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 - Standard 22189B
VERTEX
$158.95The VERTEX Piston Kit 22189B is engineered for builders who demand precision and longevity in high-demand engines. Heat-treated to exacting standards and coated with advanced molybdenum disulfide, these pistons accelerate break-in while maximizing ring...09101027- SKU:
- 09101027
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$158.95 -
VERTEX Piston Kit - Standard 22685C
VERTEX
$164.95A piston kit is one of the most critical investments you can make for engine reliability and longevity. The VERTEX Piston Kit 22685C delivers the durability and precision needed for high-performance builds, whether you're pushing power on the track or...09101028- SKU:
- 09101028
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$164.95 -
VERTEX Piston Kit - Standard 22581B
VERTEX
$235.95A piston kit is the heart of your engine's combustion process, and choosing the right one directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 22581B delivers the durability and precision you need for consistent power...09101033- SKU:
- 09101033
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit - Standard 23133B
VERTEX
$208.95The VERTEX Piston Kit 23133B delivers the durability and precision your engine demands during high-stress operation. Purpose-built with advanced heat treatment and low-friction coatings, these pistons minimize wear during break-in while maintaining...09101035- SKU:
- 09101035
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$208.95Qty in Cart: 0Quantity:Price:$208.95Subtotal: -
VERTEX Piston Kit - Standard 22447
VERTEX
$242.95Precision-engineered pistons are the backbone of reliable high-RPM performance, and the VERTEX Standard 22447 delivers the durability needed for both street and track applications. The advanced heat-treatment process and specialized coating reduce...09101036- SKU:
- 09101036
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 500 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON DIAMETER METRIC:
- 88.95 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 89.00 MM
- STYLE:
- CAST REPLICA
$242.95 -
VERTEX Piston Kit 22860B
VERTEX
$131.95The VERTEX Piston Kit 22860B delivers the durability and precision you need to maximize engine performance and reliability under extreme conditions. Whether you're rebuilding after hard use or upgrading for increased displacement and power, this kit...09101048- SKU:
- 09101048
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 65 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 44.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$131.95 -
VERTEX Piston Kit - Standard 22803B
VERTEX
$131.95VERTEX pistons are engineered for maximum durability and reliability in high-demand racing and performance applications. The T-5 heat treatment process ensures superior hardness and fatigue resistance under extreme combustion pressures and thermal...09101051- SKU:
- 09101051
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CYLINDER DIAMETER METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.45 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
VERTEX Piston Kit 23621A
VERTEX
$208.95Whether you're rebuilding a worn top-end or upgrading to higher compression, the VERTEX Piston Kit 23621A delivers the durability and performance you need to maximize power and reliability. Built with precision heat treatment and a molybdenum disulfide...09103395- SKU:
- 09103395
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- PISTON DIAMETER METRIC:
- 52.44 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$208.95 -
VERTEX Piston Kit 23958A
VERTEX
$274.95A piston kit is only as reliable as its material composition and heat treatment—and the VERTEX 23958A delivers both in spades. If you're building an engine that needs to withstand sustained high RPM loads without sacrificing ring seal or longevity, this...09103396- SKU:
- 09103396
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$274.95 -
VERTEX Piston Kit 23958B
VERTEX
$262.95The VERTEX Piston Kit 23958B delivers the durability and precision required for sustained high-RPM performance. Whether you're pushing limits on the track or maximizing street power, these pistons are engineered to handle extreme combustion pressures...09103397- SKU:
- 09103397
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$262.95 -
VERTEX Piston Kit 23384400
VERTEX
$208.95If you're building or rebuilding an engine that demands reliability under extreme conditions, piston quality directly impacts your engine's longevity and performance threshold. The VERTEX Piston Kit 23384400 delivers the durability and precision...09102540- SKU:
- 09102540
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$208.95 -
VERTEX Piston Kit 22356A
VERTEX
$208.95If you're building a high-revving engine or refreshing a worn bottom end, piston quality directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 22356A delivers the metallurgical precision and surface engineering that...09102541- SKU:
- 09102541
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 67.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 22584A
VERTEX
$183.95Your engine's performance and longevity depend on pistons engineered for both strength and precision. The VERTEX Piston Kit 22584A delivers forged durability with optimized geometry to maximize power across the entire RPM range while minimizing break-in...09102542- SKU:
- 09102542
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$183.95 -
VERTEX Piston Kit 22600B
VERTEX
$177.95A quality piston kit is the foundation of a reliable, high-performance top end. The VERTEX Piston Kit 22600B delivers the durability and precision needed for sustained power, whether you're rebuilding after race wear or upgrading to forged internals for...09102543- SKU:
- 09102543
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$177.95 -
VERTEX Piston Kit 22601B
VERTEX
$218.95A quality piston kit is the foundation of engine reliability and performance—especially if you're pushing RPMs or rebuilding after wear. The VERTEX Piston Kit 22601B delivers the durability and precision you need to maintain peak power delivery without...09102544- SKU:
- 09102544
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.95 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
VERTEX Piston Kit 22926C
VERTEX
$223.95The VERTEX Piston Kit 22926C is engineered for builders who demand reliability under extreme combustion pressures. Purpose-built with advanced heat treatment and low-friction coatings, these pistons accelerate break-in while extending service life in...09102547- SKU:
- 09102547
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.96 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
$223.95 -
VERTEX Piston Kit 23235B
VERTEX
$302.95The VERTEX Piston Kit 23235B delivers the precision and durability demanded by serious racers and high-performance engines. Purpose-built with advanced heat-treatment and low-friction coatings, these pistons reduce break-in time while maximizing ring...09102549- SKU:
- 09102549
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
Wiseco Piston Honda CRF450R 2002-2008 96mm 12.5:1 449cc 4780M10100
WISECO
$134.95Whether you're rebuilding a tired CRF450R or preparing for peak performance, the Wiseco 96mm piston delivers the compression ratio and material science you need to extract maximum horsepower and reliability from your engine. Factory pistons wear, lose...450M05000- SKU:
- 450M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 49.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Yamaha YZ450F 2014-2017 12.5:1 97mm 40111M09700
WISECO
$239.95A worn or stock piston limits your YZ450F's potential—this Wiseco kit restores and exceeds OEM performance with a higher 12.5:1 compression ratio that unlocks measurable gains in peak horsepower and mid-range torque. The precision-engineered 97mm piston...09103910- SKU:
- 09103910
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 60.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 97.00 MM
- DISPLACEMENT:
- 449 CC
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit 44.5mm for Kawasaki KX65 2000-2026 RE919M04450
WISECO
$171.95When you're running a KX65 hard on the track or trail, stock pistons won't cut it—they'll fatigue, wear unevenly, and rob you of power just when you need it most. The Wiseco Racer Elite Piston Kit is engineered to handle the extreme pressures and...09105087- SKU:
- 09105087
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal:
