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 24233A
VERTEX
$208.95Engine longevity and peak performance depend on piston quality—and VERTEX delivers both with forged and cast options engineered for your specific power goals. Whether you're chasing maximum displacement on a big bore or maximizing compression ratios,...09105753- SKU:
- 09105753
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST RACE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 57.94 MM
- PRODUCT NAME:
- PISTON KIT
$208.95 -
VERTEX Piston Kit 24233B
VERTEX
$217.95Whether you're rebuilding a two-stroke or refreshing a four-stroke top end, the VERTEX Piston Kit 24233B delivers the durability and precision needed to handle sustained high-RPM operation. Factory-quality construction with premium materials means...09105754- SKU:
- 09105754
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST RACE
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- PISTON DIAMETER METRIC:
- 57.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- CAST
$217.95 -
VERTEX Piston Kit 24187A
VERTEX
$274.95Whether you're rebuilding a tired engine or stepping up compression for serious power gains, the VERTEX Piston Kit 24187A delivers the durability and performance you need to keep running hard. These forged pistons are engineered to handle sustained...09104658- SKU:
- 09104658
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$274.95 -
VERTEX Piston Kit 24187B
VERTEX
$262.95Whether you're rebuilding a tired engine or upgrading to higher compression ratios, the VERTEX Piston Kit 24187B delivers the strength and reliability that separates quality machine work from corner-cutting. Forged 2618 aluminum construction combined...09104659- SKU:
- 09104659
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$262.95 -
VERTEX Piston Kit 24211A
VERTEX
$327.95The VERTEX Piston Kit 24211A delivers the durability and precision your engine demands, whether you're rebuilding a stock top-end or pushing peak performance. With forged 2618 aluminum construction and molybdenum-coated skirts, these pistons accelerate...09105152- SKU:
- 09105152
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PISTON DIAMETER METRIC:
- 94.95 MM
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$327.95Qty in Cart: 0Quantity:Price:$327.95Subtotal: -
VERTEX Piston Kit 23928A
VERTEX
$189.95A quality piston kit is the foundation of reliable engine performance, directly impacting power delivery, longevity, and break-in characteristics. The VERTEX Piston Kit 23928A delivers precision-engineered pistons with proven heat treatment and coating...09105155- SKU:
- 09105155
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
$189.95 -
VERTEX Piston Kit 23928B
VERTEX
$189.95The VERTEX Piston Kit 23928B delivers the durability and precision needed for sustained high-RPM performance, whether you're rebuilding a worn top end or upgrading to higher compression. Built with meticulous heat treatment and advanced surface coatings,...09105156- SKU:
- 09105156
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
$189.95 -
VERTEX Piston Kit 23928C
VERTEX
$176.95Whether you're rebuilding a high-mileage engine or stepping up compression for more power, the VERTEX Piston Kit 23928C delivers the precision and durability you need to make reliable horsepower. These pistons are engineered for consistent performance...09105157- SKU:
- 09105157
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- CAST
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$176.95 -
VERTEX Piston Kit 24243A
VERTEX
$171.95The VERTEX Piston Kit 24243A delivers the durability and precision your engine demands, whether you're rebuilding a worn-out top end or upgrading for performance. Heat-treated and coated with molybdenum disulfide, these pistons accelerate break-in while...09105159- SKU:
- 09105159
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST RACE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 53.94 MM
$171.95 -
VERTEX Piston Kit 24097B
VERTEX
$302.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX 24097B delivers the durability and precision required for sustained high-RPM operation. The advanced heat treatment and low-friction coatings reduce break-in wear while...09104077- SKU:
- 09104077
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$302.95 -
VERTEX Piston Kit 24098B
VERTEX
$293.95Whether you're rebuilding after catastrophic failure or optimizing an existing engine, the VERTEX Piston Kit 24098B delivers the precision and durability required for sustained high-RPM performance. These pistons are engineered to withstand extreme...09104111- SKU:
- 09104111
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$293.95 -
VERTEX Piston Kit VTKTC23259A
VERTEX
$314.95Whether you're building a high-output engine or refreshing a time-worn bottom end, piston quality directly impacts reliability, longevity, and power delivery. The VERTEX Piston Kit VTKTC23259A delivers precision engineering with advanced material...09103749- SKU:
- 09103749
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
$314.95Qty in Cart: 0Quantity:Price:$314.95Subtotal: -
VERTEX Piston Kit VTKTC23259A-1
VERTEX
$282.95A piston kit is the foundation of your engine's reliability and performance—and VERTEX delivers the precision engineering needed for sustained high-RPM duty. This kit combines advanced heat treatment with a specialized anti-friction coating to minimize...09103750- SKU:
- 09103750
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$282.95 -
VERTEX Piston Kit VTKTC23259B-1
VERTEX
$314.95Proper piston selection is critical to engine longevity and peak performance under sustained load. The VERTEX Piston Kit VTKTC23259B-1 delivers the durability and precision your build demands, with heat treatment and low-friction coatings engineered to...09103752- SKU:
- 09103752
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
$314.95 -
VERTEX Piston Kit VTKTC23311A
VERTEX
$302.95A quality piston kit is fundamental to engine reliability and performance—especially under high-load conditions where factory components fall short. The VERTEX Piston Kit VTKTC23311A delivers precision engineering and proven durability through advanced...09103754- SKU:
- 09103754
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
$302.95 -
VERTEX Piston Kit VTKTC23391A
VERTEX
$308.95Building a high-performance engine demands pistons engineered for extreme conditions—and the VERTEX Piston Kit VTKTC23391A delivers exactly that. These pistons combine precision heat treatment with advanced surface coatings to withstand peak combustion...09103757- SKU:
- 09103757
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$308.95 -
VERTEX Piston Kit VTKTC23391B
VERTEX
$302.95Precision piston performance demands components engineered for durability under extreme conditions. The VERTEX Piston Kit VTKTC23391B delivers heat-treated construction and specialized surface coatings designed to extend piston life while reducing...09103758- SKU:
- 09103758
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$302.95 -
VERTEX Piston Kit VTKTC23443A
VERTEX
$321.95When you're pushing your engine to the limit, piston durability becomes non-negotiable. The VERTEX Piston Kit VTKTC23443A delivers the precision engineering and material science required to handle extreme combustion pressures while maintaining...09103760- SKU:
- 09103760
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$321.95 -
VERTEX Piston Kit VTKTC23510A
VERTEX
$321.95Quality pistons are the foundation of reliable engine performance, especially when you're pushing your build to its limits. The VERTEX Piston Kit VTKTC23510A delivers the durability and precision needed for sustained high-RPM operation, whether you're on...09103769- SKU:
- 09103769
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
$321.95 -
VERTEX Piston Kit VTKTC23510B
VERTEX
$321.95A piston kit is the foundation of reliable engine performance, directly impacting compression, combustion efficiency, and overall durability under sustained load. The VERTEX Piston Kit VTKTC23510B delivers precision engineering with advanced material...09103770- SKU:
- 09103770
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$321.95Qty in Cart: 0Quantity:Price:$321.95Subtotal:
