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 24105A
VERTEX
$71.95A quality piston kit is fundamental to engine reliability and performance longevity—especially under high-RPM and boost conditions. The VERTEX Piston Kit 24105A combines precision engineering with advanced surface treatments that reduce wear during...09104134- SKU:
- 09104134
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 50 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 38.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$71.95Qty in Cart: 0Quantity:Price:$71.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23236C
VERTEX
$342.95VERTEX high-compression pistons deliver the durability and precision required for sustained high-RPM performance without sacrificing reliability. Built with aerospace-grade heat treatment and factory-proven coatings, this kit reduces break-in friction...09103747- SKU:
- 09103747
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$342.95Qty in Cart: 0Quantity:Price:$342.95Subtotal: -
VERTEX Piston Kit VTKTC23259B
VERTEX
$314.95A high-performance piston kit must withstand extreme combustion pressures and thermal cycling without sacrificing reliability—especially if you're pushing peak horsepower. The VERTEX Piston Kit VTKTC23259B delivers the durability and precision required...09103751- SKU:
- 09103751
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
$314.95 -
VERTEX Piston Kit VTKTC23443B
VERTEX
$321.95A piston kit forms the foundation of any high-performance engine build, directly impacting compression, durability, and power output. The VERTEX Piston Kit VTKTC23443B delivers precision-engineered pistons built to withstand extreme combustion pressures...09103761- SKU:
- 09103761
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
$321.95Qty in Cart: 0Quantity:Price:$321.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23647B
VERTEX
$313.95High-compression pistons are essential for maximizing power output and engine efficiency in forced-induction and high-boost applications. The VERTEX Piston Kit delivers precision-engineered components that withstand extreme combustion pressures while...09103800- SKU:
- 09103800
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$313.95Qty in Cart: 0Quantity:Price:$313.95Subtotal: -
VERTEX Piston Kit 23711B
VERTEX
$302.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Piston Kit 23711B delivers the durability and precision needed for both street and race applications. Whether you're rebuilding a two-stroke or four-stroke engine, this...09102594- SKU:
- 09102594
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$302.95 -
VERTEX Piston Kit - Standard 22983B
VERTEX
$242.95If you're building or rebuilding an engine that demands reliability under sustained high RPM and load, OEM pistons often can't keep pace. The VERTEX Piston Kit 22983B delivers the durability and precision fit you need to maximize engine life and...09101043- SKU:
- 09101043
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$242.95 -
Wiseco Piston Kit for Honda CR250M 1975-1976 338M07000
WISECO
$199.95If you're running a 1975-1976 Honda CR250M, the stock piston won't survive sustained high-RPM riding or aggressive tuning. The Wiseco 338M07000 replaces worn or damaged pistons with OEM-spec geometry and materials that handle the demands of modern fuel...338M07000- SKU:
- 338M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- UTV
- DISPLACEMENT:
- 248 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.40 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 2mm Oversize for 1975-1977 Honda CR250M 338M07200
WISECO
$224.95When your two-stroke demands more displacement and sustained power, a quality piston kit is non-negotiable. The Wiseco 338M07200 delivers the precision engineering and material science needed to safely run 2mm over bore while maintaining reliability...338M07200- SKU:
- 338M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 248 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 72.00 MM
- STROKE LENGTH METRIC:
- 64.40 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 78mm 14.5:1 Compression Gas Gas EX 250F 2022 RE804M07800
WISECO
$377.95When you're pushing your Gas Gas EX 250F to its limits, a stock piston simply won't cut it. The Wiseco RE804M07800 delivers the precision engineering and durability you need to maximize power output while maintaining long-term reliability under extreme...09105073- SKU:
- 09105073
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$377.95 -
Wiseco 2-Stroke Piston Kit 47.5mm Honda CR85R 2003-2007 RE921M04750
WISECO
$159.95If you're running a CR85R hard, piston wear is inevitable—and factory replacements won't keep pace with aggressive riding or modified engines. The Wiseco RE921M04750 delivers the durability and precision tolerance you need to maintain peak compression,...09105077- SKU:
- 09105077
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$159.95Qty in Cart: 0Quantity:Price:$159.95Subtotal: -
Wiseco Piston Kit 80mm 10.5:1 Compression for Suzuki DR350 1990-1999 4576M08000
WISECO
$174.95If you're running a Suzuki DR350 and want measurable gains in power and reliability, a high-compression piston kit is one of the most direct upgrades available. The Wiseco 4576M08000 raises your compression ratio to 10.5:1, translating to stronger...4576M08000- SKU:
- 4576M08000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 79.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 349 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 71.20 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 2.00mm Oversize 52.95mm Yamaha YZ80 1976-1980 457M05100
WISECO
$144.95If you're rebuilding a YZ80 or chasing consistent power delivery on the track, a worn piston directly impacts compression, throttle response, and overall engine reliability. The Wiseco 457M05100 delivers the precision fit and thermal stability 2-stroke...457M05100- SKU:
- 457M05100
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 50.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 51.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit 49.50mm Honda CR85R 2003-2006 PK1217
WISECO
$197.95When a 2-stroke top-end fails, you need a piston kit engineered to restore—or exceed—stock performance. The Wiseco PK1217 delivers the precision bore and aerospace-grade materials that serious riders expect, whether you're rebuilding after wear or...09030175- SKU:
- 09030175
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 84.7 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 49.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 49.45 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
$197.95 -
Wiseco YZ125 2001 Piston Kit with Gaskets 56mm PK1351
WISECO
$234.95When your YZ125's original piston is worn or damaged, you're looking at lost compression, reduced power delivery, and potential engine damage if you don't address it quickly. The Wiseco PK1351 restores your 2-stroke's performance to factory spec—and then...09030176- SKU:
- 09030176
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Wiseco Honda XR200R 1992-2002 Piston Kit with Gaskets PK1124
WISECO
$204.95If you're rebuilding your XR200R's top end, the Wiseco PK1124 delivers the precision and durability you need to extract reliable power from your engine. The forged aluminum construction and 10.25:1 compression ratio give you measurable gains in...09030212- SKU:
- 09030212
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 192 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON DIAMETER METRIC:
- 65.45 MM
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 65.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Piston Kit with Gaskets for Honda XR250R 1986-2004 73.50mm 10.5:1 PK1220
WISECO
$257.95When your Honda XR250R's original piston shows wear or you're rebuilding after hard trail use, this Wiseco kit delivers the precision and durability needed to restore—or exceed—factory performance. The 10.5:1 compression ratio balances increased power...09030216- SKU:
- 09030216
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 73.45 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 73.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$257.95Qty in Cart: 0Quantity:Price:$257.95Subtotal: -
Wiseco Piston Kit 54mm Honda XR100R 1985-1991 PK1274
WISECO
$184.95If you're rebuilding your Honda XR100R's top end, a quality piston kit is non-negotiable—it's the foundation of reliable power delivery and engine longevity. The Wiseco PK1274 delivers OEM-level fitment with a forged aluminum construction that handles...09030242- SKU:
- 09030242
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 99.2 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 54.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 45.00 MM
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 53.97 MM
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Suzuki RM85 2002-2023 Piston Kit with Gaskets PK1210
WISECO
$214.95The Wiseco PK1210 is engineered to restore your RM85's original performance or push it beyond stock capability with precision-forged components that withstand the demands of competitive motocross. Whether you're rebuilding after race wear or upgrading a...09030294- SKU:
- 09030294
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 52.00 MM
- MODEL:
- RACER'S CHOICE
- STROKE LENGTH METRIC:
- 46.80 MM
- TYPE:
- TOP END
- DISPLACEMENT:
- 99,4 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +5.00 MM
- COOLING SYSTEM:
- LIQUID COOLED
- BORE - OVERSIZE:
- +5,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$214.95Qty in Cart: 0Quantity:Price:$214.95Subtotal: -
Wiseco Piston Kit +1.50 mm Yamaha YZ 250 2002-2024 560M06950
WISECO
$224.95If you're running a YZ250 2-stroke at the limit, factory pistons won't cut it. The Wiseco 560M06950 delivers the precision bore diameter and durable aluminum construction needed to handle competitive riding and high-RPM abuse. This complete kit includes...560M06950- SKU:
- 560M06950
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.50 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE SIZE METRIC:
- 69.50 MM
- DISPLACEMENT:
- 246,8 CC
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal:
