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 +2.00 mm Suzuki RM 125 1990-2003 754M05600
WISECO
$174.95If you're pushing your RM 125 to the limit, a +2.00 mm oversized piston unlocks measurable gains in compression ratio and combustion efficiency—directly translating to stronger top-end pull and more consistent power delivery across the RPM band. Wiseco's...754M05600- SKU:
- 754M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
$174.95 -
Wiseco Piston Kit for Suzuki RM 125 2000-2003 55.50 mm 754M05550
WISECO
$177.95If you're pushing your Suzuki RM 125 to its limits on the track or trail, factory pistons won't cut it. The Wiseco +1.50 mm piston kit delivers the strength and precision needed for sustained high-RPM performance without sacrificing reliability. Built...754M05550- SKU:
- 754M05550
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 55.50 MM
- DISPLACEMENT:
- 124,8 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- +1.50 MM
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$177.95 -
Wiseco Piston Kit 55mm Oversize for Suzuki RM125 2000-2003 754M05500
WISECO
$160.95If you're running a 2000-2003 Suzuki RM125 at the edge of its limits, a stock piston won't cut it. The Wiseco 55mm Oversize (+1.00mm) Piston Kit delivers the compression ratio and durability needed to extract real power gains while maintaining...754M05500- SKU:
- 754M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- STROKE LENGTH:
- 54,50 MM
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston 54.50 mm Oversize for Suzuki RM 125 2000-2003 754M05450
WISECO
$160.95When you're pushing your RM 125 to the limit, your piston needs to match your ambition. The Wiseco 54.50 mm oversize piston delivers the strength and precision required to handle high-RPM racing demands while improving power output and engine reliability...754M05450- SKU:
- 754M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit 46.50mm Oversize for Kawasaki KX65 2000-2009 2011-2021 752M04650
WISECO
$134.95If you're running a KX65 at the limits of stock capability, you'll hit a performance ceiling fast. The Wiseco 46.50mm oversize piston kit delivers measurable gains in horsepower and torque while maintaining the reliability needed for consistent racing...752M04650- SKU:
- 752M04650
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 46.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 64 CC
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 41,60 MM
- STROKE LENGTH METRIC:
- 41.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Standard 44.5mm Bore 2000-2025 Kawasaki KX65 Suzuki RM65 752M04450
WISECO
$128.95When you're pushing your KX65 or RM65 to the limit on the track, your piston needs to handle extreme combustion pressures and sustained RPMs without compromise. The Wiseco Piston Kit delivers the durability and power output you need to stay competitive,...752M04450- SKU:
- 752M04450
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- STROKE LENGTH:
- 41,60 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- UNITS:
- EACH
$128.95 -
Wiseco Piston +2.00 mm Gas Gas MC 125 2002-2025 726M05600
WISECO
$179.95If you're pushing your Gas Gas MC 125 to its limits, a worn or stock piston will hold you back. The Wiseco +2.00 mm piston delivers the compression ratio and durability you need to extract maximum horsepower while maintaining reliability through intense...726M05600- SKU:
- 726M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- STROKE LENGTH:
- 54,50 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$179.95 -
Wiseco Piston Kit Yamaha YZ 125 2005-2021 56mm 726M05500
WISECO
$154.95When you're pushing your YZ 125 to its limits, factory pistons become the limiting factor. The Wiseco +1.00mm piston kit delivers the compression ratio and durability you need to extract reliable horsepower gains without sacrificing longevity—whether...726M05500- SKU:
- 726M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STROKE LENGTH:
- 54,50 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 1.00 mm Oversize for Yamaha YZ 250 1999-2022 677M06900
WISECO
$210.95If you're running a YZ 250 in competitive trail or race conditions, a worn or stock piston limits your engine's potential for power and reliability. The Wiseco +1.00 mm piston kit delivers the compression increase and durability you need to extract...677M06900- SKU:
- 677M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 68.00 MM
- DISPLACEMENT:
- 246,8 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 68,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$210.95 -
Wiseco Piston Kit Yamaha YZ250 1999-2001 804M06640
WISECO
$199.95If you're pushing your YZ250 or WR250 to the limit, factory pistons won't cut it. The Wiseco High-Performance Piston Kit delivers the durability and power output serious racers demand, with advanced materials and coatings engineered to withstand...677M06800- SKU:
- 677M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 68.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 246,8 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 68.00 MM
$199.95 -
Wiseco Piston 2.00mm Oversize Honda CR125R 1987 676M05600
WISECO
$179.95When you're pushing a CR125R to its limits, stock pistons won't cut it. The Wiseco 2.00mm oversize piston delivers the reliability and compression you need to extract maximum power without sacrificing longevity. Built for serious racers who demand...676M05600- SKU:
- 676M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- STROKE LENGTH:
- 54,50 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- 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
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$179.95 -
Wiseco Piston Standard Yamaha PW 50 1981-2020 653M04000
WISECO
$109.95Your PW 50's performance hinges on reliable internal components, and a quality piston is non-negotiable. The Wiseco 653M04000 delivers the durability and power output serious riders demand, whether you're putting in track time or tackling technical...653M04000- SKU:
- 653M04000
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 40.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 39,20 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- DISPLACEMENT:
- 49 CC
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
WISECO Piston - Standard - Kawasaki KX 125 652M05400
WISECO
$162.95The Wiseco 652M05400 piston delivers the reliability and performance you need to keep your KX 125 competitive lap after lap. Built from high-silicon forged aluminum with a structurally advanced design, this piston handles the demands of both trail and...652M05400- SKU:
- 652M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$162.95 -
Wiseco Piston Kit 53mm Bore Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05300
WISECO
$143.95If you're running a Kawasaki KX100 or Suzuki RM100, piston wear directly impacts throttle response, compression, and overall engine reliability. The Wiseco 651M05300 delivers a precision-engineered replacement that restores your engine's original...651M05300- SKU:
- 651M05300
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STROKE LENGTH:
- 45,80 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 53.00 MM
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
$143.95 -
Wiseco Piston Kit 52.50mm Bore Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05250
WISECO
$143.95If you're running a KX100 or RM100 at the track or trail, piston wear directly impacts your power output and engine reliability. The Wiseco 651M05250 delivers a precision-engineered replacement that restores—or exceeds—OEM performance while improving...651M05250- SKU:
- 651M05250
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.50 MM
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
$143.95 -
Wiseco Piston Kit 48.00 mm Oversize for Yamaha PW80 2001-2006 649M04800
WISECO
$134.95If you're rebuilding a Yamaha PW80 or BW80 engine, a worn piston directly impacts throttle response, fuel efficiency, and overall reliability. The Wiseco 48.00mm oversize kit restores—or exceeds—factory performance by pairing high-silicon aluminum with...649M04800- SKU:
- 649M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 42.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 42,00 MM
- BORE SIZE METRIC:
- 48.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON
$134.95 -
Wiseco Piston 50mm Overbore Yamaha YZ125 2005-2025 647M05450
WISECO
$154.95Your YZ125's performance ceiling is limited by worn or stock pistons—and a quality replacement is the foundation of any serious build. The Wiseco 647M05450 delivers forged-aluminum durability and precision bore geometry that unlocks consistent power...647M05450- SKU:
- 647M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Standard Yamaha YZ125 1994-1996 647M05400
WISECO
$162.95If you're running a 1994-1996 Yamaha YZ125, piston wear directly impacts throttle response, compression, and overall engine reliability. A worn or damaged piston forces you to compensate with tuning adjustments and risks catastrophic engine failure...647M05400- SKU:
- 647M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
$162.95 -
Wiseco Piston Standard Yamaha YZ 80 1993-2001 646M04700
WISECO
$134.95The Wiseco 646M04700 piston is essential for YZ80 riders who demand reliable performance without compromise. Built from high-silicon forged aluminum, this piston delivers the strength needed for consistent power delivery across demanding riding...646M04700- SKU:
- 646M04700
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 47,80 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH METRIC:
- 47.80 MM
$134.95 -
Wiseco Piston Kit 48.50 mm for Kawasaki KX 80 1988-2000 644M04850
WISECO
$134.95Stock pistons can't handle the demands of extended trail riding or track time—especially in a high-revving two-stroke like the KX 80. This Wiseco piston kit delivers the durability and compression optimization your engine needs to maintain peak...644M04850- SKU:
- 644M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 82 CC
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$134.95
