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 90mm 12.2:1 Compression for Suzuki DR-Z400 2000-2004 4713M09000
WISECO
$238.95If you're running a Suzuki DR-Z400 and want measurable gains in power output without sacrificing engine longevity, a quality piston upgrade is one of the most direct paths to that goal. The Wiseco 4713M09000 delivers a 12.2:1 compression ratio that...4713M09000- SKU:
- 4713M09000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 398 CC
- PISTON DIAMETER METRIC:
- 89.92 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.60 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- ATV
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 90.00 MM
$238.95 -
Wiseco Piston Kit 90mm 13.5:1 Compression Arctic Cat DVX 400 2004-2008 Kawasaki KFX 400 2003-2006 Suzuki DR-Z 400 2000-2004 4714M09000
WISECO
$219.95If you're running a 400cc ATV and want measurable gains in power delivery without sacrificing reliability, a high-compression piston upgrade is one of the most effective modifications you can make. The Wiseco 4714M09000 raises your compression ratio to...4714M09000- SKU:
- 4714M09000
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 62.60 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$219.95 -
Wiseco Piston Yamaha YT175 1982-1983 471M06600
WISECO
$162.95If your Yamaha YT175 is showing signs of worn pistons—loss of compression, increased blowby, or sluggish throttle response—a quality replacement is essential to restore engine efficiency and prevent further damage. The Wiseco 471M06600 delivers the...471M06600- SKU:
- 471M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 65.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 172 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
$162.95 -
Wiseco 66.00mm Piston Kit for Honda CR250R 1981-1983 466M06600
WISECO
$199.95If you're running a CR250R that demands reliability under race conditions or high-RPM trail abuse, a worn piston directly kills performance and invites catastrophic failure. The Wiseco 466M06600 delivers the precision bore diameter and material science...466M06600- SKU:
- 466M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PISTON DIAMETER METRIC:
- 65.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 72.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
$199.95 -
Wiseco Piston Kit 39.50mm for KTM 50 SX 2009-2022 874M03950
WISECO
$121.95The Wiseco 874M03950 Pro-Lite Piston Kit is engineered to maximize combustion efficiency and responsiveness in your KTM 50 SX, delivering the precision tolerances and lightweight construction that competitive riders demand. Whether you're chasing lap...09103963- SKU:
- 09103963
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- DISPLACEMENT:
- 49 CC
- BORE SIZE METRIC:
- 39.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
$121.95Qty in Cart: 0Quantity:Price:$121.95Subtotal: -
Wiseco Piston Kit Kawasaki KX85 2014-2024 879M04850
WISECO
$132.95The Kawasaki KX85 demands a piston that can handle the demands of 2-stroke racing without compromise. Wiseco's 879M04850 delivers the precision tolerances and material durability needed to sustain peak power output while resisting the thermal stress and...09103964- SKU:
- 09103964
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$132.95 -
Wiseco Piston Kit Kawasaki KX100 2014-2021 880M05250
WISECO
$138.95Your KX100's factory piston won't cut it if you're pushing harder on the track or trail. The Wiseco 880M05250 Pro-Lite delivers measurable gains in compression efficiency and engine durability through precision engineering and high-silicon aluminum...09103965- SKU:
- 09103965
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
Wiseco Piston Kit Kawasaki KX450F 2013-2018 12.5:1 Compression 40082M09600
WISECO
$255.95If you're running a KX450F at the edge of its limits, a worn or stock piston limits your engine's potential for power and reliability. The Wiseco 40082M09600 delivers a 12.5:1 compression ratio that extracts measurable gains in horsepower and torque...09103172- SKU:
- 09103172
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$255.95Qty in Cart: 0Quantity:Price:$255.95Subtotal: -
Wiseco Piston Kit Racer Elite 96mm 14:1 Compression Honda TRX450R 2006-2009 RE817M09600
WISECO
$388.95If you're running a Honda TRX450R or TRX450ER, this piston kit delivers the compression ratio and durability you need to extract real power gains without compromising reliability. The 14:1 compression ratio increases torque response and throttle snap,...09105126- SKU:
- 09105126
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- ATV
$388.95 -
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
$221.95 -
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:
