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 VTK22860B
VERTEX
$184.95The VERTEX Piston Kit VTK22860B delivers the precision and durability required for high-RPM engine builds. Purpose-engineered with heat-treated construction and a molybdenum disulfide coating, these pistons minimize friction during critical break-in...09103081- SKU:
- 09103081
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 44.50 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 65 CC
- PISTON DIAMETER METRIC:
- 44.45 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$184.95 -
VERTEX Piston Kit VTK22803B
VERTEX
$184.95A quality piston kit is fundamental to engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit VTK22803B combines precision engineering with proven durability treatments that reduce friction and extend...09103082- SKU:
- 09103082
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 48.45 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 48.50 MM
$184.95 -
VERTEX Piston Kit VTK22991A
VERTEX
$217.95If you're building or rebuilding an engine that demands reliability under extreme conditions, piston quality directly impacts your engine's longevity and performance ceiling. The VERTEX Piston Kit VTK22991A delivers precision-engineered pistons with...09103083- SKU:
- 09103083
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- CYLINDER DIAMETER METRIC:
- 52.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- DISPLACEMENT:
- 105 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 51.95 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$217.95 -
VERTEX Piston Kit VTK23383A
VERTEX
$256.95Precision-engineered pistons are fundamental to engine longevity and consistent performance under high RPM conditions. The VERTEX Piston Kit VTK23383A delivers superior durability through advanced metallurgy and surface treatment, reducing wear rates and...09103087- SKU:
- 09103087
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$256.95 -
VERTEX Piston Kit VTK23383B
VERTEX
$256.95A quality piston kit is the foundation of engine reliability and peak performance. The VERTEX Piston Kit VTK23383B delivers precision-engineered pistons built to handle sustained high RPM operation with minimal wear, thanks to advanced metallurgy and...09103088- SKU:
- 09103088
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.96 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$256.95 -
VERTEX Piston Kit VTK22926B-1
VERTEX
$274.95Whether you're building a high-revving engine or restoring a performance classic, piston quality directly impacts reliability and longevity under extreme conditions. The VERTEX Piston Kit VTK22926B-1 delivers precision engineering with advanced...09103089- SKU:
- 09103089
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 200 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$274.95 -
VERTEX Piston Kit VTK22926B
VERTEX
$262.95Maximize engine longevity and reliable performance with the VERTEX Piston Kit VTK22926B, engineered for demanding applications where precision and durability are non-negotiable. The proprietary T-5 heat treatment cycle and molybdenum disulphide coating...09103090- SKU:
- 09103090
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 63.95 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 200 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
$262.95 -
VERTEX Piston Kit VTK22926C-1
VERTEX
$262.95A piston kit lives at the heart of your engine's power delivery—it's where combustion becomes motion. The VERTEX Piston Kit VTK22926C-1 is engineered for builders and racers who demand reliability under extreme conditions, combining advanced heat...09103091- SKU:
- 09103091
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.96 MM
- PRODUCT NAME:
- TOP END PISTON KIT
$262.95 -
VERTEX Piston Kit VTK22650B-2
VERTEX
$256.95A high-performance piston kit must handle extreme combustion pressures and thermal cycling without compromise. The VERTEX VTK22650B-2 delivers the durability and precision required for sustained power output, whether you're pushing for competition or...09103093- SKU:
- 09103093
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- TOP END PISTON KIT
$256.95 -
VERTEX Piston Kit VTK22650B
VERTEX
$256.95VERTEX pistons are engineered for engines that demand reliability under extreme conditions. Whether you're pushing peak boost on a forced-induction build or maximizing compression in a naturally aspirated platform, these pistons deliver the strength and...09103095- SKU:
- 09103095
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit VTK23630A-1
VERTEX
$268.95Building a high-revving engine demands pistons that can withstand extreme combustion pressures and sustained thermal stress without sacrificing reliability. The VERTEX Piston Kit VTK23630A-1 delivers precision-engineered internals with proven durability...09103096- SKU:
- 09103096
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.34 MM
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$268.95Qty in Cart: 0Quantity:Price:$268.95Subtotal: -
VERTEX Piston Kit VTK23630B-1
VERTEX
$268.95The VERTEX Piston Kit VTK23630B-1 delivers the durability and precision your engine demands, whether you're pushing limits on the track or building a high-output street platform. Heat-treated and coated with advanced materials, these pistons are...09103098- SKU:
- 09103098
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$268.95 -
VERTEX Piston Kit VTK23375B-2
VERTEX
$295.95Precision pistons are the foundation of reliable high-RPM performance, and the VERTEX VTK23375B-2 delivers the durability demanded by serious racers and rebuild enthusiasts. Built with advanced metallurgy and wear-resistant coatings, these pistons reduce...09103106- SKU:
- 09103106
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.95 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- STREET
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$295.95 -
VERTEX Piston Kit VTK23375B-1
VERTEX
$302.95A quality piston kit is the foundation of engine reliability and performance—especially under high boost or sustained RPM conditions. The VERTEX Piston Kit VTK23375B-1 delivers the durability and precision your engine demands, with factory-grade heat...09103107- SKU:
- 09103107
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON DIAMETER METRIC:
- 71.95 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- DISPLACEMENT:
- 300 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
$302.95 -
VERTEX Piston Kit VTK22877B
VERTEX
$164.95VERTEX pistons are engineered for builders who demand reliability under extreme combustion pressures and sustained high RPM operation. The T-5 heat treatment process ensures superior hardness and fatigue resistance, while the molybdenum disulfide skirt...09103123- SKU:
- 09103123
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
$164.95 -
VERTEX Piston Kit VTK23119B
VERTEX
$201.95Precision-engineered pistons are the foundation of engine reliability and performance—especially in high-demand racing and forced-induction applications. The VERTEX Piston Kit VTK23119B delivers the durability and thermal stability required for sustained...09103133- SKU:
- 09103133
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- TOP END PISTON KIT
$201.95 -
VERTEX Piston Kit 22501B
VERTEX
$137.95Whether you're rebuilding after hard track miles or upgrading to higher compression, the VERTEX Piston Kit 22501B delivers the precision engineering and material science you need for reliable, repeatable power. VERTEX's forged 2618 aluminum construction...09102075- SKU:
- 09102075
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- DISPLACEMENT:
- 80 CC
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.44 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$137.95 -
VERTEX Piston Kit 22983A
VERTEX
$242.95Engine durability and longevity depend on piston quality, and the VERTEX Piston Kit 22983A delivers the metallurgical precision required for high-stress racing and performance applications. The advanced heat treatment and specialized skirt coating...09101747- SKU:
- 09101747
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$242.95 -
VERTEX Piston Kit 23430CD
VERTEX
$104.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit 23430CD delivers the durability and heat resistance required for sustained racing demands. The advanced T-5 heat treatment process ensures...09101835- SKU:
- 09101835
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$104.95 -
VERTEX Piston Kit 22459B
VERTEX
$218.95A quality piston kit is fundamental to engine longevity and reliable performance under load. The VERTEX Piston Kit 22459B delivers precision engineering with heat-treated construction and a specialized skirt coating designed to reduce friction during...09100995- SKU:
- 09100995
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- CYLINDER DIAMETER METRIC:
- 67.50 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON DIAMETER METRIC:
- 67.45 MM
$218.95
