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 - Standard 22520B
VERTEX
$171.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit 22520B delivers the durability and consistency your engine demands. Whether you're pushing peak horsepower on the track or maintaining...09100964- SKU:
- 09100964
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 125 CC
- STYLE:
- CAST REPLICA
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
VERTEX Piston Kit - Standard 23119B
VERTEX
$156.95Precision-engineered pistons are the foundation of reliable engine performance, especially under sustained high RPM and boost conditions. The VERTEX Piston Kit 23119B delivers the durability and consistency you need to maintain peak power delivery...09100966- SKU:
- 09100966
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 125 CC
- 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
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$156.95 -
VERTEX Piston Kit - Standard 22154B
VERTEX
$208.95Pistons are the engine's hardest-working components—they need to survive extreme combustion pressures, temperature swings, and constant acceleration cycles. The VERTEX Piston Kit 22154B delivers the metallurgical durability and surface treatment...09100968- SKU:
- 09100968
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 67.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$208.95Qty in Cart: 0Quantity:Price:$208.95Subtotal: -
VERTEX Piston Kit 22584B
VERTEX
$183.95The VERTEX Piston Kit 22584B delivers the reliability and performance precision you need for demanding engine builds. Whether you're upgrading displacement, increasing compression, or simply replacing worn components, this kit provides everything...09100970- SKU:
- 09100970
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$183.95 -
VERTEX Piston Kit 22805B
VERTEX
$256.95The VERTEX Piston Kit 22805B delivers the durability and precision your engine demands under extreme combustion pressures. Whether you're building a race engine or refreshing a high-mileage block, these pistons are engineered to handle sustained...09100971- SKU:
- 09100971
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
$256.95 -
VERTEX Piston Kit - Standard 22481CD
VERTEX
$106.95Piston durability and longevity directly impact engine reliability during sustained high-RPM operation. The VERTEX Piston Kit 22481CD delivers a proven combination of heat-treated construction and advanced surface coatings that reduce friction,...09100981- SKU:
- 09100981
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$106.95 -
VERTEX Piston Kit 24275A
VERTEX
$322.95Whether you're rebuilding a tired engine or pushing for peak performance, the VERTEX Piston Kit 24275A delivers the precision engineering and durability required for sustained high-RPM operation. These pistons combine advanced metallurgy with proven...09105131- SKU:
- 09105131
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CYLINDER DIAMETER METRIC:
- 79 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- PISTON DIAMETER METRIC:
- 78.96 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$322.95 -
VERTEX Piston Kit 24198B
VERTEX
$341.95A high-performance piston kit needs to survive extreme combustion pressures while maintaining reliable ring seal and minimal friction—the VERTEX Piston Kit 24198B delivers both. Whether you're rebuilding a stock engine or pushing high-compression limits,...09105135- SKU:
- 09105135
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 480 CC
- PISTON DIAMETER METRIC:
- 98.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED BIG BORE
$341.95Qty in Cart: 0Quantity:Price:$341.95Subtotal: -
VERTEX Piston Kit 24238A
VERTEX
$327.95Engine durability and performance depend on precision-engineered pistons that can withstand extreme combustion pressures and sustained RPM loads. The VERTEX Piston Kit 24238A delivers OEM-quality reliability with purposeful upgrades in material strength...09105137- SKU:
- 09105137
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- DISPLACEMENT:
- 366 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$327.95 -
VERTEX Piston Kit 24238B
VERTEX
$327.95The VERTEX Piston Kit 24238B delivers the durability and precision your engine demands, whether you're rebuilding after hard racing or seeking a reliable OEM replacement. Each piston undergoes rigorous T-5 heat treatment and is coated with molybdenum...09105138- SKU:
- 09105138
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- UNITS:
- KIT
- DISPLACEMENT:
- 366 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.97 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- STREET
- STYLE:
- FORGED BIG BORE
$327.95 -
VERTEX Piston Kit 24213A
VERTEX
$302.95The VERTEX Piston Kit 24213A delivers the durability and precision you need for high-RPM performance and extended engine life. Whether you're rebuilding after a failure or upgrading for increased displacement and power, this kit provides complete top-end...09105143- SKU:
- 09105143
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Kit 24213B
VERTEX
$302.95The VERTEX Piston Kit 24213B delivers the durability and precision you need to maximize engine performance and extend top-end life, whether you're running cast or forged internals. Built with heat-treated aluminum and advanced surface coatings, these...09105144- SKU:
- 09105144
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$302.95 -
VERTEX Piston Kit 24209A
VERTEX
$302.95Whether you're rebuilding a two-stroke or upgrading your four-stroke engine, piston quality directly impacts reliability, power delivery, and engine longevity. The VERTEX Piston Kit 24209A delivers OEM-matched or performance-enhanced options with...09105149- SKU:
- 09105149
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95 -
VERTEX Piston Kit 24209B
VERTEX
$302.95Whether you're rebuilding a two-stroke or refreshing a four-stroke engine, piston quality directly impacts durability, ring seal, and power output. The VERTEX Piston Kit 24209B delivers OEM-grade reliability with forged or cast options engineered for...09105150- SKU:
- 09105150
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Kit - High Compression 24023B
VERTEX
$301.95If you're building a high-compression engine that demands reliability under extreme load, the VERTEX Piston Kit 24023B delivers the precision and durability required for sustained performance. Each piston undergoes rigorous T-5 heat treatment to...09103694- SKU:
- 09103694
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 14.8:1
- UNITS:
- KIT
$301.95Qty in Cart: 0Quantity:Price:$301.95Subtotal: -
VERTEX Piston Kit 23757B
VERTEX
$289.95Whether you're rebuilding a tired engine or upgrading to a high-compression setup, the VERTEX Piston Kit 23757B delivers the precision engineering and durability required for demanding applications. These pistons are engineered to handle extended service...09103179- SKU:
- 09103179
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
$289.95 -
VERTEX Piston Kit 23761C
VERTEX
$294.95A quality piston kit is fundamental to engine longevity and reliability, especially under high-demand racing or boosted conditions. The VERTEX Piston Kit 23761C combines precision engineering with battle-tested material science to deliver consistent...09103186- SKU:
- 09103186
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
VERTEX Piston Kit 23249B
VERTEX
$223.95Piston durability directly impacts engine reliability and performance longevity. The VERTEX Piston Kit 23249B combines advanced heat-treatment metallurgy with factory-proven coatings to minimize wear during critical break-in periods and extend service...09102553- SKU:
- 09102553
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.34 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$223.95 -
VERTEX Piston Kit 23381A
VERTEX
$315.95The VERTEX Piston Kit 23381A delivers the precision and durability required for high-RPM applications and sustained power delivery. Purpose-built with advanced material treatments, these pistons are engineered to minimize wear during break-in while...09102557- SKU:
- 09102557
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit 23383B
VERTEX
$208.95Piston durability and break-in performance directly impact engine longevity and power delivery. The VERTEX Piston Kit 23383B combines advanced metallurgy with field-proven surface treatments to reduce friction during initial operation while maintaining...09102558- SKU:
- 09102558
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.96 MM
- STYLE:
- CAST REPLICA
$208.95
