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 - High Compression VTKTC23561A
VERTEX
$319.95High-compression pistons demand precision engineering and material science to withstand extreme combustion pressures and sustained RPMs. The VERTEX Piston Kit delivers both through advanced heat treatment and specialized coatings that reduce friction...09103775- SKU:
- 09103775
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
$319.95Qty in Cart: 0Quantity:Price:$319.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23561B
VERTEX
$296.95If you're building or rebuilding an engine for competition or high-performance street use, piston quality directly impacts reliability under extreme combustion pressures and temperatures. The VERTEX Piston Kit VTKTC23561B delivers forged durability and...09103776- SKU:
- 09103776
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
$296.95 -
VERTEX Piston Kit VTKTC23562A
VERTEX
$362.95The VERTEX Piston Kit VTKTC23562A delivers the precision and durability required for sustained high-RPM performance. Built with industry-leading metallurgy and surface treatments, these pistons minimize friction during break-in while extending service...09103778- SKU:
- 09103778
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
$362.95Qty in Cart: 0Quantity:Price:$362.95Subtotal: -
VERTEX Piston Kit VTKTC23566B
VERTEX
$315.95If 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 VTKTC23566B delivers the durability and precision you...09103791- SKU:
- 09103791
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit VTKTC23641A
VERTEX
$380.95A piston kit is the foundation of any high-performance engine build, directly impacting compression efficiency, durability under extreme combustion pressures, and overall engine longevity. The VERTEX Piston Kit VTKTC23641A delivers precision-engineered...09103793- SKU:
- 09103793
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
$380.95 -
VERTEX Piston Kit VTKTC23646A
VERTEX
$321.95A quality piston kit is the foundation of engine reliability and performance—especially under high-RPM demands where inferior pistons fail prematurely. The VERTEX Piston Kit VTKTC23646A delivers the durability and precision you need to build or rebuild...09103796- SKU:
- 09103796
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$321.95Qty in Cart: 0Quantity:Price:$321.95Subtotal: -
VERTEX Piston Kit VTKTC23646B
VERTEX
$315.95A high-performance piston kit demands precision engineering and material science that withstands extreme combustion pressures and thermal cycling. The VERTEX Piston Kit VTKTC23646B delivers both through advanced heat treatment and surface coatings that...09103797- SKU:
- 09103797
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
$315.95 -
VERTEX Piston Kit - High Compression VTKTC23647A
VERTEX
$348.95When you're building or rebuilding an engine, piston quality directly impacts power delivery, reliability, and longevity under sustained load. The VERTEX Piston Kit VTKTC23647A delivers the metallurgical precision and surface engineering needed to handle...09103799- SKU:
- 09103799
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
$348.95Qty in Cart: 0Quantity:Price:$348.95Subtotal: -
VERTEX Piston Kit VTKTC23855A
VERTEX
$319.95A quality piston kit is the foundation of any reliable high-performance build—VERTEX delivers the durability and precision demanded by serious racers and builders. The T-5 heat treatment and molybdenum disulfide coating reduce friction during critical...09103802- SKU:
- 09103802
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
$319.95Qty in Cart: 0Quantity:Price:$319.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23855B
VERTEX
$354.95If you're building a high-compression engine that demands reliability under sustained load, the VERTEX Piston Kit VTKTC23855B delivers the durability and precision required for serious racing applications. These pistons are engineered to withstand...09103803- SKU:
- 09103803
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
$354.95 -
VERTEX Piston Kit - High Compression VTKTC23856B
VERTEX
$342.95If you're building a high-compression engine that demands reliability under extreme combustion pressures, the VERTEX Piston Kit (VTKTC23856B) delivers the durability and precision required to maintain peak performance lap after lap. These pistons are...09103806- SKU:
- 09103806
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
$342.95Qty in Cart: 0Quantity:Price:$342.95Subtotal: -
VERTEX Piston Kit 23679B
VERTEX
$236.95A piston kit is only as reliable as its material composition and heat treatment—factors that directly impact engine longevity under sustained high RPM and boost conditions. The VERTEX Piston Kit 23679B delivers precision-engineered pistons with T-5 heat...09102585- SKU:
- 09102585
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- PRODUCT NAME:
- PISTON KIT
$236.95 -
VERTEX Piston Kit 23711A
VERTEX
$302.95Whether you're rebuilding a tired engine or pushing higher compression ratios for competition, the VERTEX Piston Kit 23711A delivers the durability and precision needed for reliable power across the entire RPM range. VERTEX's commitment to...09102593- SKU:
- 09102593
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$302.95 -
VERTEX Piston Kit 23653B
VERTEX
$315.95Whether you're rebuilding a two-stroke or four-stroke engine, piston selection directly impacts durability, power delivery, and longevity under sustained load. The VERTEX Piston Kit 23653B delivers OEM-quality construction with forged aluminum strength...09102040- SKU:
- 09102040
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +3.20 MM
- CYLINDER DIAMETER METRIC:
- 80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +3,20 MM
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- DISPLACEMENT:
- 270 CC
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$315.95 -
VERTEX Piston Kit 23637B
VERTEX
$171.95The VERTEX Piston Kit 23637B delivers reliable, high-performance pistons engineered for extended engine life and consistent power delivery. Whether you're rebuilding a worn top end or upgrading to higher compression, VERTEX pistons combine precision...09102048- SKU:
- 09102048
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 48.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$171.95 -
VERTEX Piston Kit VTK22863B-1
VERTEX
$150.95A piston kit is the heart of your engine's combustion cycle—and VERTEX engineered the VTK22863B-1 to deliver the reliability and precision that separates consistent power from catastrophic failure. The advanced T-5 heat treatment process ensures your...09103027- SKU:
- 09103027
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- PRODUCT NAME:
- TOP END PISTON KIT
$150.95 -
VERTEX Piston Kit VTKTC23003A
VERTEX
$341.95Piston failure cuts racing short and empties wallets fast. The VERTEX Piston Kit VTKTC23003A delivers the durability and precision needed for sustained high-RPM performance, with advanced metallurgy and coatings engineered to withstand extreme combustion...09103727- SKU:
- 09103727
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$341.95Qty in Cart: 0Quantity:Price:$341.95Subtotal: -
VERTEX Piston Kit - Standard 23375B
VERTEX
$254.95Engine durability and longevity depend on pistons that can withstand extreme combustion pressures and thermal cycling without compromise. The VERTEX Piston Kit 23375B delivers the precision engineering and material science required for reliable...09101002- SKU:
- 09101002
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$254.95 -
VERTEX Piston Kit - Standard 23429CD
VERTEX
$99.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 23429CD delivers the durability required for sustained boost and aggressive tuning. Built with advanced metallurgy and surface treatments, these...09102065- SKU:
- 09102065
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$99.95 -
VERTEX Piston Kit 24101B
VERTEX
$223.95The VERTEX Piston Kit 24101B delivers the reliability and performance precision you need for consistent power delivery across the entire RPM range. Whether you're rebuilding a tired top end or stepping up displacement and compression, VERTEX pistons are...09104071- SKU:
- 09104071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 57.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 58 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- CAST REPLICA
$223.95
