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 factory-spec engineering, so you can focus on performance...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: -
VERTEX Piston Kit 24189A
VERTEX
$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 durability with forged 2618 aluminum construction and proven...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
$322.95 -
VERTEX Piston Kit 24189B
VERTEX
$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 and heat-treated through a rigorous T-5 cycle, these...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
$322.95Qty in Cart: 0Quantity:Price:$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 OEM-grade construction with heat-treated,...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 with advanced metallurgy and surface treatments to...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 power. VERTEX's forged and cast options let you choose...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 forged and cast options engineered for different...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. VERTEX's heat-treated forged and cast options give you...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 high-performance operation. These pistons are engineered with...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 advanced heat treatment and premium surface coatings,...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 durability and performance characteristics that...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 VTKTC23003B-1 delivers precision engineering with proprietary...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 required for sustained performance. The T-5 heat-treatment...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 extreme combustion pressures while maintaining tight...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 durability and precision you need for sustained power...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 metallurgy and surface treatments required to handle aggressive...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. The VERTEX Piston Kit VTKTC23562B delivers the durability...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 demanding track sessions. Every piston in this kit undergoes...09103785- SKU:
- 09103785
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit 23736B
VERTEX
$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 pressures while maintaining consistent ring seal and minimal...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
$290.95 -
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 build demands, with materials and heat treatment...09102626- SKU:
- 09102626
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal:
