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 Standard Kawasaki KX 80 1988-2000 644M04800
WISECO
$134.95Wiseco Piston Kit - Part #644M04800 Elevate your Kawasaki KX80's performance with the Wiseco Piston Kit, part number 644M04800. Designed for the serious rider, this kit enhances engine efficiency and responsiveness, ensuring you get the most out of every...644M04800- SKU:
- 644M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 45,80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.80 MM
$134.95 -
Wiseco Piston Kit 70.75mm Polaris SL 750 1993-1995 633M07075
WISECO
$159.95Wiseco Piston Kit - Part #633M07075 Elevate your engine's performance with the Wiseco Piston Kit, part number 633M07075. Designed specifically for 2-stroke engines, this piston kit combines advanced engineering with high-quality materials to deliver...633M07075- SKU:
- 633M07075
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 70.75 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 766 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$159.95 -
Wiseco Piston Kit 55.00 mm Kawasaki KX125 1993 626M05500
WISECO
$154.95Wiseco Piston Kit - Part #626M05500 Elevate your riding experience with the Wiseco Piston Kit, part number 626M05500. Designed specifically for 2-stroke engines, this premium kit enhances your bike's performance through advanced engineering and top-tier...626M05500- SKU:
- 626M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH:
- 54,50 MM
$154.95 -
WISECO Piston - Standard - Kawasaki KX 125 626M05400
WISECO
$154.95Wiseco Piston Kit - Part #626M05400 Unlock a new level of performance with the Wiseco Piston Kit, part number 626M05400. Designed specifically for 2-stroke engines, this top-tier piston kit delivers the perfect balance of durability, efficiency, and...626M05400- SKU:
- 626M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
$154.95 -
Wiseco Piston Kit 67.50 mm for Kawasaki KX 250 1996-2001 617M06750
WISECO
$199.95Wiseco Piston Kit - Part #617M06750 Elevate your riding experience with the Wiseco Piston Kit, part number 617M06750. Specifically designed for 2-stroke engines, this high-performance kit promises exceptional durability, increased power, and reliable...617M06750- SKU:
- 617M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,10 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$199.95 -
Wiseco Piston Kit Kawasaki KX 250 1992-2001 67.00 mm 617M06700
WISECO
$199.95Wiseco Piston Kit - Part #617M06700 Transform your riding experience with the Wiseco Piston Kit, part number 617M06700. Engineered for high-performance 2-stroke engines, this kit combines cutting-edge technology with superior materials to ensure...617M06700- SKU:
- 617M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- BORE - OVERSIZE METRIC:
- +0.60 MM
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 249 CC
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,60 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$199.95 -
Wiseco Piston Kit 68.50mm for 1997-2001 Honda CR250R 702M06850
WISECO
$224.95Wiseco Piston Kit - Part #614M06850 Elevate your motorcycle's performance with the Wiseco Piston Kit, part number 614M06850. Specifically crafted for 2-stroke engines, this kit combines innovative engineering and high-quality materials to enhance your...614M06850- SKU:
- 614M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +2,10 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 68.25 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 72,00 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$224.95 -
Wiseco Piston 1.00mm Oversize Honda CR250R 2001 614M06750
WISECO
$199.95Wiseco Piston Kit - Part #614M06750 Transform your riding experience with the Wiseco Piston Kit, part number 614M06750. Specifically crafted for 2-stroke engine aficionados, this premium piston kit promises exceptional durability and enhanced...614M06750- SKU:
- 614M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- STROKE LENGTH:
- 72,00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$199.95 -
Wiseco Piston Kit 0.50mm Oversize Honda CR250R 1986-1996 614M06700
WISECO
$199.95Wiseco Performance Piston Kit - Part #614M06700 Elevate your riding experience with the Wiseco Performance Piston Kit, designed specifically for 2-stroke engines. This kit not only enhances your bike's power output but also ensures reliability and...614M06700- SKU:
- 614M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 67.00 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 72,00 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$199.95 -
Wiseco Piston Kit Standard 66.40mm Honda CR250R 1986-1996 614M06640
WISECO
$199.95Wiseco Piston Kit - Part #614M06640 Elevate your riding experience with the Wiseco Piston Kit, part number 614M06640. This premium piston kit is specifically engineered for 2-stroke engines, ensuring peak performance and reliability for those who demand...614M06640- SKU:
- 614M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
$199.95 -
Wiseco Piston Kit +2.00 mm Yamaha YZ 250 1988-1991 605M07000
WISECO
$224.95Wiseco Piston Kit - Part #605M07000 Elevate your 2-stroke engine's performance with the Wiseco Piston Kit, part number 605M07000. Crafted for enthusiasts who prioritize strength and efficiency, this kit enhances your bike's responsiveness and overall...605M07000- SKU:
- 605M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 246,8 CC
- STROKE LENGTH METRIC:
- 68.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 70.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
$224.95 -
Wiseco Piston Kit for Yamaha YZ250 1999-2001 +1.50 mm 605M06950
WISECO
$224.95Wiseco Piston Kit - Part #605M06950 Elevate your bike's performance with the Wiseco Piston Kit, part number 605M06950. Designed specifically for 2-stroke engines, this kit offers exceptional strength and reliability, ensuring you get the most out of...605M06950- SKU:
- 605M06950
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 68,00 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 69.50 MM
- DISPLACEMENT:
- 246,8 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 68.00 MM
$224.95 -
Wiseco Piston Kit Yamaha YZ250 1999-2024 66.40mm 804M06640
WISECO
$199.95Wiseco Piston Kit - Part #605M06900 Transform your riding experience with the Wiseco Piston Kit, part number 605M06900. Engineered for 2-stroke engines, this premium kit combines innovative design with high-performance materials, ensuring your bike...605M06900- SKU:
- 605M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 246,8 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 68,00 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
$199.95 -
Wiseco Piston 68.50mm Yamaha YZ250 1988-1998 605M06850
WISECO
$199.95Wiseco Piston Kit - Part #605M06850 Elevate your riding experience with the Wiseco Piston Kit, part number 605M06850. Engineered for performance, this piston kit enhances the power and reliability of your 2-stroke engine, making it perfect for both...605M06850- SKU:
- 605M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 68.50 MM
- STROKE LENGTH:
- 68,00 MM
- DISPLACEMENT:
- 246,8 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
$199.95 -
Wiseco Piston Kit 54.00 mm Honda CR125R 2004 564M05400
WISECO
$154.95Wiseco Piston Kit - Part #595M05500 Elevate your bike's performance with the Wiseco Piston Kit, part number 595M05500. Designed specifically for 2-stroke engines, this kit combines innovation and premium materials to enhance durability, power, and...595M05500- SKU:
- 595M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- DISPLACEMENT:
- 125 CC
- UNITS:
- EACH
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH:
- 54,50 MM
$154.95 -
Wiseco Piston Kit 51.00mm Yamaha YZ80 1976-1980 457M05100
WISECO
$144.95Wiseco Piston Kit - Part #569M05000 Elevate your motorcycle's performance with the Wiseco Piston Kit, part number 569M05000. Specifically engineered for 2-stroke engines, this kit combines innovative design with superior materials to enhance power and...569M05000- SKU:
- 569M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE METRIC:
- 50.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 45,60 MM
- STROKE LENGTH METRIC:
- 45.60 MM
$144.95 -
WISECO Piston - +1.00 mm - Yamaha YZ 80 569M04900
WISECO
$134.95Wiseco Piston Kit - Part #569M04900 Unlock your bike's potential with the Wiseco Piston Kit, part number 569M04900. This premium piston kit combines advanced engineering with high-performance materials to deliver superior strength, durability, and...569M04900- SKU:
- 569M04900
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 49.00 MM
- STROKE LENGTH:
- 45,60 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH METRIC:
- 45.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Standard Yamaha YZ 250 1999-2022 560M06800
WISECO
$199.95Wiseco Piston Kit - Part #560M06800 Elevate your motorcycle's performance with the Wiseco Piston Kit, part number 560M06800. Designed specifically for high-performance 2-stroke engines, this kit guarantees durability and power, ensuring you get the most...560M06800- SKU:
- 560M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246,8 CC
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 68,00 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.00 MM
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 57.00 mm for Yamaha YZ 125 1986-1988 559M05700
WISECO
$154.95Unlock your bike's full potential with the Wiseco Piston Kit, part number 559M05700. Specifically designed for 2-stroke engines, this piston kit enhances performance, ensuring reliability and power for the most demanding riders. Precision Forged...559M05700- SKU:
- 559M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 50,00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 57.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
$154.95 -
Wiseco Piston Kit Kawasaki KX 250 1990 1991 68.50 mm 556M06850
WISECO
$199.95Wiseco Piston Kit - Part #556M06850 Elevate your riding experience with the Wiseco Piston Kit, part number 556M06850. Crafted for dedicated 2-stroke enthusiasts, this piston kit combines precision engineering with high-quality materials to deliver...556M06850- SKU:
- 556M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +1,10 MM
- BORE SIZE METRIC:
- 68.50 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.10 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 70,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 70.00 MM
$199.95
