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
-
VERTEX Piston Kit VTK23630B
VERTEX
$243.95Piston durability directly impacts engine longevity and performance reliability—especially under high-boost or high-RPM conditions where thermal stress accelerates wear. The VERTEX Piston Kit VTK23630B combines advanced heat treatment with a specialized...09103099- SKU:
- 09103099
- Availability:
- Ships Same Business Day
- Weight:
- 1.24 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- STREET
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$243.95Qty in Cart: 0Quantity:Price:$243.95Subtotal: -
VERTEX Piston Kit 23628A
VERTEX
$177.95OEM pistons wear out—especially in high-demand racing and forced-induction applications. The VERTEX Piston Kit 23628A delivers precision-engineered pistons with advanced surface treatments that dramatically reduce friction, accelerate break-in, and...09102113- SKU:
- 09102113
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 52.44 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 104 CC
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$177.95 -
VERTEX Piston Kit 22996B
VERTEX
$171.95The VERTEX Piston Kit 22996B delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a worn top end. Engineered with forged 2618 aluminum and a T-5 heat-treat cycle, these pistons handle high RPM stress...09102127- SKU:
- 09102127
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.93 MM
- STYLE:
- CAST RACE
$171.95 -
VERTEX Piston Kit 23404A
VERTEX
$315.95Factory pistons wear down under sustained high RPM and boost conditions, compromising ring seal and cylinder pressure—exactly when you can't afford failure. The VERTEX Piston Kit 23404A delivers the durability and precision you need for consistent power...09101963- SKU:
- 09101963
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +3,00 MM
- DISPLACEMENT:
- 480 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- PISTON DIAMETER METRIC:
- 97.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE METRIC:
- +3.00 MM
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit 22567A
VERTEX
$262.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit 22567A delivers the precision engineering and durable construction that serious racers and builders demand,...09101902- SKU:
- 09101902
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
$262.95 -
VERTEX Piston Kit - Standard 22926B
VERTEX
$230.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 22926B delivers the durability you need for consistent power delivery across extended racing sessions or demanding street applications. The advanced...09100993- SKU:
- 09100993
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$230.95Qty in Cart: 0Quantity:Price:$230.95Subtotal: -
VERTEX Piston Kit 24188C
VERTEX
$148.45Whether you're rebuilding a tired engine or pushing your racer to the next level, piston quality directly determines your engine's reliability and performance envelope. The VERTEX Piston Kit 24188C delivers forged 2618 aluminum construction with factory...09104664- SKU:
- 09104664
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 95.98 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$148.45Qty in Cart: 0Quantity:Price:$148.45Subtotal: -
VERTEX Piston Kit 24268A
VERTEX
$236.95The VERTEX Piston Kit 24268A delivers the reliability and performance precision you need for consistent top-end durability, whether you're rebuilding after wear or upgrading for increased displacement and power. Built with forged 2618 aluminum and...09105178- SKU:
- 09105178
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 250 CC
$236.95Qty in Cart: 0Quantity:Price:$236.95Subtotal: -
VERTEX Piston Kit 24270A
VERTEX
$254.95The VERTEX Piston Kit 24270A delivers the durability and precision you need to maximize engine performance and reliability, whether you're rebuilding a stock engine or pushing the limits on the track. Built with advanced materials and heat-treatment...09105191- SKU:
- 09105191
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$254.95Qty in Cart: 0Quantity:Price:$254.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23113A
VERTEX
$307.95Precision piston design directly impacts engine reliability, combustion efficiency, and peak horsepower delivery—especially in high-compression build scenarios where margin for error is zero. The VERTEX Piston Kit VTKTC23113A delivers the thermal...09103736- SKU:
- 09103736
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
VERTEX Piston Kit VTKTC23235A
VERTEX
$325.95High-performance pistons are the foundation of reliable engine output, especially under sustained boost and high RPM conditions. The VERTEX Piston Kit VTKTC23235A delivers precision-engineered pistons with proprietary surface treatments that reduce...09103742- SKU:
- 09103742
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$325.95Qty in Cart: 0Quantity:Price:$325.95Subtotal: -
VERTEX Piston Kit 23737C
VERTEX
$151.53A piston kit is the heartbeat of your engine's power delivery—and the VERTEX 23737C is engineered for builders who refuse to compromise on durability or performance. This kit combines precision manufacturing with proven metallurgy to deliver consistent...09102619- SKU:
- 09102619
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- PISTON DIAMETER METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$151.53Qty in Cart: 0Quantity:Price:$151.53Subtotal: -
On Sale
Wiseco 2-Stroke Piston Kit 58mm Standard Bore for 2016-2017 KTM 150 SX RE909M05800
WISECO
MSRP: $221.95Now: $174.00Was: $221.95The Wiseco 2-Stroke Piston Kit is engineered to maximize performance and reliability in your 2016-2017 KTM 150 SX, delivering the precision fitment and durability that competitive and recreational riders demand. Built with forged 2000 Series alloy and...09105103- SKU:
- 09105103
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- BORE SIZE METRIC:
- 58.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX100 1998-2013 PK1154
WISECO
MSRP: $192.95Now: $149.00Was: $192.95Wiseco's forged piston kits deliver the durability and precision needed for competitive KX100 racing and high-performance riding. If you're serious about engine reliability at peak RPMs, this complete top-end kit eliminates the guesswork of sourcing...09030310- SKU:
- 09030310
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 52.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 52.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.80 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $192.95Now: $149.00Was: $192.95 -
Wiseco Piston Kit with Gasket for Yamaha YZ250F 2012-2013 PK1902
WISECO
$309.95A piston kit is the foundation of reliable top-end performance, and the Wiseco PK1902 delivers the durability required for sustained high-RPM operation on your YZ250F. This complete kit eliminates guesswork by pairing a forged piston with matched rings,...09031146- SKU:
- 09031146
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$309.95Qty in Cart: 0Quantity:Price:$309.95Subtotal: -
Wiseco Piston Kit Standard Yamaha YZ250 1992-1998 736M06800
WISECO
$199.95The YZ250's two-stroke engine demands a piston that can handle extreme combustion pressures and rapid cycling without sacrificing responsiveness. Wiseco's precision-engineered piston kit restores—or exceeds—OEM performance while maintaining the...09101233- SKU:
- 09101233
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246,8 CC
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 68.00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.00 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 45mm Oversize for Kawasaki KX65 2000-2021 752M04500
WISECO
$119.95When you're running a KX65 at the edge of performance, stock pistons become your limiting factor. The Wiseco 752M04500 delivers the oversize displacement and reliability you need to unlock serious power gains while maintaining the durability required for...09101235- SKU:
- 09101235
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.60 MM
- DISPLACEMENT:
- 64 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit with Gaskets for Yamaha YZ250 1995-1998 PK1567
WISECO
$280.95If you're running a YZ250 at the limit, a worn top-end will cost you power, reliability, and race results. The Wiseco Piston Kit PK1567 delivers a complete engine refresh with forged-aluminum construction that handles sustained high RPMs and thermal...09030720- SKU:
- 09030720
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- STROKE LENGTH METRIC:
- 68.00 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 68.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 67.96 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246.8 CC
- PRODUCT NAME:
- REBUILD KIT
$280.95Qty in Cart: 0Quantity:Price:$280.95Subtotal: -
Wiseco Piston Kit Standard Bore 96mm 12:1 Compression Honda CRF450R 2002-2008 4820M09600
WISECO
$232.95Factory pistons wear down, and a degraded top-end robs your CRF450R of responsiveness and reliability. The Wiseco Piston Kit restores lost compression and throttle response while delivering the durability needed for aggressive trail work or race...09100334- SKU:
- 09100334
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- STROKE LENGTH METRIC:
- 62.10 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$232.95 -
Wiseco Piston Kit 102.40mm 9:1 Compression Honda XR650L 1993-2020 4562M10241
WISECO
$296.95If you're running an XR650L and want measurable gains in displacement and compression efficiency, a properly sized piston kit is fundamental to that upgrade. The Wiseco 102.40mm piston gives you a +2.40mm bore increase that translates directly to...09100338- SKU:
- 09100338
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 675 CC
- PISTON MATERIAL:
- FORGED
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +2.40 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE - OVERSIZE:
- +2,40 MM
- BORE SIZE METRIC:
- 102.40 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$296.95
