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
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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
$143.95Qty in Cart: 0Quantity:Price:$143.95Subtotal: -
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
$154.23Qty in Cart: 0Quantity:Price:$154.23Subtotal: -
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
$199.95Qty 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 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 -
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 engine longevity. This precision-engineered replacement...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 durability you need to get back on track—whether you're...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 and durability with precision-engineered components built...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
$274.95Qty in Cart: 0Quantity:Price:$274.95Subtotal: -
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 compression ratio engineered to extract measurable gains in...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®
$324.95Qty in Cart: 0Quantity:Price:$324.95Subtotal: -
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 delivers a measurable jump in compression ratio and...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 combined with ArmorGlide friction reduction keeps your...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 rebuilding after a top-end failure or upgrading for race...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 exceeds OEM performance through precision forging 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
$239.95 -
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 high-silicon alloy construction that resists thermal stress...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
