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...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...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...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...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,...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...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 -
On Sale
VERTEX Piston Kit 24275A
VERTEX
MSRP: $353.95Now: $207.00Was: $353.95Whether 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...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
MSRP: $353.95Now: $207.00Was: $353.95 -
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...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...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
$327.95Qty in Cart: 0Quantity:Price:$327.95Subtotal: -
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...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...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...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...09105149- SKU:
- 09105149
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
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...09105150- SKU:
- 09105150
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 24023B
VERTEX
MSRP: $301.95Now: $193.00Was: $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...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
MSRP: $301.95Now: $193.00Was: $301.95Qty in Cart: 0Quantity:Price:MSRP: $301.95Now: $193.00Was: $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...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...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...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
$223.95Qty in Cart: 0Quantity:Price:$223.95Subtotal: -
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...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...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
