003-2008 GP 788M05800
WISECO
$199.95Upgrade your KX125 with the WISECO Piston Kit, designed for enhanced performance and reliability. This high-quality piston kit ensures optimal engine efficiency, delivering the power you need for an exhilarating ride. Please note that this kit does not...09101239- SKU:
- 09101239
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +4,00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$199.95 -
Wiseco Piston Kit Yamaha YZ125 2002-2004 797M05450
WISECO
$144.95Enhance your YZ125's performance with the WISECO Piston Kit, designed specifically for models from 2002 to 2004. Built for durability and precision, this piston kit ensures optimal engine efficiency and power. Please note that this kit does not include a...09101240- SKU:
- 09101240
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$144.95 -
Wiseco 47mm Piston Kit with Gaskets for 1993-2001 Yamaha YZ80 PK1553
WISECO
$179.95Elevate your engine's performance with the WISECO Piston Kit, designed specifically for 2-cycle engines. Crafted from high-silicone forged bar stock, this kit ensures superior strength and reduced thermal expansion, making it ideal for high-temperature...09030711- SKU:
- 09030711
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 46.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$179.95 -
Wiseco Piston Kit with Gaskets Yamaha YZ250 1995-1998 PK1569
WISECO
$264.95Elevate your engine's performance with the WISECO Piston Kit. Crafted from high-silicone bar stock, these forged pistons offer superior strength and reduced thermal expansion, ensuring optimal operation at high temperatures. This complete kit includes...09030722- SKU:
- 09030722
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 246.8 CC
- PISTON DIAMETER METRIC:
- 68.96 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +1,00 MM
$264.95
