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 56mm for Yamaha YZ125X 2020-2022 PK1391
WISECO
$239.95When your YZ125X's top-end reaches the end of its service life, a quality piston kit is the difference between a reliable rebuild and premature failure. The Wiseco PK1391 delivers OEM-equivalent precision with high-silicon forged aluminum construction...09030681- SKU:
- 09030681
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- COOLING SYSTEM:
- AIR COOLED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 134 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$239.95 -
WSM Piston Kit - K1100 - Standard 010-821PK
WSM
$98.28When you're building or rebuilding an engine, piston quality directly impacts power output, reliability, and longevity. The WSM K1100 Piston Kit delivers OEM-equivalent construction with engineering enhancements—specifically, a MOS2 coating that actively...010821P- SKU:
- 010821P
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- MODEL:
- PLATINUM
$98.28 -
WSM Piston Kit - K1100 - +.25 mm 010-821-04PK
WSM
$98.28High-performance pistons are the foundation of reliable power delivery under sustained boost and RPM, and OEM units often compromise on thermal management and durability. The WSM K1100 Piston Kit delivers OEM-equivalent construction with purposeful...01082104P- SKU:
- 01082104P
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$98.28 -
WSM Piston Kit - K1100 - +.5 mm 010-821-05PK
WSM
$93.60Whether you're chasing tighter tolerances in a rebuild or maximizing power output in a high-revving engine, OEM pistons often fall short of what serious builders demand. The WSM Piston Kit delivers OEM-matching quality with purposeful...01082105P- SKU:
- 01082105P
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
On Sale
PROX Piston Kit 01.1408.150
PROX
MSRP: $185.95Now: $158.00Was: $185.95When your engine demands reliability under extreme conditions, OEM-spec pistons are non-negotiable. The PROX Piston Kit 01.1408.150 delivers factory-matched performance with the precision engineering required for consistent power delivery and longevity...09030820- SKU:
- 09030820
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
- PISTON SIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON KIT
MSRP: $185.95Now: $158.00Was: $185.95 -
VERTEX Piston Kit - Standard 22991A
VERTEX
$171.95Piston durability and engine longevity depend on materials that withstand extreme combustion pressures and thermal cycling. The VERTEX Piston Kit 22991A combines proprietary heat treatment with a specialized skirt coating that reduces friction during...09100984- SKU:
- 09100984
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 105 CC
- PISTON DIAMETER METRIC:
- 51.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 52.00 MM
- STYLE:
- CAST REPLICA
$171.95 -
VERTEX Piston Kit 22532B
VERTEX
$197.95A quality piston kit is fundamental to engine reliability and performance—especially under high-load conditions where inferior materials fail. The VERTEX Piston Kit 22532B delivers the durability and precision you need for consistent power delivery,...09100987- SKU:
- 09100987
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PISTON DIAMETER METRIC:
- 54.20 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.25 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$197.95Qty in Cart: 0Quantity:Price:$197.95Subtotal: -
VERTEX Piston Kit - Standard 23383A
VERTEX
$217.95VERTEX pistons are engineered for consistent power delivery and extended engine life, making them the choice for builders who demand reliability under sustained high RPM operation. The T-5 heat treatment process ensures superior hardness and dimensional...09100990- SKU:
- 09100990
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 55.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95 -
Wiseco Piston Kit Standard 77mm 13.5:1 Kawasaki KX250F 2011-2014 40019M07700
WISECO
$224.95When your KX250F's stock piston reaches its limit, a quality replacement isn't optional—it's essential for maintaining power delivery and engine longevity. The Wiseco 40019M07700 delivers the compression ratio and durability expected in modern 4-stroke...09102895- SKU:
- 09102895
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 250 CC
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Yamaha IT250 1978-1980 71mm Bore 234M07100
WISECO
$210.95The Wiseco 234M07100 piston kit restores or upgrades your Yamaha IT250's top-end with OEM-quality precision and proven durability. Wiseco's forged aluminum construction handles sustained high-RPM running and aggressive 2-stroke conditions without...234M07100- SKU:
- 234M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 71.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 64.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 70.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$210.95 -
Wiseco Piston Kit 88.00mm 12.3:1 Compression 2012-2016 KTM 350 EXC-F 40056M08800
WISECO
$255.95If you're running a 2012-2016 KTM 350 EXC-F and want measurable gains in throttle response and peak power, a high-compression piston upgrade is one of the most effective bolt-on modifications available. The Wiseco 40056M08800 delivers a 12.3:1...09102897- SKU:
- 09102897
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- STROKE LENGTH METRIC:
- 57.50 MM
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- DISPLACEMENT:
- 350 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$255.95 -
Wiseco Piston Kit Yamaha DT100 1974-1983 52mm 235M05200
WISECO
$148.95A worn or damaged piston directly undermines engine compression, throttle response, and reliability—especially critical in 2-stroke engines where combustion efficiency is everything. The Wiseco 235M05200 restores lost performance and longevity with a...235M05200- SKU:
- 235M05200
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- DISPLACEMENT:
- 98 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 51.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
Wiseco Piston Kit Yamaha XT500 1976-1981 4045M08700
WISECO
$239.95If you're running an XT500 and want measurable gains in power delivery and engine reliability, the Wiseco 4045M08700 piston kit is the upgrade that separates committed builders from casual riders. A 10:1 compression ratio paired with aerospace-grade...09102899- SKU:
- 09102899
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 499 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 87.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$239.95 -
Wiseco Piston Kit Standard Bore 66.40mm for Suzuki RM250 1998 723M06640
WISECO
$199.95The Wiseco 723M06640 Pro-Lite Piston Kit delivers the precision and durability your RM250 needs to handle sustained high-RPM operation without compromise. Built from aerospace-grade aluminum and CNC-machined for exact fitment, this kit restores your...723M06640- SKU:
- 723M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Yamaha YZ125 2002-2004 54mm Piston Kit 797M05400
WISECO
$160.95Stock pistons can't handle the demands of aggressive riding—they wear quickly and cost you power when you need it most. The Wiseco 797M05400 Pro-Lite Piston Kit delivers the precision engineering and durable construction required to maximize performance...797M05400- SKU:
- 797M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$160.95 -
Wiseco Piston Kit 56mm Oversize for Yamaha YZ 125 2005-2020 797M05600
WISECO
$174.95When you're pushing a YZ125 to the limit, your piston kit needs to match your commitment. The Wiseco 797M05600 Pro-Lite delivers the precision fit and lightweight strength that separates consistent lap times from DNFs. Built on racing-proven forging...797M05600- SKU:
- 797M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$174.95 -
Wiseco 1996-2003 Kawasaki Jet Ski 1100 ZXi 809M08000
WISECO
$149.95The stock piston in your 1996-2003 Kawasaki Jet Ski 1100 ZXi is likely your biggest bottleneck for consistent power delivery and engine longevity. Wiseco's aerospace-grade forged aluminum construction handles the extreme thermal and mechanical demands of...809M08000- SKU:
- 809M08000
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- DISPLACEMENT:
- 743 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 1071 CC
- PRODUCT NAME:
- PISTON
$149.95 -
Wiseco Piston Kit 0.50mm Oversize 10.5:1 Compression Honda XR70R 1997-2003 4880M04750
WISECO
$134.95A worn or stock piston limits your XR70R's potential—restricting power delivery and throttle response when you need it most. The Wiseco 4880M04750 replaces that limitation with a forged-aluminum piston engineered for higher compression and better heat...09100748- SKU:
- 09100748
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 73 CC
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$134.95 -
Wiseco Piston Kit with Gaskets for Honda XR250R 1986-2004 PK1223
WISECO
$297.95The stock piston in your XR250R will eventually wear, lose compression, and cost you performance when you need it most. A quality rebuild with Wiseco's forged-aluminum piston kit restores your engine's original power while improving durability for hard...09030570- SKU:
- 09030570
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +4,00 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON DIAMETER METRIC:
- 76.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
$297.95 -
Wiseco Piston Kit 58mm 12:1 Compression for Honda CRF100F 2004-2013 4773M05800
WISECO
$169.95If you're rebuilding a CRF100F or pushing your existing engine toward higher output, piston selection directly impacts reliability and power delivery. Wiseco's 12:1 compression ratio opens up meaningful gains in both peak power and throttle response,...09100752- SKU:
- 09100752
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +5,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- BORE SIZE METRIC:
- 58.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +5.00 MM
- DISPLACEMENT:
- 120 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal:
