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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Wiseco Piston Kit 75.50mm 10.5:1 Compression Ratio for Honda XR250R 1986-2004 4466M07550
WISECO
$219.95The Wiseco 4466M07550 is engineered to restore or upgrade your XR250R's top-end with a precisely machined piston that maximizes combustion efficiency and power delivery. The 10.5:1 compression ratio extracts measurably more horsepower and torque from...09100753- SKU:
- 09100753
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 75.50 MM
- DISPLACEMENT:
- 250 CC
- BORE - OVERSIZE METRIC:
- +2.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- UNITS:
- EACH
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal: -
Wiseco Piston Kit Yamaha RT100 1990-2000 52.00mm 771M05200
WISECO
$132.95A worn or damaged piston directly impacts your RT100's power delivery, fuel efficiency, and engine longevity. The Wiseco 771M05200 restores lost compression and combustion efficiency with precision-engineered, forged-aluminum construction designed...09100795- SKU:
- 09100795
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 97 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.60 MM
- PISTON MATERIAL:
- FORGED
$132.95 -
Wiseco Yamaha RT100 1990-2000 Piston Kit 52.50mm 771M05250
WISECO
$132.95If your Yamaha RT100 is wearing its original piston, you're leaving performance on the table. The Wiseco 771M05250 replaces worn or damaged pistons with precision-engineered components that restore throttle response, improve power delivery, and extend...09100796- SKU:
- 09100796
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 99 CC
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- STROKE LENGTH METRIC:
- 45.60 MM
$132.95 -
Wiseco Piston Kit Yamaha RT100 1990-2000 53mm Bore 771M05300
WISECO
$132.95When your 2-stroke demands reliability under sustained high-RPM load, a quality piston kit separates weekend warriors from serious competitors. The Wiseco 771M05300 delivers aerospace-grade forged aluminum construction with CNC precision, ensuring your...09100797- SKU:
- 09100797
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- DISPLACEMENT:
- 101,00 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.60 MM
$132.95 -
Wiseco Piston Kit Standard Bore 54mm Yamaha YZ125 2005-2021 846M05400
WISECO
$174.95When your YZ125's original piston starts showing wear, power delivery suffers and reliability becomes a gamble. The Wiseco 846M05400 replaces it with aerospace-grade forged aluminum and precision coatings that restore—or exceed—factory performance while...09100799- SKU:
- 09100799
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit Standard Bore 77mm 12.5:1 Compression Yamaha YZ250F 2005-2007 4882M07700
WISECO
$174.95If you're running a YZ250F between 2005-2007, factory pistons won't cut it for sustained high-RPM performance or competitive riding. The Wiseco 4882M07700 delivers the compression ratio and material quality needed to maximize horsepower, improve throttle...09100808- SKU:
- 09100808
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$174.95 -
VERTEX Piston Kit - High Compression 24112B
VERTEX
$327.95High-compression pistons are essential for maximizing power output and fuel efficiency in performance engines, but only if they're built to withstand extreme combustion pressures without detonation or failure. The VERTEX Piston Kit 24112B combines...09104114- SKU:
- 09104114
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 94.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$327.95 -
VERTEX Piston Kit - High Compression 24116A
VERTEX
$296.95High-compression pistons are essential for extracting maximum power from a tuned or forced-induction engine without sacrificing reliability. The VERTEX 24116A delivers the strength and precision needed for sustained high-RPM performance, while its...09104117- SKU:
- 09104117
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 87.96 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 350 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$296.95Qty in Cart: 0Quantity:Price:$296.95Subtotal: -
VERTEX Piston Kit - High Compression 24113A
VERTEX
$367.95If you're building an engine that demands reliability under extreme combustion pressures, the VERTEX Piston Kit 24113A delivers the metallurgical precision required for sustained high-RPM performance. The T-5 heat treatment and molybdenum disulfide skirt...09104119- SKU:
- 09104119
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 13.3:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$367.95 -
VERTEX Piston Kit - High Compression 24113B
VERTEX
$367.95High-compression pistons demand precision engineering to handle extreme combustion pressures and thermal cycling without compromising durability or ring sealing. The VERTEX 24113B kit delivers race-proven construction with advanced surface treatments...09104120- SKU:
- 09104120
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 13.3:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PISTON DIAMETER METRIC:
- 94.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$367.95 -
VERTEX Piston Kit - High Compression 24121C
VERTEX
$265.95If you're building or rebuilding an engine that demands reliable high-compression performance, the VERTEX Piston Kit 24121C delivers the durability and precision required for sustained power output. These pistons are engineered for demanding applications...09104130- SKU:
- 09104130
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PISTON DIAMETER METRIC:
- 76.78 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$265.95Qty in Cart: 0Quantity:Price:$265.95Subtotal: -
VERTEX Piston Kit 24105C
VERTEX
$70.95A quality piston kit is the foundation of reliable engine performance—especially under sustained high RPM and load. The VERTEX Piston Kit 24105C delivers precision-engineered pistons with advanced surface treatments designed to minimize friction, extend...09104136- SKU:
- 09104136
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 38.96 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.95 -
VERTEX Piston Kit 24020A
VERTEX
$256.95Factory pistons wear out—and when they do, your engine's efficiency and reliability suffer. The VERTEX Piston Kit 24020A delivers OEM-quality construction with performance-grade durability, giving you the peace of mind that your engine will handle...09103684- SKU:
- 09103684
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit 24020B
VERTEX
$256.95The VERTEX Piston Kit 24020B delivers the precision engineering and material durability your engine demands during high-performance operation. Purpose-built with advanced metallurgy and surface treatments, these pistons reduce friction during critical...09103685- SKU:
- 09103685
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit 22224B
VERTEX
$148.95A quality piston kit is the foundation of any high-performing engine—it directly impacts combustion efficiency, horsepower delivery, and long-term reliability. The VERTEX Piston Kit 22224B combines precision engineering with proven durability features,...09102116- SKU:
- 09102116
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$148.95 -
VERTEX Piston Kit 22896B
VERTEX
$302.95Whether you're rebuilding a worn top end or upgrading to forged internals for higher compression and power, the VERTEX Piston Kit 22896B delivers the durability and precision demanded by serious racers and engine builders. Each piston is engineered with...09102120- SKU:
- 09102120
- Availability:
- Ships Same Business Day
- Weight:
- 1.09 LBS
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 94.94 MM
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$302.95 -
VERTEX Piston Kit 23614A
VERTEX
$197.95Whether you're rebuilding a worn top end or upgrading to higher compression, the VERTEX Piston Kit 23614A delivers the durability and precision needed for consistent performance across your entire RPM range. VERTEX pistons are engineered with premium...09104645- SKU:
- 09104645
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- DISPLACEMENT:
- 99 CC
- PISTON DIAMETER METRIC:
- 52.44 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
$197.95 -
VERTEX Piston Kit 23614B
VERTEX
$197.95The VERTEX Piston Kit 23614B delivers the durability and precision required for serious engine rebuilds and high-performance builds. Whether you're running cast or forged variants, each piston is engineered with advanced heat treatment and surface...09104646- SKU:
- 09104646
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 52.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$197.95 -
VERTEX Piston Kit 23614C
VERTEX
$170.95A piston kit is the foundation of reliable top-end performance, directly affecting power delivery, engine longevity, and overall durability. The VERTEX Piston Kit 23614C delivers precision-engineered components built to withstand extreme operating...09104647- SKU:
- 09104647
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON DIAMETER METRIC:
- 52.46 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$170.95 -
VERTEX Piston Kit with Gaskets VTK23614A
VERTEX
$223.95Whether you're rebuilding a high-mileage engine or upgrading to increased displacement, the VERTEX Piston Kit VTK23614A delivers the durability and performance you need for reliable power delivery. Built with forged 2618 aluminum and precision-engineered...09104648- SKU:
- 09104648
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 100 CC
- PISTON DIAMETER METRIC:
- 52.44 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$223.95
