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
-
On Sale
ATHENA Piston Kit S4F06900001C
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95High-performance pistons demand materials engineered to withstand extreme combustion pressures and thermal stress—the ATHENA Piston Kit S4F06900001C delivers exactly that using the same 2618 silicium...09100170- SKU:
- 09100170
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 220 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 68.96 MM
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- C
- UNITS:
- KIT
MSRP: $162.95Now: $147.00Was: $162.95Qty in Cart: 0Quantity:Price:MSRP: $162.95Now: $147.00Was: $162.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06900001A
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95Maximum engine longevity and consistent peak performance demand pistons engineered to the exact tolerances of professional racing applications. The ATHENA Piston Kit S4F06900001A delivers the same...09100168- SKU:
- 09100168
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 220 CC
- TYPE:
- A
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 68.94 MM
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
MSRP: $162.95Now: $147.00Was: $162.95Qty in Cart: 0Quantity:Price:MSRP: $162.95Now: $147.00Was: $162.95Subtotal: -
Wiseco 4-Stroke Forged Piston Kit 95mm 11:1 CR for KTM 520 EXC 2000-2002 520 SX 2000-2002 525 SX 2003-2006 525 XC 2008-2010 PK1850
WISECO
$392.95If you're rebuilding a KTM 4-stroke or pushing your bike to competitive limits, piston quality directly impacts engine longevity and throttle response. The Wiseco PK1850 pairs aerospace-grade forged...09031161- SKU:
- 09031161
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 510 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$392.95 -
Wiseco Piston Kit with Gasket for Yamaha YZ125 2005-2020 PK1572
WISECO
$224.95The Wiseco PK1572 is engineered for 2-stroke riders who refuse to compromise on reliability or performance. Whether you're chasing lap times or putting in trail miles, a worn piston and ring pack...09031160- SKU:
- 09031160
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 134 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit with Gasket for Kawasaki KX100 2014-2021 PK1910
WISECO
$189.95A worn or damaged piston directly compromises your KX100's combustion efficiency, throttle response, and overall reliability—especially if you're pushing the engine hard in competition or trail...09031154- SKU:
- 09031154
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- PRO-LITE
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 99 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Piston Kit with Gasket for Kawasaki KX100 2014-2020 PK1908
WISECO
$192.95When your KX100's top-end starts to lose compression and throttle response suffers, a quality piston kit is the difference between limping through the season and reclaiming peak performance. The...09031152- SKU:
- 09031152
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 52.45 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 99 CC
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 52.50 MM
- STROKE LENGTH METRIC:
- 45.80 MM
$192.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1907
WISECO
$179.95When your KX85's top end starts showing signs of wear, a quality piston kit is non-negotiable for maintaining compression, throttle response, and reliability. The Wiseco PK1907 delivers a complete...09031151- SKU:
- 09031151
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +2,00 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 50.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 50.50 MM
- MODEL:
- PRO-LITE
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 84.9 CC
- STROKE LENGTH METRIC:
- 45.80 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Suzuki JR 50 1978-2006 Piston Kit with Gaskets 41mm PK1665
WISECO
$171.95The Wiseco PK1665 is a complete top-end rebuild solution engineered for the Suzuki JR 50's demanding 2-stroke environment. Whether you're dealing with worn compression or preparing for sustained...09030926- SKU:
- 09030926
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 40.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 37.80 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 49 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 41.00 MM
- PRODUCT NAME:
- REBUILD KIT
$171.95 -
Wiseco Piston Kit with Gaskets for KTM 105 SX 2010-2011 PK1644
WISECO
$236.95When your 2-stroke top-end is worn, you're losing power, throttle response, and reliability. The Wiseco PK1644 restores your KTM 105 SX to factory performance specs with aerospace-grade components...09030925- SKU:
- 09030925
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 52.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 104 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.95 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 51.95 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$236.95Qty in Cart: 0Quantity:Price:$236.95Subtotal: -
Wiseco 47mm Piston Kit for KTM 85 SX 2003-2012 PK1639
WISECO
$174.95When your 2-stroke engine demands a fresh top-end, settling for OEM parts leaves performance on the table. The Wiseco PK1639 delivers a complete piston kit engineered from aerospace-grade 4032...09030924- SKU:
- 09030924
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 47.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 48.95 MM
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 46.95 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco KX125 1999-2000 Piston Kit with Gaskets PK1608
WISECO
$230.95If you're running a KX125 two-stroke and want to restore lost compression or build toward more aggressive power outputs, a quality piston kit is non-negotiable. The Wiseco PK1608 gives you everything...09030923- SKU:
- 09030923
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 54.00 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
$230.95 -
Wiseco Piston Kit for Yamaha YZ250 1999-2001 PK1573
WISECO
$277.95When your YZ250's piston and ring package shows wear, power delivery suffers—and so does your lap times. The Wiseco PK1573 rebuilds your top end with aerospace-grade 4032 aluminum that handles...09030921- SKU:
- 09030921
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
$277.95 -
Wiseco Piston Kit 43mm for Kawasaki KX60 1985-2003 PK1506
WISECO
$172.95A worn or damaged piston directly kills engine performance, response, and reliability—especially in high-revving 2-stroke competition engines. The Wiseco PK1506 is a complete top-end solution...09030920- SKU:
- 09030920
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 60 CC
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- STROKE LENGTH METRIC:
- 41.60 MM
- BORE SIZE METRIC:
- 43.00 MM
- PISTON DIAMETER METRIC:
- 42.94 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$172.95 -
Wiseco 125 SX 2002-2006 Piston Kit with Gaskets PK1512
WISECO
$225.95When you're rebuilding a 125 SX top end or looking to restore your engine to factory specifications, you need a piston kit that combines precision engineering with comprehensive components. Wiseco's...09030699- SKU:
- 09030699
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$225.95 -
Wiseco YZ125 2005-2020 Piston Kit with Gaskets PK1392
WISECO
$249.95The YZ125 demands a piston kit engineered for reliability under intense 2-stroke conditions. Wiseco's PK1392 delivers high-silicon forged aluminum construction that withstands extreme combustion...09030682- SKU:
- 09030682
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 58.00 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +4,00 MM
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
Wiseco Piston Kit 56mm for Yamaha YZ125X 2020-2022 PK1391
WISECO
$239.95When your YZ125X's top-end reaches the end of its service life, a quality piston kit is the difference between a reliable rebuild and premature failure. The Wiseco PK1391 delivers OEM-equivalent...09030681- SKU:
- 09030681
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- COOLING SYSTEM:
- AIR COOLED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 134 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
WSM Piston Kit - K1100 - Standard 010-821PK
WSM
$98.28When you're building or rebuilding an engine, piston quality directly impacts power output, reliability, and longevity. The WSM K1100 Piston Kit delivers OEM-equivalent construction with engineering...010821P- SKU:
- 010821P
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- MODEL:
- PLATINUM
$98.28 -
WSM Piston Kit - K1100 - +.25 mm 010-821-04PK
WSM
$98.28High-performance pistons are the foundation of reliable power delivery under sustained boost and RPM, and OEM units often compromise on thermal management and durability. The WSM K1100 Piston Kit...01082104P- SKU:
- 01082104P
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$98.28 -
WSM Piston Kit - K1100 - +.5 mm 010-821-05PK
WSM
$93.60Whether you're chasing tighter tolerances in a rebuild or maximizing power output in a high-revving engine, OEM pistons often fall short of what serious builders demand. The WSM Piston Kit delivers...01082105P- SKU:
- 01082105P
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
On Sale
PROX Piston Kit 01.1408.150
PROX
MSRP: $185.95Now: $158.00Was: $185.95When your engine demands reliability under extreme conditions, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.1408.150 delivers factory-matched performance with the precision engineering...09030820- SKU:
- 09030820
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- PISTON SIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
MSRP: $185.95Now: $158.00Was: $185.95
