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
$143.95A worn or stock piston limits your KX80's potential—restricting throttle response, reducing engine durability, and leaving power on the table. The Wiseco 644M04800 restores efficiency and longevity through precision engineering and premium materials,...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
$143.95 -
Wiseco Piston Kit 70.75mm Polaris SL 750 1993-1995 633M07075
WISECO
$154.23If you're running a 2-stroke Polaris SL 750 and demanding more from your engine, a precision piston kit is the foundation for reliable power gains. Wiseco's forged-aluminum construction handles the extreme pressures of high-RPM operation, while the 70...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
$154.23Qty in Cart: 0Quantity:Price:$154.23Subtotal: -
Wiseco Piston Kit 55.00 mm Kawasaki KX125 1993 626M05500
WISECO
$154.95If you're running a 1993 Kawasaki KX125, a worn piston directly kills your power delivery and throttle response. The Wiseco 626M05500 restores the compression and precision your engine needs to perform at peak efficiency, whether you're chasing lap times...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
$154.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity—especially in high-RPM 2-stroke applications where precision tolerances are critical. The Wiseco 626M05400 restores your KX125 to factory...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
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 67.50 mm for Kawasaki KX 250 1996-2001 617M06750
WISECO
$221.95A worn or damaged piston directly kills your KX250's throttle response and compression, forcing you to either rebuild or replace the entire top-end. The Wiseco 617M06750 restores full power and reliability with a forged piston kit engineered specifically...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
$221.95 -
Wiseco Piston Kit Kawasaki KX 250 1992-2001 67.00 mm 617M06700
WISECO
$221.95A worn or damaged piston directly compromises engine compression, throttle response, and reliability—especially critical in 2-stroke racing engines where precision tolerances determine the difference between winning and mechanical failure. The Wiseco...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
$221.95 -
Wiseco Piston Kit 68.50mm for 1997-2001 Honda CR250R 702M06850
WISECO
$224.95If you're rebuilding a 1997-2001 Honda CR250R, piston quality directly impacts throttle response, combustion efficiency, and engine longevity. Wiseco's precision-forged construction delivers the reliability and performance demanded by serious 2-stroke...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
$199.95When your CR250R's piston shows signs of wear or you're building up displacement with a 1.00mm oversize, a quality replacement is non-negotiable. Wiseco's aerospace-grade aluminum construction withstands the extreme combustion pressures of 2-stroke...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
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 0.50mm Oversize Honda CR250R 1986-1996 614M06700
WISECO
$199.95If you're running a 1986-1996 Honda CR250R, a worn or damaged piston directly kills power delivery and compression. The Wiseco 614M06700 restores—and exceeds—original performance with a high-silicon aluminum construction built to handle the extreme heat...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
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit Standard 66.40mm Honda CR250R 1986-1996 614M06640
WISECO
$221.95If you're running a CR250R from the golden era of 2-stroke racing, piston wear is inevitable—and a worn piston tanks power, efficiency, and reliability. The Wiseco 614M06640 is a direct replacement built to OEM specifications with high-silicon forged...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
$221.95 -
Wiseco Piston Kit +2.00 mm Yamaha YZ 250 1988-1991 605M07000
WISECO
$224.95If you're running a vintage Yamaha YZ250 or WR250 two-stroke, piston wear directly impacts power delivery, throttle response, and engine longevity. The Wiseco 605M07000 is a purpose-built replacement that restores lost compression and responsiveness...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
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit for Yamaha YZ250 1999-2001 +1.50 mm 605M06950
WISECO
$224.95If you're running a YZ250 and want to unlock measurable gains in power delivery and engine longevity, a quality piston kit is essential. Wiseco's forged-aluminum construction delivers the precision and durability demanded by serious 2-stroke riders. This...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
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Yamaha YZ250 1999-2024 66.40mm 804M06640
WISECO
$219.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine reliability—especially in high-demand 2-stroke applications. The Wiseco Piston Kit 605M06900 restores your YZ250's performance with forged aluminum...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
$219.95 -
Wiseco Piston 68.50mm Yamaha YZ250 1988-1998 605M06850
WISECO
$219.95If you're running a Yamaha YZ250 two-stroke, piston wear directly impacts throttle response, compression, and reliability. The Wiseco 605M06850 is a forged-aluminum piston kit engineered to restore—or exceed—OEM performance with the supporting components...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
$219.95 -
Wiseco Piston Kit 54.00 mm Honda CR125R 2004 564M05400
WISECO
$154.95When a 2-stroke piston fails or shows signs of wear, your bike's performance and reliability suffer immediately. The Wiseco Piston Kit 595M05500 replaces worn components with forged aluminum construction and precision engineering, restoring combustion...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
$144.95If you're rebuilding a YZ80 or pushing your 2-stroke to the limit, a worn piston directly kills your power and efficiency. The Wiseco Piston Kit 569M05000 restores—or exceeds—OEM performance with precision-engineered components that handle high RPMs 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
$134.95A worn or damaged piston directly compromises your YZ80's compression, throttle response, and overall engine reliability. The Wiseco 569M04900 restores lost performance and durability with forged high-silicon aluminum engineered to handle the demands of...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
$199.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity—especially in a high-revving 2-stroke like the YZ250. The Wiseco 560M06800 restores lost performance with precision-engineered geometry and...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
$154.95If you're running a Yamaha YZ125 two-stroke, piston wear is inevitable—and it directly impacts throttle response, compression, and overall power delivery. The Wiseco 559M05700 restores your engine to peak performance with precision-forged construction...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
$199.95If you're running a KX 250 two-stroke, piston wear directly impacts combustion efficiency, throttle response, and overall engine reliability. The Wiseco 556M06850 piston kit restores lost performance through precision engineering and premium materials,...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
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal:
