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 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...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...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...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
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
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...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...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...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...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...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...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...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...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...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...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...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,...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...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...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...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 -
VERTEX Piston Kit - Standard 22649B
VERTEX
$207.95High-quality pistons are critical to maintaining ring seal integrity and consistent compression across the power stroke—especially in high-rpm or forced-induction applications. The VERTEX Piston Kit...09100996- SKU:
- 09100996
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
$207.95Qty in Cart: 0Quantity:Price:$207.95Subtotal: -
VERTEX Piston Kit - Standard 22909B
VERTEX
$223.95If you're building or rebuilding an engine that demands reliability under sustained high RPM and boost conditions, quality pistons are non-negotiable. The VERTEX Piston Kit 22909B delivers the...09100998- SKU:
- 09100998
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- 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
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$223.95
