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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VERTEX Piston Kit 24188B
VERTEX
$294.95Piston failures don't just cost you a race—they cost you time, money, and credibility. The VERTEX Piston Kit 24188B delivers OEM-grade reliability with forged 2618 aluminum construction and...09104663- SKU:
- 09104663
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 95.97 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
On Sale
VERTEX Piston Kit 24189A
VERTEX
MSRP: $322.95Now: $207.00Was: $322.95Engine reliability hinges on piston quality—weak or worn pistons compromise compression, efficiency, and longevity across your entire power band. The VERTEX Piston Kit 24189A delivers OEM-level...09104666- SKU:
- 09104666
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- GP RACER'S CHOICE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON DIAMETER METRIC:
- 95.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
MSRP: $322.95Now: $207.00Was: $322.95 -
On Sale
VERTEX Piston Kit 24189B
VERTEX
MSRP: $322.95Now: $207.00Was: $322.95The VERTEX Piston Kit 24189B delivers the durability and performance precision your engine demands, whether you're chasing lap times or rebuilding after hard use. Forged from premium 2618 aluminum...09104667- SKU:
- 09104667
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $322.95Now: $207.00Was: $322.95Qty in Cart: 0Quantity:Price:MSRP: $322.95Now: $207.00Was: $322.95Subtotal: -
VERTEX Piston Kit 24267B
VERTEX
$256.95Whether you're rebuilding a tired top end or preparing for competition, piston quality directly impacts engine longevity, reliability, and peak performance. The VERTEX Piston Kit 24267B delivers...09105175- SKU:
- 09105175
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$256.95 -
VERTEX Piston Kit 24268B
VERTEX
$289.95The VERTEX Piston Kit 24268B delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding after serious performance driving. Each piston is engineered...09105179- SKU:
- 09105179
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
VERTEX Piston Kit 24233C
VERTEX
$188.95Whether you're rebuilding a tired engine or maximizing performance in a fresh build, the VERTEX Piston Kit 24233C delivers the precision engineering and durability required for consistent, reliable...09105185- SKU:
- 09105185
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- PISTON DIAMETER METRIC:
- 57.96 MM
- STYLE:
- CAST RACE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 144 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$188.95Qty in Cart: 0Quantity:Price:$188.95Subtotal: -
VERTEX Piston Kit 24142A
VERTEX
$327.95The VERTEX Piston Kit 24142A delivers the durability and precision needed for sustained high-RPM performance, whether you're rebuilding a stock engine or pushing for peak power gains. With premium...09105186- SKU:
- 09105186
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON DIAMETER METRIC:
- 80.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- DISPLACEMENT:
- 270 CC
- STYLE:
- FORGED BIG BORE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$327.95 -
VERTEX Piston Kit 24270B
VERTEX
$274.95Whether you're rebuilding after a season of hard racing or upgrading to higher compression, the VERTEX Piston Kit 24270B delivers the durability and performance needed to handle extreme conditions...09105192- SKU:
- 09105192
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$274.95Qty in Cart: 0Quantity:Price:$274.95Subtotal: -
VERTEX Piston Kit - Stroker 23879A
VERTEX
$176.95If you're building a stroker engine that demands reliability under extreme combustion pressures, the VERTEX Piston Kit 23879A delivers the precision and durability required for sustained...09103677- SKU:
- 09103677
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST STROKER
- CYLINDER DIAMETER METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 51.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 112 CC
- UNITS:
- KIT
$176.95 -
VERTEX Piston Kit VTKTC22983B
VERTEX
$310.95OEM pistons often fail under sustained high-RPM load, leaving you stranded or facing catastrophic engine damage. The VERTEX Piston Kit VTKTC22983B delivers competition-grade durability through...09103725- SKU:
- 09103725
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
$310.95 -
VERTEX Piston Kit VTKTC23003B
VERTEX
$348.95When you're pushing your engine to the limit, your pistons need to withstand extreme heat and pressure without compromising reliability or longevity. The VERTEX Piston Kit VTKTC23003B delivers the...09103730- SKU:
- 09103730
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
$348.95Qty in Cart: 0Quantity:Price:$348.95Subtotal: -
VERTEX Piston Kit VTKTC23003B-1
VERTEX
$348.95If you're building or rebuilding an engine that demands reliability under extreme conditions, piston quality directly impacts your engine's longevity and power delivery. The VERTEX Piston Kit...09103731- SKU:
- 09103731
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
$348.95Qty in Cart: 0Quantity:Price:$348.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23113B
VERTEX
$341.95High-compression pistons are essential for maximizing power output in forced induction and high-revving naturally aspirated builds, and the VERTEX Piston Kit delivers the durability and precision...09103737- SKU:
- 09103737
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$341.95 -
VERTEX Piston Kit VTKTC23127A
VERTEX
$308.95A quality piston kit is the foundation of reliable, repeatable power in any high-performance engine build. The VERTEX Piston Kit VTKTC23127A delivers precision-engineered pistons built to withstand...09103739- SKU:
- 09103739
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$308.95Qty in Cart: 0Quantity:Price:$308.95Subtotal: -
VERTEX Piston Kit VTKTC23127B
VERTEX
$308.95A piston kit is the heart of engine reliability and performance—especially under high-boost or high-RPM conditions where factory components fall short. The VERTEX Piston Kit VTKTC23127B delivers the...09103740- SKU:
- 09103740
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$308.95Qty in Cart: 0Quantity:Price:$308.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23236B
VERTEX
$380.95Building a high-compression engine demands pistons engineered for sustained power delivery and reliability under extreme conditions. The VERTEX Piston Kit VTKTC23236B delivers the precision...09103746- SKU:
- 09103746
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$380.95Qty in Cart: 0Quantity:Price:$380.95Subtotal: -
VERTEX Piston Kit VTKTC23562B
VERTEX
$362.95A piston kit is fundamental to your engine's reliability and performance—it's the component that bears the brunt of combustion forces while maintaining precise tolerances with your cylinder walls...09103779- SKU:
- 09103779
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$362.95Qty in Cart: 0Quantity:Price:$362.95Subtotal: -
VERTEX Piston Kit VTKTC23564B
VERTEX
$315.95High-performance racing demands pistons engineered for extreme conditions—and the VERTEX Piston Kit VTKTC23564B delivers the durability and precision required for sustained boost, high RPM, and...09103785- SKU:
- 09103785
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
On Sale
VERTEX Piston Kit 23736B
VERTEX
MSRP: $290.95Now: $186.00Was: $290.95A quality piston kit is the foundation of any reliable high-performance engine build. The VERTEX Piston Kit 23736B delivers the durability and precision needed to withstand extreme combustion...09102615- SKU:
- 09102615
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 76.96 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
MSRP: $290.95Now: $186.00Was: $290.95Qty in Cart: 0Quantity:Price:MSRP: $290.95Now: $186.00Was: $290.95Subtotal: -
VERTEX Piston Kit 23342B
VERTEX
$302.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and sustained load. The VERTEX Piston Kit 23342B delivers the durability and precision fit your...09102626- SKU:
- 09102626
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal:
