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 79mm Bore 1998-2002 KTM 380 SX 748M07900
WISECO
$243.95Stock pistons in your KTM 380 SX reach their limits under aggressive riding and high-RPM demands. The Wiseco 79mm piston kit delivers the strength and precision your engine needs to maintain reliability while unlocking additional power—critical for...748M07900- SKU:
- 748M07900
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 368 CC
- STROKE LENGTH METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 77,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.00 MM
- PISTON MATERIAL:
- FORGED
$243.95 -
Wiseco Piston Standard Yamaha YZ 125 1998-2001 726M05400
WISECO
$154.95When you're pushing your YZ 125 to the limit, your piston is doing the hardest work in the engine—and a worn or damaged one will cost you power, reliability, and race results. The Wiseco 726M05400 is engineered to restore peak combustion efficiency while...726M05400- SKU:
- 726M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$154.95 -
Wiseco Piston +0.50 mm Yamaha YZ 125 2000-2025 726M05450
WISECO
$154.95If you're running a YZ125 at the limit, piston wear and clearance issues will kill your power delivery and throttle response. The Wiseco +0.50mm piston restores compression and combustion efficiency to factory specifications—or better—with precision CNC...726M05450- SKU:
- 726M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH:
- 54,50 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$154.95 -
Wiseco Piston Kit 54mm for Suzuki RM125 1989-1999 641M05400
WISECO
$162.95If you're rebuilding a RM125 or chasing more responsive power delivery, a quality piston kit is non-negotiable. Wiseco's 54mm design delivers the precision fit and lightweight construction that separates a stock rebuild from a genuinely competitive...641M05400- SKU:
- 641M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$162.95Qty in Cart: 0Quantity:Price:$162.95Subtotal: -
Wiseco Piston Kit 54.50 mm Suzuki RM125 1989-1999 641M05450
WISECO
$162.95If you're running a Suzuki RM125 from the '89–'99 generation, a worn or stock piston is costing you power and throttle response. The Wiseco Piston Kit delivers the precision engineering and material science needed to unlock real horsepower gains while...641M05450- SKU:
- 641M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 54,00 MM
$162.95Qty in Cart: 0Quantity:Price:$162.95Subtotal: -
Wiseco Piston +1.00 mm Suzuki RM 125 1989-1999 641M05500
WISECO
$154.95If you're running a Suzuki RM125 and want to unlock real gains in power and throttle response, a properly sized piston is where it starts. Wiseco's +1.00mm oversized piston delivers the durability and precision you need to push your engine hard without...641M05500- SKU:
- 641M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
$154.95 -
Wiseco Piston Kit 67.00 mm Suzuki RM250 1989-1995 642M06700
WISECO
$199.95A worn or damaged piston directly limits your RM250's ability to build compression and sustain peak RPM, translating to sluggish throttle response and lost power on the track. Wiseco's 67mm piston kit restores—or exceeds—OEM performance through precise...642M06700- SKU:
- 642M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
- STROKE LENGTH METRIC:
- 70.80 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 70,8 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 246 CC
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 66.4mm for Suzuki RM250 1996-1997 681M06640
WISECO
$199.95Keep your 2-stroke running at peak performance with a piston engineered to handle the demands of competitive riding and high-RPM abuse. Wiseco's precision CNC-machined design ensures reliable power delivery and throttle response without compromise...642M06750- SKU:
- 642M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 70,8 MM
- STROKE LENGTH METRIC:
- 70.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- +0.50 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 47mm Honda CR80R 1986-2002 643M04700
WISECO
$143.95A worn or stock piston limits your CR80R's potential—whether you're chasing lap times or simply want responsive, reliable power. The Wiseco 643M04700 delivers the strength and precision needed to unlock your bike's performance while maintaining the...643M04700- SKU:
- 643M04700
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- DISPLACEMENT:
- 82,9 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
$143.95 -
Wiseco Piston Kit 0.50mm Oversize 1986-2002 Honda CR80R 643M04750
WISECO
$143.95When you're pushing a CR80R to its limits, factory pistons become your bottleneck. The Wiseco 643M04750 delivers the strength and thermal stability you need to extract real power gains without sacrificing reliability—whether you're racing competitively...643M04750- SKU:
- 643M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 47,80 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 82,9 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- PISTON MATERIAL:
- FORGED
$143.95 -
Wiseco Piston Kit 48.00mm for Honda CR80R 1986-2002 643M04800
WISECO
$134.95The stock piston in your CR80R won't cut it if you're serious about consistent power and engine longevity. This Wiseco piston kit replaces worn or damaged pistons with a precision-engineered component that delivers reliable performance lap after lap,...643M04800- SKU:
- 643M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 82,9 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 47,80 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm Bore Kawasaki KX125 1994 640M05400
WISECO
$154.95The Wiseco Piston Kit delivers the precision and durability required for consistent power delivery in your Kawasaki KX125. Whether you're pushing hard on the track or navigating technical terrain, a quality piston directly impacts throttle response,...640M05400- SKU:
- 640M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH:
- 54,50 MM
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Sea-Doo GTX 1994-1995 663M07800
WISECO
$154.23Stock pistons in your 1994-1995 Sea-Doo GTX can't handle sustained high-RPM operation without accelerated wear. The Wiseco 663M07800 delivers the durability and precision fit you need to maximize engine efficiency and throttle response without compromise...663M07800- SKU:
- 663M07800
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 650 CC
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 78.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$154.23 -
Wiseco Piston 78.50mm Sea-Doo GTX 1994-1995 663M07850
WISECO
$154.23When you're rebuilding a 650cc Sea-Doo engine, piston quality directly impacts reliability and peak performance. The Wiseco 663M07850 delivers the precision fit and thermal stability required for consistent power delivery, whether you're running stock...663M07850- SKU:
- 663M07850
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 658 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 78.50 MM
- PRODUCT NAME:
- PISTON
$154.23 -
Wiseco Piston 79.00mm 1993-1996 Sea-Doo Explorer GTX SPX XP 663M07900
WISECO
$154.23If you're running a 1993-1996 Sea-Doo Explorer, GTX, SPX, or XP, a worn or damaged piston directly impacts combustion efficiency, throttle response, and engine longevity. The Wiseco 663M07900 is a direct replacement engineered to restore—or exceed—your...663M07900- SKU:
- 663M07900
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- WATERCRAFT
- DISPLACEMENT:
- 666 CC
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 79.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
$154.23Qty in Cart: 0Quantity:Price:$154.23Subtotal: -
Wiseco Yamaha YSR50 1987-1992 Piston Kit 598M04300
WISECO
$129.95Stock pistons in your YSR50 can't handle sustained performance demands or aggressive tuning without premature wear. Wiseco's 598M04300 piston kit delivers OEM-quality fitment with advanced materials engineered to survive higher combustion pressures,...598M04300- SKU:
- 598M04300
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 56,6 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +3,00 MM
- BORE SIZE METRIC:
- 43.00 MM
- PISTON MATERIAL:
- ALUMINUM
$129.95Qty in Cart: 0Quantity:Price:$129.95Subtotal: -
Wiseco Piston Standard Suzuki RM 250 1987-1988 558M06700
WISECO
$199.95The piston is the engine's hardest-working component—it must withstand thousands of combustion cycles while maintaining precise tolerances. A worn or substandard piston compromises compression, throttle response, and overall reliability. The Wiseco...558M06700- SKU:
- 558M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 246 CC
- STROKE LENGTH:
- 70,00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 67.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 70.00 MM
- UNITS:
- EACH
$199.95 -
Wiseco Piston Kit 48.50 mm Bore Suzuki RM 80 1989-1990 579M04850
WISECO
$134.95Your Suzuki RM80's performance ceiling is limited by its original piston—worn tolerances, outdated combustion geometry, and material fatigue all rob you of horsepower and throttle response. The Wiseco 579M04850 replaces these constraints with...579M04850- SKU:
- 579M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 48.50 MM
- DISPLACEMENT:
- 82 CC
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
$134.95 -
Wiseco 81.00mm Piston Kit for Kawasaki 1100 STX 1997-1999 809M08100
WISECO
$149.95If you're running a Kawasaki 1100 STX and want reliable power gains without compromising engine longevity, a quality piston kit is non-negotiable. The Wiseco 809M08100 delivers the precision engineering and durability that serious riders demand, whether...809M08100- SKU:
- 809M08100
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 1097 CC
- DISPLACEMENT:
- 760 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 81.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON
$149.95 -
WISECO Piston - Standard - Kawasaki KX 125 822M05400
WISECO
$144.95Your Kawasaki KX125 demands a piston built to handle the sustained heat and pressure of competitive riding. The Wiseco 822M05400 combines high-silicon aluminum alloy with precision CNC machining to deliver the durability and combustion efficiency your...822M05400- SKU:
- 822M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$144.95
