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 with Gaskets VTK22499B
VERTEX
$134.95A quality piston kit is the foundation of engine reliability and performance—undersized or worn pistons compromise compression, increase blowby, and rob you of power across the entire RPM range. The VERTEX VTK22499B delivers OEM-level durability with...09103359- SKU:
- 09103359
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 80 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
VERTEX Piston Kit with Gaskets VTK22499B-1
VERTEX
$164.95High-compression forged pistons are essential for unlocking consistent power gains across your entire RPM range while maintaining the durability needed for sustained racing or spirited driving. The VERTEX VTK22499B-1 kit combines precision engineering...09103360- SKU:
- 09103360
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 80 CC
- PISTON DIAMETER METRIC:
- 46.95 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$164.95 -
VERTEX Piston Kit with Gaskets VTK22795B-1
VERTEX
$289.95If you're serious about extracting maximum power and reliability from your engine, forged high-compression pistons are non-negotiable. The VERTEX Piston Kit delivers improved power and torque across your entire RPM range while the advanced Molybdenum...09103361- SKU:
- 09103361
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit VTK22685C-1
VERTEX
$189.95Precision-engineered pistons are the foundation of reliable high-rpm performance, and the VERTEX Piston Kit VTK22685C-1 delivers the durability demanded by serious racers and high-output builds. The advanced T-5 heat treatment cycle ensures consistent...09103018- SKU:
- 09103018
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$189.95 -
VERTEX Piston Kit VTK22685C
VERTEX
$189.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit VTK22685C delivers precision-engineered pistons built to withstand extreme duty while maintaining optimal...09103019- SKU:
- 09103019
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$189.95 -
VERTEX Piston Kit VTK23140C
VERTEX
$189.95The VERTEX Piston Kit VTK23140C delivers the precision engineering and durability required for high-performance engine builds. Whether you're pushing power limits on the track or rebuilding for reliability, these pistons are engineered to handle...09103021- SKU:
- 09103021
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
VERTEX Piston Kit VTK22581B
VERTEX
$274.95The VERTEX Piston Kit VTK22581B delivers the durability and precision required for sustained high-RPM performance, whether you're building a competition engine or upgrading a street application. Purpose-engineered with metallurgical treatments that...09103022- SKU:
- 09103022
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$274.95 -
VERTEX Piston Kit VTK22809B
VERTEX
$235.95Purpose-built for engines demanding precision and longevity, the VERTEX Piston Kit VTK22809B delivers the durability and performance characteristics required for competitive racing and high-output applications. The advanced heat-treatment process and...09103023- SKU:
- 09103023
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$235.95 -
VERTEX Piston Kit VTK23133B
VERTEX
$235.95Building a high-performance engine demands pistons engineered to handle extreme combustion pressures and sustained RPM loads without premature wear. The VERTEX Piston Kit VTK23133B delivers the durability and reliability you need for serious track...09103024- SKU:
- 09103024
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit VTK22863B
VERTEX
$150.95If you're building an engine that demands reliability under sustained high RPM and boost, piston durability isn't negotiable. The VERTEX Piston Kit VTK22863B delivers the metallurgical foundation and surface engineering that separates race-proven...09103028- SKU:
- 09103028
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$150.95 -
VERTEX Piston Kit 23666A
VERTEX
$137.95The VERTEX Piston Kit 23666A delivers the reliability and performance you need for sustained high-RPM operation. Whether you're rebuilding after a failure or upgrading for increased displacement and power, VERTEX pistons are engineered to withstand...09105949- SKU:
- 09105949
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 48 MM
- DISPLACEMENT:
- 85 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.87 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
$137.95 -
VERTEX Piston Kit 23666B
VERTEX
$123.95Whether you're rebuilding a two-stroke or refreshing a four-stroke engine, the VERTEX Piston Kit 23666B delivers the strength and precision required for reliable performance across demanding riding conditions. The combination of advanced material science...09105950- SKU:
- 09105950
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 47.88 MM
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 48 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
$123.95 -
VERTEX Piston Kit 23654B
VERTEX
$289.95Whether you're rebuilding a tired engine or pursuing peak performance, the VERTEX Piston Kit 23654B delivers the durability and precision required for demanding applications. These pistons combine advanced metallurgy with proven manufacturing techniques...09102060- SKU:
- 09102060
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE METRIC:
- +3.00 MM
- PISTON DIAMETER METRIC:
- 79.96 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit - Standard 22652B
VERTEX
$184.95Maximum power output demands pistons engineered for extreme conditions—the VERTEX Standard 22652B delivers the durability and precision required for serious racing and high-performance builds. Built with advanced heat treatment and specialized coatings,...09100945- SKU:
- 09100945
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.96 MM
$184.95 -
VERTEX Piston Kit 22998B
VERTEX
$184.95When you're pushing your engine to its limits, piston failure isn't an option—it's a catastrophe. The VERTEX Piston Kit 22998B delivers the durability and precision you need to maintain peak performance through extended high-rpm operation. With advanced...09100946- SKU:
- 09100946
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
VERTEX Piston Kit - Standard 22386B
VERTEX
$230.95Precision-engineered pistons are the foundation of reliable, high-output engine performance—and the VERTEX Piston Kit 22386B delivers the durability and consistency your build demands. Built with industry-leading heat treatment and a specialized skirt...09100948- SKU:
- 09100948
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- PISTON DIAMETER METRIC:
- 66.35 MM
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$230.95 -
VERTEX Piston Kit - Standard 22854B
VERTEX
$230.95Pistons are the hardworking heart of your engine, and their durability directly impacts reliability and longevity under sustained performance demands. The VERTEX Piston Kit 22854B delivers precision-engineered construction with heat-treated components...09100952- SKU:
- 09100952
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$230.95Qty in Cart: 0Quantity:Price:$230.95Subtotal: -
VERTEX Piston Kit 22982B
VERTEX
$256.95The VERTEX Piston Kit 22982B delivers the durability and precision your engine demands, whether you're pushing peak horsepower on the track or rebuilding after serious wear. Engineered with T-5 heat-treated aluminum and a molybdenum disulfide skirt...09100953- SKU:
- 09100953
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$256.95 -
VERTEX Piston Kit - Standard 22500A
VERTEX
$122.95Building a high-revving engine demands pistons engineered for extreme conditions. The VERTEX Piston Kit 22500A delivers the durability and precision needed to handle sustained boost, aggressive timing, and punishing cylinder pressures without compromise...09100960- SKU:
- 09100960
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 80 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
$122.95Qty in Cart: 0Quantity:Price:$122.95Subtotal: -
VERTEX Piston Kit - Standard 22441B
VERTEX
$148.95Building a high-revving engine demands pistons engineered for reliability under extreme conditions. The VERTEX Piston Kit 22441B delivers the durability and precision you need to maximize power output while maintaining structural integrity through...09100963- SKU:
- 09100963
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
$148.95
