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 Yamaha YZ65 2018-2026 43.5mm 885M04350
WISECO
$127.95The Wiseco 885M04350 piston kit is engineered to deliver the durability and precision your YZ65 demands, whether you're racing competitively or pushing hard on the trail. Stock pistons wear quickly under aggressive riding—this kit replaces them with...09105380- SKU:
- 09105380
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 43.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$127.95 -
Wiseco Piston Kit 50mm 2002-2020 Suzuki RM85 RE901M05000
WISECO
$134.95The Wiseco RE901M05000 Racer Elite piston kit is engineered to deliver the durability and precision your Suzuki RM85 demands, whether you're pushing lap times or tackling demanding terrain. Factory pistons wear quickly under high RPM and aggressive...09105108- SKU:
- 09105108
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$134.95 -
Wiseco Piston Kit 53mm for 2002-2009 Suzuki RM85 RE901M05300
WISECO
$169.95Stock pistons in the RM85 platform wear quickly under competitive riding conditions, robbing you of compression and throttle response. The Wiseco RE901M05300 Racer Elite kit delivers OEM-grade reliability with measurably improved ring seal and detonation...09105110- SKU:
- 09105110
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
Wiseco RM125 2004-2007 Piston Kit RE914M05400
WISECO
$204.95The Wiseco RE914M05400 Racer Elite piston kit delivers the compression, durability, and throttle response your RM125 demands during competition or high-intensity riding. With ArmorPlating detonation shielding and a precision-engineered skirt coating,...09105111- SKU:
- 09105111
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Suzuki RM125 2004-2007 56mm Piston Kit RE914M05600
WISECO
$204.95If you're running a Suzuki RM125 at the edge of its limits, you need a piston kit engineered to handle the punishment. The Wiseco RE914M05600 Racer Elite delivers the compression, durability, and throttle response required for competitive racing and...09105112- SKU:
- 09105112
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95 -
Wiseco Piston Kit Yamaha YZ85 2002-2021 47.50mm RE900M04750
WISECO
$171.95The Wiseco Piston Kit is engineered for the Yamaha YZ85 to deliver the durability and sealing performance required in high-demand 2-stroke racing environments. Whether you're rebuilding after a season or maximizing power output, this kit combines premium...09105116- SKU:
- 09105116
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
Wiseco 2-Stroke Piston Kit 48mm Oversize Yamaha YZ85 2002-2025 RE900M04800
WISECO
$134.95The Wiseco RE900M04800 is purpose-built for YZ85 racers who demand reliability when it matters most. Whether you're chasing podiums or rebuilding after hard use, this 48mm oversize piston kit restores your engine to peak performance while delivering the...09105117- SKU:
- 09105117
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm Yamaha YZ125 2005-2024 RE905M05400
WISECO
$221.95The Wiseco Piston Kit RE905M05400 delivers the reliability and power output that YZ125 racers demand. Built from premium 2000 Series forged alloy, this piston withstands the extreme combustion pressures of competitive two-stroke racing while maintaining...09105120- SKU:
- 09105120
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
$221.95Qty in Cart: 0Quantity:Price:$221.95Subtotal: -
Wiseco YZ125 2005-2020 Racer Elite Piston Kit RE905M05600
WISECO
$204.95The YZ125 demands a piston that can handle sustained high RPM racing without compromise. Wiseco's Racer Elite kit delivers the precision fitment and durability required for consistent top-end performance, whether you're chasing podiums or pushing your...09105121- SKU:
- 09105121
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$204.95 -
Wiseco Piston Kit Racer Elite Yamaha YZ125 2005-2021 RE906M05800
WISECO
$204.95A worn or damaged piston directly impacts combustion efficiency, throttle response, and engine longevity—especially in high-rpm 2-stroke applications like the YZ125. The Wiseco Racer Elite kit replaces compromised internals with precision-engineered...09105122- SKU:
- 09105122
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +4.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +4,00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95 -
Wiseco YZ250 1999-2024 Racer Elite Piston Kit 66.40mm RE902M06640
WISECO
$249.95The piston is the powerhouse of your 2-stroke engine—it's where combustion converts to acceleration. A worn or undersized piston kills compression, throttle response, and overall performance. The Wiseco RE902M06640 Racer Elite Kit restores that lost...09105123- SKU:
- 09105123
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
Wiseco Piston Kit with Gaskets for 2003 Suzuki RM100 PK1155
WISECO
$179.95A worn top-end can quietly rob your RM100 of power and responsiveness. The Wiseco PK1155 restores lost compression and combustion efficiency with aerospace-grade forged aluminum pistons machined to exact tolerances, so you get reliable throttle response...09030181- SKU:
- 09030181
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 53.00 MM
- DISPLACEMENT:
- 99 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 52.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets PK1218
WISECO
$184.95A worn or damaged piston directly compromises your CR85R's compression, throttle response, and overall reliability—especially critical in competitive or high-demand riding. The Wiseco PK1218 restores your top-end to OEM specifications with...09030183- SKU:
- 09030183
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- BORE SIZE METRIC:
- 50.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +3,00 MM
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 50.45 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit for Honda XR250R 1986-2004 74mm 10.5:1 Compression PK1221
WISECO
$257.95The stock piston in your XR250R will eventually show signs of wear—especially if you're pushing the engine hard or running higher octane fuel for increased performance. The Wiseco PK1221 restores compression integrity and adds measurable power while...09030193- SKU:
- 09030193
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE SIZE METRIC:
- 74.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 73.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
$257.95Qty in Cart: 0Quantity:Price:$257.95Subtotal: -
Wiseco Honda XR200R 1992-2002 66.5mm Piston Kit with Gaskets PK1126
WISECO
$204.95The Wiseco PK1126 Piston Kit is engineered for riders who demand reliability and measurable performance gains from their Honda XR200R. Whether you're rebuilding after high-mileage wear or upgrading for competitive advantage, this kit delivers the...09030201- SKU:
- 09030201
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- +1,00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE SIZE METRIC:
- 66.50 MM
- DISPLACEMENT:
- 192 CC
- PISTON DIAMETER METRIC:
- 66.45 MM
- TYPE:
- TOP END
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Honda CR250R 1997-2001 Piston Kit with Gaskets 67.50mm PK1170
WISECO
$259.95If you're rebuilding the top end of a 1997-2001 Honda CR250R, you need a piston kit engineered to withstand the demands of two-stroke racing. The Wiseco PK1170 delivers the compression consistency and durability required to restore full power output...09030208- SKU:
- 09030208
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 67.46 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
$259.95Qty in Cart: 0Quantity:Price:$259.95Subtotal: -
Wiseco Yamaha PW50 1981-2020 Piston Kit 41mm PK1161
WISECO
$149.95A worn top-end can rob your PW50 of power and reliability—the Wiseco PK1161 gives you a straightforward path back to peak performance. This complete piston kit delivers the precision machining and durable materials you need for a rebuild that lasts,...09030269- SKU:
- 09030269
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- UNITS:
- EACH
- BORE SIZE METRIC:
- 41.00 MM
- MODEL:
- RACER'S CHOICE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal: -
Wiseco 66mm 10.25:1 Piston Kit for 1992-2002 Honda XR200R PK1125
WISECO
$204.95Whether you're rebuilding a worn XR200R or restoring a dormant XL185S to peak performance, a quality piston kit is essential for reliable power delivery and engine longevity. The Wiseco PK1125 delivers OEM-equivalent fitment with precision CNC-machined...09030270- SKU:
- 09030270
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 192 CC
- PISTON DIAMETER METRIC:
- 65.95 MM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Yamaha YZ85 2002-2018 Piston Kit with Gaskets PK1343
WISECO
$214.95When your YZ85's top-end starts losing compression or showing signs of wear, a quality piston kit is essential to restore engine performance and reliability. The Wiseco PK1343 delivers OEM-spec fitment with precision CNC machining and aerospace-grade...09030271- SKU:
- 09030271
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 103,5 CC
- MODEL:
- RACER'S CHOICE
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.50 MM
- COOLING SYSTEM:
- LIQUID COOLED
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
$214.95Qty in Cart: 0Quantity:Price:$214.95Subtotal: -
Wiseco Piston Kit with Gaskets 40mm Bore for Yamaha PW50 1981-2025 PK1157
WISECO
$171.95A worn or damaged piston directly throttles your PW50's performance, causing compression loss, poor throttle response, and accelerated engine wear. The Wiseco PK1157 restores full compression integrity and thermal efficiency with precision-forged...09030275- SKU:
- 09030275
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 40.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- RACER'S CHOICE
$171.95
