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 VTK23430CD
VERTEX
$137.95A quality piston kit is the foundation of reliable high-rpm performance, and the VERTEX VTK23430CD delivers the durability and precision demanded by serious racers and build enthusiasts. The T-5 heat treatment and molybdenum disulfide coating work...09103118- SKU:
- 09103118
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- TOP END PISTON KIT
$137.95 -
VERTEX Piston Kit VTK22998B
VERTEX
$223.95Maximum piston durability and reliable performance depend on heat treatment and surface protection—two areas where VERTEX VTK22998B excels. The T-5 hardening and tempering cycle ensures your pistons withstand extreme combustion pressures and temperature...09103120- SKU:
- 09103120
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$223.95 -
VERTEX Piston Kit VTK22854B-1
VERTEX
$262.95When you're pushing your engine to the limit, stock pistons simply won't cut it. The VERTEX Piston Kit VTK22854B-1 delivers the durability and precision engineering needed for sustained high-performance operation, with advanced heat-treatment and...09103121- SKU:
- 09103121
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$262.95Qty in Cart: 0Quantity:Price:$262.95Subtotal: -
VERTEX Piston Kit VTK22854B
VERTEX
$262.95OEM pistons wear out—VERTEX pistons are engineered to last. The VTK22854B kit delivers the durability and precision fit your engine demands, with advanced coatings and heat treatment that reduce friction during break-in and extend service life. Whether...09103122- SKU:
- 09103122
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- 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
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
$262.95 -
VERTEX Piston Kit 23614050
VERTEX
$170.95Engine reliability and performance depend on precision-engineered pistons that can withstand extreme combustion pressures while maintaining tight tolerances. The VERTEX Piston Kit 23614050 delivers the durability and strength required for both stock...09102050- SKU:
- 09102050
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 100 CC
- 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
- PISTON DIAMETER METRIC:
- 52.95 MM
$170.95 -
VERTEX Piston Kit 23614200
VERTEX
$177.95Whether you're rebuilding a two-stroke for peak performance or upgrading your four-stroke engine, the VERTEX Piston Kit 23614200 delivers the precision engineering and durability you need to maximize power and reliability. VERTEX pistons are heat-treated...09102051- SKU:
- 09102051
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 107 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.50 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST BIG BORE
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
VERTEX Piston Kit 23621200
VERTEX
$188.95A quality piston kit is fundamental to engine reliability and performance—especially under high RPM and forced induction scenarios. The VERTEX Piston Kit 23621200 delivers OEM-grade construction with durability enhancements that reduce wear during...09102054- SKU:
- 09102054
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 100 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.50 MM
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$188.95 -
VERTEX Piston Kit 23646B
VERTEX
$256.95Whether you're rebuilding after a complete teardown or upgrading to forged internals for higher compression, the VERTEX Piston Kit 23646B delivers the durability and precision you need to push your engine harder. The molybdenum disulfide-coated skirts...09102056- SKU:
- 09102056
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
$256.95 -
VERTEX Piston Kit - Standard 22863B
VERTEX
$116.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX 22863B delivers the durability demanded by serious racers and rebuild specialists. The T-5 heat treatment cycle ensures superior hardness and fatigue...09101024- SKU:
- 09101024
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- PISTON DIAMETER METRIC:
- 47.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$116.95 -
VERTEX Piston Kit - Standard 22189B
VERTEX
$158.95The VERTEX Piston Kit 22189B is engineered for builders who demand precision and longevity in high-demand engines. Heat-treated to exacting standards and coated with advanced molybdenum disulfide, these pistons accelerate break-in while maximizing ring...09101027- SKU:
- 09101027
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$158.95 -
VERTEX Piston Kit - Standard 22685C
VERTEX
$164.95A piston kit is one of the most critical investments you can make for engine reliability and longevity. The VERTEX Piston Kit 22685C delivers the durability and precision needed for high-performance builds, whether you're pushing power on the track or...09101028- SKU:
- 09101028
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$164.95 -
VERTEX Piston Kit - Standard 22581B
VERTEX
$235.95A piston kit is the heart of your engine's combustion process, and choosing the right one directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 22581B delivers the durability and precision you need for consistent power...09101033- SKU:
- 09101033
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit - Standard 23133B
VERTEX
$208.95The VERTEX Piston Kit 23133B delivers the durability and precision your engine demands during high-stress operation. Purpose-built with advanced heat treatment and low-friction coatings, these pistons minimize wear during break-in while maintaining...09101035- SKU:
- 09101035
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$208.95 -
VERTEX Piston Kit - Standard 22447
VERTEX
$242.95Precision-engineered pistons are the backbone of reliable high-RPM performance, and the VERTEX Standard 22447 delivers the durability needed for both street and track applications. The advanced heat-treatment process and specialized coating reduce...09101036- SKU:
- 09101036
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 500 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON DIAMETER METRIC:
- 88.95 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 89.00 MM
- STYLE:
- CAST REPLICA
$242.95 -
VERTEX Piston Kit 22860B
VERTEX
$131.95The VERTEX Piston Kit 22860B delivers the durability and precision you need to maximize engine performance and reliability under extreme conditions. Whether you're rebuilding after hard use or upgrading for increased displacement and power, this kit...09101048- SKU:
- 09101048
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 65 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 44.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$131.95 -
VERTEX Piston Kit - Standard 22803B
VERTEX
$131.95VERTEX pistons are engineered for maximum durability and reliability in high-demand racing and performance applications. The T-5 heat treatment process ensures superior hardness and fatigue resistance under extreme combustion pressures and thermal...09101051- SKU:
- 09101051
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CYLINDER DIAMETER METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.45 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
VERTEX Piston Kit 23621A
VERTEX
$208.95Whether you're rebuilding a worn top-end or upgrading to higher compression, the VERTEX Piston Kit 23621A delivers the durability and performance you need to maximize power and reliability. Built with precision heat treatment and a molybdenum disulfide...09103395- SKU:
- 09103395
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- PISTON DIAMETER METRIC:
- 52.44 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$208.95 -
VERTEX Piston Kit 23958A
VERTEX
$274.95A piston kit is only as reliable as its material composition and heat treatment—and the VERTEX 23958A delivers both in spades. If you're building an engine that needs to withstand sustained high RPM loads without sacrificing ring seal or longevity, this...09103396- SKU:
- 09103396
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$274.95 -
VERTEX Piston Kit 23958B
VERTEX
$262.95The VERTEX Piston Kit 23958B delivers the durability and precision required for sustained high-RPM performance. Whether you're pushing limits on the track or maximizing street power, these pistons are engineered to handle extreme combustion pressures...09103397- SKU:
- 09103397
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$262.95 -
VERTEX Piston Kit 23961B
VERTEX
$242.95A quality piston kit is the foundation of reliable high-RPM performance, and the VERTEX 23961B delivers the durability and precision your engine demands. Built with heat-treated forgings and a factory-applied Molybdenum Disulfide coating, these pistons...09103406- SKU:
- 09103406
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
$242.95Qty in Cart: 0Quantity:Price:$242.95Subtotal:
