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 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...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...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...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...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
$154.23Qty in Cart: 0Quantity:Price:$154.23Subtotal: -
Wiseco Piston 78.50mm Sea-Doo GTX 1994-1995 663M07850
WISECO
$159.95When 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...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
$159.95 -
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...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...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,...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
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
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...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
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
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...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...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
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit 47.5mm for 2003-2007 Honda CR85R 833M04750
WISECO
$117.95The Wiseco Piston Kit is essential for CR85R riders pushing their bikes to the limit. A worn or stock piston limits combustion efficiency and heat management, directly impacting power output and...833M04750- SKU:
- 833M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 47,80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84,7 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 47.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
Wiseco Piston Kit with Gasket for KTM 65 SX 2009-2024 PK1882
WISECO
$174.95If you're rebuilding your KTM 65 SX or looking to restore lost compression and throttle response, a quality piston kit is non-negotiable. The Wiseco PK1882 delivers the precision engineering and...09031127- SKU:
- 09031127
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 45.00 MM
- PISTON DIAMETER METRIC:
- 44.95 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 40.80 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit with Gasket KTM 250 SX 2007-2014 PK1884
WISECO
$274.95When you're pushing your KTM 250 SX to its limits, a worn or damaged piston compromises both power delivery and engine reliability. The Wiseco PK1884 piston kit restores peak combustion efficiency...09031129- SKU:
- 09031129
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP SERIES
- PISTON DIAMETER METRIC:
- 66.32 MM
- BORE SIZE METRIC:
- 66.40 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$274.95 -
Wiseco Piston Kit for Suzuki RM-Z450 2013-2022 12.5:1 Compression PK1891
WISECO
$324.95If you're running your RM-Z450 at the edge of its limits, stock pistons won't cut it. The Wiseco PK1891 kit delivers the durability and combustion efficiency serious racers demand, with a 12.5:1...09031136- SKU:
- 09031136
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- STROKE LENGTH METRIC:
- 62.10 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.95 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$324.95 -
Wiseco Suzuki RM-Z 450 2013-2022 Piston Kit 13:1 Compression PK1893
WISECO
$344.95If you're running a 2013-2022 Suzuki RM-Z 450, a worn or stock piston limits your engine's potential—costing you power, throttle response, and reliability when you need it most. The Wiseco PK1893...09031138- SKU:
- 09031138
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 95.95 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 62.10 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
- SKIRT COATING:
- ARMORGLIDE®
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Piston Kit with Gasket for 2013-2018 KTM 450 SX-F PK1898
WISECO
$359.95The Wiseco PK1898 piston kit delivers the durability and performance your 450 SX-F demands, whether you're pushing hard on the track or putting in serious trail hours. Precision-forged construction...09031142- SKU:
- 09031142
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.95 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 95.00 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 63.40 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$359.95Qty in Cart: 0Quantity:Price:$359.95Subtotal: -
Wiseco Yamaha YZ450F 2014-2017 Piston Kit with Gasket PK1900
WISECO
$289.95The Wiseco PK1900 piston kit restores lost compression and combustion efficiency in high-mileage YZ450F engines, delivering measurable gains in throttle response and power delivery. Whether you're...09031144- SKU:
- 09031144
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE SIZE METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 96.95 MM
- DISPLACEMENT:
- 449 CC
- SKIRT COATING:
- ARMORGLIDE®
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.80 MM
- UNITS:
- KIT
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Wiseco Piston Kit Suzuki DR650S 1990-1993 4597M09600
WISECO
$239.95Stock pistons lose efficiency and durability under demanding riding conditions—whether you're pushing your DR650S on technical trails or logging highway miles. The Wiseco piston kit restores and...09101659- SKU:
- 09101659
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 654 CC
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 90.40 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Yamaha XT500 1976-1981 87.50mm 9:1 4764M08750
WISECO
$239.95Your XT500 or TT500 demands a piston engineered for reliability under sustained high RPM and load—factory units wear quickly in demanding riding conditions. The Wiseco 4764M08750 kit delivers a...09101666- SKU:
- 09101666
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- BORE - OVERSIZE METRIC:
- +0.05 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 505 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,05 MM
- BORE SIZE METRIC:
- 87.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 84.00 MM
- UNITS:
- EACH
$239.95
