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
-
Wiseco Piston Kit 56mm for Yamaha YZ125X 2020-2022 PK1391
WISECO
$239.95Wiseco PK1391 Piston Kit Elevate your 2-stroke motorcycle's performance with the Wiseco PK1391 Piston Kit. This top-tier upgrade is engineered for riders seeking unmatched power, efficiency, and durability. Whether you're racing or riding trails, this...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
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Kit - K1100 - +.25 mm 010-821-04PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Kit - K1100 - +.5 mm 010-821-05PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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: -
PROX Piston Kit 01.1408.150
PROX
$185.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances, Pistons supplied in a kit package that includes rings,...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
$185.95 -
VERTEX Piston Kit - Standard 22991A
VERTEX
$158.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09100984- 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
$158.95 -
VERTEX Piston Kit 22532B
VERTEX
$182.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09100987- 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
$182.95 -
VERTEX Piston Kit - Standard 23383A
VERTEX
$201.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09100990- 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
$201.95 -
Wiseco Piston Kit Standard 77mm 13.5:1 Kawasaki KX250F 2011-2014 40019M07700
WISECO
$224.95Wiseco 40019M07700 Piston Kit Elevate your Kawasaki KX250F's performance with the Wiseco 40019M07700 Piston Kit, designed for riders who demand the best. This piston kit combines cutting-edge engineering with premium materials to ensure optimal...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
$224.95 -
Wiseco Piston Kit Yamaha IT250 1978-1980 71mm Bore 234M07100
WISECO
$199.95Wiseco 234M07100 Piston Kit Unlock the full potential of your 2-stroke engine with the Wiseco 234M07100 Piston Kit. Designed for performance enthusiasts, this kit delivers unmatched reliability and precision, ensuring your motorcycle operates at its best...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
$199.95 -
Wiseco Piston Kit 88.00mm 12.3:1 Compression 2012-2016 KTM 350 EXC-F 40056M08800
WISECO
$244.95Wiseco 40056M08800 Piston Kit Elevate your motorcycle's performance with the Wiseco 40056M08800 Piston Kit. Engineered for enthusiasts seeking unparalleled power and longevity, this piston kit is a game changer for both trail and track riders. Experience...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
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit Yamaha DT100 1974-1983 52mm 235M05200
WISECO
$139.95Wiseco 235M05200 Piston Kit Transform your motorcycle's performance with the Wiseco 235M05200 Piston Kit. Engineered for precision and reliability, this kit is perfect for riders seeking enhanced power and responsiveness from their 2-stroke engines...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
$139.95Qty in Cart: 0Quantity:Price:$139.95Subtotal: -
Wiseco Piston Kit Yamaha XT500 1976-1981 4045M08700
WISECO
$239.95Wiseco 4045M08700 Piston Kit Transform your motorcycle's performance with the Wiseco 4045M08700 Piston Kit. Designed for enthusiasts who demand excellence, this kit enhances engine efficiency and power, ensuring you conquer every ride with confidence and...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
$199.95Wiseco 723M06640 Pro-Lite Piston Kit Transform your 2-stroke engine's performance with the Wiseco 723M06640 Pro-Lite Piston Kit, expertly crafted for riders who demand the best in durability and efficiency. This premium piston kit is designed to enhance...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
$199.95 -
Wiseco Yamaha YZ125 2002-2004 54mm Piston Kit 797M05400
WISECO
$144.95Wiseco 797M05400 Pro-Lite Piston Kit Transform your riding experience with the Wiseco 797M05400 Pro-Lite Piston Kit, specifically designed for 2-stroke enthusiasts. This advanced piston kit enhances engine performance, ensuring your bike operates at its...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
$144.95 -
Wiseco Piston Kit 56mm Oversize for Yamaha YZ 125 2005-2020 797M05600
WISECO
$174.95Wiseco 797M05600 Pro-Lite Piston Kit Elevate your motorcycle's performance with the Wiseco 797M05600 Pro-Lite Piston Kit. Designed specifically for 2-stroke engines, this kit delivers exceptional power and responsiveness, ensuring your ride is both...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
$149.95Wiseco 809M08000 Piston Kit Elevate your watercraft's performance with the Wiseco 809M08000 Piston Kit, specifically engineered for high-octane riders seeking unmatched reliability and power. Crafted with precision and designed to withstand extreme...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
$134.95Wiseco 4880M04750 Performance Piston Kit Elevate your dirt bike's performance with the Wiseco 4880M04750 Performance Piston Kit. Designed for both recreational and competitive riders, this kit ensures your engine operates at optimal levels, delivering...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
$274.95Wiseco PK1223 Piston Kit Unleash the full potential of your dirt bike with the Wiseco PK1223 Piston Kit. Designed for riders who demand exceptional performance and reliability, this piston kit ensures your engine operates at its peak, whether you're...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
$274.95 -
Wiseco Piston Kit 58mm 12:1 Compression for Honda CRF100F 2004-2013 4773M05800
WISECO
$169.95Wiseco 4773M05800 Piston Kit Elevate your dirt bike's performance with the Wiseco 4773M05800 Piston Kit, meticulously engineered for riders who demand excellence. This premium kit enhances engine efficiency, providing a thrilling riding experience...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
$169.95
