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
-
Wossner Piston Kit 53.95mm 2014-2025 Husqvarna TC125 8220DA
WOSSNER
$122.00When you're pushing a TC125 to its limits, your piston becomes the critical link between combustion and power delivery. The Wössner 8220DA keeps that link strong with purpose-built engineering that handles the thermal stress and repetitive load cycles...09104884- SKU:
- 09104884
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
$122.00 -
Wossner Piston Kit 53.96mm 2007-2023 KTM 125 SX 8220DB
WOSSNER
$122.00When your 2-stroke engine demands reliability under sustained high-load conditions, OEM pistons fall short of the mark. The Wössner 8220DB delivers the durability and reduced friction that separates competitive edge from engine failure, using...09104885- SKU:
- 09104885
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.01 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$122.00 -
Wossner 85.93mm Piston Kit Kawasaki KX500 1988-2004 8228DA
WOSSNER
$192.00The Wossner 85.93mm Piston Kit is engineered for KX500 2-stroke engines that demand reliability through extended competition seasons and high-RPM abuse. A complete top-end refresh with Wossner's German-precision forging ensures your engine maintains...09104889- SKU:
- 09104889
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 499 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 86.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 85.93 MM
$192.00 -
Wossner Piston Kit for KTM 65 SX 2009-2025 8241DA
WOSSNER
$102.00If you're running a KTM 65 SX and serious about consistent power delivery across repeated heat cycles, a quality piston kit is non-negotiable. The Wossner 8241DA replaces worn pistons that cause compression loss, increased blowby, and unpredictable...09104890- SKU:
- 09104890
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 45.02 MM
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 44.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$102.00 -
Wossner Piston Kit 45.03mm for KTM 65 SX 2009-2025 Husqvarna TC65 2017-2025 GasGas MC65 2021-2025 8241DB
WOSSNER
$102.00The Wossner Piston Kit 8241DB delivers the precision engineering and durability demanded by serious 2-stroke racers and mechanics. Factory OEM pistons wear quickly under high RPM loads—this German-engineered kit extends engine life while maintaining the...09104891- SKU:
- 09104891
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.03 MM
- TYPE:
- SINGLE RING
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 44.97 MM
- RIDING STYLE:
- OFF-ROAD
$102.00 -
Wossner Piston Kit Honda CR125R 1985-1986 8127DA
WOSSNER
$132.00If you're rebuilding a CR125R or pushing your engine harder, piston longevity and ring seal integrity directly impact reliability and power delivery. The Wossner 8127DA delivers German-engineered precision with a complete installation package,...09105542- SKU:
- 09105542
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- PISTON SIZE METRIC:
- 53.94 MM
$132.00 -
Wossner Piston Kit Kawasaki KX250 1987-1989 67.35mm 8129DB
WOSSNER
$162.00Two-stroke engines demand pistons engineered for extreme combustion pressures and rapid cycling—stock components simply can't handle sustained high-RPM performance. The Wossner 8129DB delivers the durability and precision your KX250 needs to stay...09105545- SKU:
- 09105545
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 67.41 MM
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
$162.00Qty in Cart: 0Quantity:Price:$162.00Subtotal: -
Wossner Piston Kit Yamaha YZ250 1988-1991 8134D150
WOSSNER
$182.00If you're running a YZ250 two-stroke and want reliable power without sacrificing durability, a quality piston kit is non-negotiable. The Wossner 8134D150 delivers the precision engineering and material science that separates a dependable motor from one...09105549- SKU:
- 09105549
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 69.50 MM
- PISTON SIZE METRIC:
- 69.44 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +1,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$182.00 -
VERTEX Piston Kit 23641A
VERTEX
$302.95Whether you're rebuilding after high-mileage wear or stepping up to forged internals for increased boost tolerance, the VERTEX Piston Kit 23641A delivers the strength and precision needed to support your engine's demands. VERTEX's combination of advanced...09102073- SKU:
- 09102073
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- DISPLACEMENT:
- 350 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- PISTON DIAMETER METRIC:
- 87.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$302.95 -
Wiseco Piston Kit 96mm 11.5:1 Honda CRF450R 2002-2003 4753M09600
WISECO
$229.95When you're pushing your CRF450R to the limit on the track or trail, your piston is where power meets durability. The Wiseco 4753M09600 delivers the compression ratio and material science you need to extract maximum performance while maintaining the...4753M09600- SKU:
- 4753M09600
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.94 MM
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
Wossner Piston Kit Honda CRF450R 2005-2008 8608DA
WOSSNER
$214.00High-mileage and competition use demand a piston that can handle sustained heat and load cycles without sacrificing reliability. The Wossner 8608DA delivers the durability and friction reduction your CRF450R needs to perform consistently, whether you're...09104944- SKU:
- 09104944
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$214.00 -
Wiseco Racer Elite 2-Stroke Piston Kit Husqvarna TC250 2014-2024 RE912M06640
WISECO
$277.95The Wiseco Racer Elite piston kit is purpose-built for the TC250's extreme combustion environment, delivering the reliability and power consistency that separates competitive racers from the rest. If you're running a 2014-2024 Husqvarna TC250 at the edge...09105104- SKU:
- 09105104
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 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
$277.95Qty in Cart: 0Quantity:Price:$277.95Subtotal: -
Wiseco Piston Kit Suzuki RM85 2002-2023 RE901M04800
WISECO
$134.95The Wiseco Piston Kit RE901M04800 is purpose-built for the Suzuki RM85 (2002-2023), delivering the strength and precision required for competitive racing and high-performance riding. Stock pistons compromise on durability under sustained high RPM and...09105105- SKU:
- 09105105
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE SIZE METRIC:
- 48.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$134.95 -
Wiseco Piston Kit Kawasaki JS550 1991-1995 75.50mm Bore WK1046
WISECO
$349.95A complete piston kit rebuild is essential when your JS550 engine shows signs of wear, loss of compression, or if you're pushing higher RPMs and demand absolute reliability. Wiseco's high-silicon forged aluminum construction delivers the strength needed...WK1046- SKU:
- WK1046
- Availability:
- Ships Same Business Day
- Weight:
- 2.19 LBS
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- PISTON DIAMETER METRIC:
- 75.40 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 537 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$349.95 -
Wossner Piston Kit 53.94mm Yamaha YZ125 2002-2004 8072DA
WOSSNER
$122.00When you're pushing a YZ125 to its limits, piston durability and ring seal integrity are non-negotiable. The Wossner 8072DA is engineered to handle the demands of 2-stroke racing—delivering consistent compression, reduced friction, and the reliability...09104787- SKU:
- 09104787
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 53.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 54.00mm Yamaha YZ125 2002-2004 8072DB
WOSSNER
$122.00When you're pushing a YZ125 to its limits on the track, your piston kit needs to match your ambition. The Wössner 8072DB delivers the durability and precision German engineering demands, with a low-friction skirt coating and forged aluminum construction...09104788- SKU:
- 09104788
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.01 MM
- PISTON SIZE METRIC:
- 53.95 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
VERTEX Piston Kit 23924B
VERTEX
$279.95Whether you're rebuilding a high-mileage engine or constructing a purpose-built race motor, piston quality directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 23924B delivers heat-treated durability and proven...09103331- SKU:
- 09103331
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +3.00 MM
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- DISPLACEMENT:
- 480 CC
- PISTON DIAMETER METRIC:
- 98.97 MM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$279.95 -
VERTEX Piston Kit 23867A
VERTEX
$327.95The VERTEX Piston Kit 23867A delivers the durability and precision needed for serious engine builds, whether you're chasing reliability or maximum performance. Built from premium materials with heat-treatment and advanced surface coatings, these pistons...09103334- SKU:
- 09103334
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- +3,00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 270 CC
- PISTON DIAMETER METRIC:
- 80.96 MM
- RIDING STYLE:
- STREET
- STYLE:
- FORGED BIG BORE
$327.95 -
VERTEX Piston Kit 23867B
VERTEX
$268.95The VERTEX Piston Kit 23867B delivers the reliability and precision your engine demands, whether you're rebuilding stock or pushing performance limits. Engineered with premium materials and heat-treated for durability, this kit ensures faster break-in,...09103335- SKU:
- 09103335
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 270 CC
- PISTON DIAMETER METRIC:
- 80.97 MM
- STYLE:
- FORGED BIG BORE
$268.95 -
VERTEX Piston Kit VTK24370B
VERTEX
$150.95A quality piston kit is the foundation of reliable high-RPM performance and engine longevity. The VERTEX Piston Kit VTK24370B delivers precision-engineered pistons with advanced surface treatments that reduce friction during break-in and extend service...09103146- SKU:
- 09103146
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$150.95
