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 - +2.00 mm - XR100/R/CRF100F 4666M05500
WISECO
$169.95Pistons come without gasket kit09100331- SKU:
- 09100331
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 107,00 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$169.95 -
Wiseco Piston Kit 65.5mm 11:1 Compression Honda CRF230F 2003-2019 4816M06550
WISECO
$169.95Enhance your CRF230F's performance with the WISECO Piston Kit, designed for durability and precision. This kit provides a reliable replacement to keep your engine running smoothly, ensuring optimal power and efficiency. Please note that this kit does not...09100332- SKU:
- 09100332
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 223,00 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 66.20 MM
$169.95 -
Wiseco Piston Honda CB750 1979-1982 871M08950
WISECO
$234.95Upgrade your engine's performance with the WISECO Piston Honda .50mm 871M08950. Designed for durability and efficiency, this piston ensures optimal compression and power output. Please note that this product does not include a gasket kit, so be sure to...09102023- SKU:
- 09102023
- Availability:
- Ships Same Business Day
- Weight:
- 1.24 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 89.50 MM
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
- DISPLACEMENT:
- 472 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 76.00 MM
- PISTON MATERIAL:
- FORGED
$234.95 -
Wiseco Piston Kit Honda CR500R 1984-2001 90mm 871M09000
WISECO
$234.95Upgrade your engine's performance with the WISECO Piston designed specifically for Honda models. This high-quality piston enhances durability and efficiency, ensuring optimal power delivery. Please note that this product is sold without a gasket kit,...09102024- SKU:
- 09102024
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- DISPLACEMENT:
- 472 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 79.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 491 CC
- PISTON MATERIAL:
- ALUMINUM
$234.95 -
Wiseco Piston Kit 47mm 11:1 Compression Yamaha TT-R90 2000-2007 4840M04700
WISECO
$154.95The WISECO Piston Kit Standard 4840M04700 is engineered for optimal performance, providing a reliable upgrade for your engine. Designed for durability and precision, this piston kit ensures enhanced power and efficiency. Please note that this kit does...09100368- SKU:
- 09100368
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 51.80 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- DISPLACEMENT:
- 90 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$154.95 -
Wiseco Honda CRF450R 2002-2008 Piston Kit with Gaskets PK1365
WISECO
$324.95Enhance your engine's performance with the WISECO Piston Kit, meticulously crafted to deliver exceptional strength and durability. This complete kit includes everything needed for a top-end rebuild, ensuring optimal operation and reliability in...09030567- SKU:
- 09030567
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.94 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$324.95 -
Wiseco Piston Kit 70.50mm Oversize for Yamaha IT250 1978-1980 234M07050
WISECO
$199.95Engineered for performance and durability, the WISECO Piston Yamaha .50mm 234M07050 is crafted from a high-silicon alloy, ensuring exceptional strength and reliability in demanding conditions. This piston is designed for both trail and racing...234M07050- SKU:
- 234M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 70.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$199.95 -
Wiseco Piston Kit Kawasaki KX250F 2011-2014 77mm 14.5:1 40020M07700
WISECO
$264.95Upgrade your KX 250 F with the WISECO Piston Kit, designed for optimal performance and durability. This piston kit enhances engine efficiency and power, ensuring you get the most out of your ride. Please note that this kit does not include a gasket set,...09102896- SKU:
- 09102896
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- DISPLACEMENT:
- 250 CC
$264.95 -
Wiseco Piston Kit 2.00mm Oversize 73.95mm Yamaha YZ250 1976-1979 234M07200
WISECO
$224.95Engineered for unparalleled performance, the WISECO 234M07200 piston is forged from a high-silicon alloy, ensuring exceptional strength and reliability for both trail and racing enthusiasts. This piston is designed to enhance engine efficiency and...234M07200- SKU:
- 234M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +2,00 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- PRODUCT NAME:
- PISTON KIT
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit for KTM 500 EXC 2012-2016 40064M09500
WISECO
$254.95Enhance your KTM 500 EXC's performance with the WISECO Piston Kit, designed for durability and efficiency. This high-quality piston kit is engineered to deliver optimal power and reliability, ensuring a smoother ride on any terrain. Please note that a...09102898- SKU:
- 09102898
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 95.00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 510 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$254.95 -
Wiseco Piston Kit 53.00mm 1.00mm Oversize Yamaha MX100 1979-1983 235M05300
WISECO
$139.95Engineered for optimal performance, the Wiseco Piston is crafted from a high-silicon alloy, ensuring exceptional strength and reliability. Designed to meet the demands of both trail and racing applications, this piston provides the perfect balance of...235M05300- SKU:
- 235M05300
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 98 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 52.95 MM
- BORE SIZE METRIC:
- 53.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
$139.95 -
Wiseco Piston Kit Yamaha DT400 1975-1978 85.50mm 232M08550
WISECO
$209.95Engineered for performance and durability, the WISECO Piston is crafted from a high-silicon alloy, ensuring exceptional strength for both trail and racing applications. This piston is designed to enhance your engine's efficiency and longevity, making it...232M08550- SKU:
- 232M08550
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 85.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON DIAMETER METRIC:
- 85.42 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 397 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 70.00 MM
$209.95 -
Wiseco Piston Kit Kawasaki KX250 2002-2004 799M06750
WISECO
$184.95Upgrade your KX250 with the WISECO Piston Kit, designed for optimal performance and durability. This high-quality piston kit enhances engine efficiency, ensuring you get the most out of your ride. Please note that this kit does not include a gasket kit,...09101242- SKU:
- 09101242
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.10 MM
- DISPLACEMENT:
- 249,3 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$184.95 -
Wiseco Piston Kit 67.5mm Honda CR250R 2002-2004 801M06750
WISECO
$184.95Enhance the performance of your CR250 with the WISECO Piston Kit, designed specifically for models from 2002 to 2004. This high-quality piston kit is engineered for durability and optimal power output, ensuring your bike runs smoothly and efficiently...09101243- SKU:
- 09101243
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +1.10 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +1,10 MM
- BORE SIZE METRIC:
- 67.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$184.95 -
Wiseco Piston Kit Yamaha YZ250 2002-2025 804M06700
WISECO
$184.95Elevate your bike's performance with the WISECO Piston Kit designed specifically for the YZ 250/X models. This high-quality piston kit ensures optimal engine efficiency and reliability, allowing for enhanced power and smoother operation. Please note that...09101244- SKU:
- 09101244
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 67.00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.60 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,60 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
$184.95 -
Wiseco Piston Kit Yamaha YZ250 2002-2025 804M06750
WISECO
$184.95Enhance the performance of your YZ 250/X with the WISECO Piston Kit. Designed for durability and efficiency, this piston kit ensures optimal engine performance and longevity. Please note that the kit does not include a gasket set, so be sure to purchase...09101245- SKU:
- 09101245
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 67.50 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- +1.10 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$184.95 -
WISECO Piston Kit - Kawasaki WK1061
WISECO
$389.95Wiseco High-Performance 2-Cycle Piston WK1061 Forged from high-silicone bar stock for enhanced durability. Designed for greater strength and reduced thermal expansion. Complete piston kits include everything needed for a full engine rebuild. Includes...WK1061- SKU:
- WK1061
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- DISPLACEMENT:
- 760 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 80.89 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 81.00 MM
- PRODUCT NAME:
- REBUILD KIT
$389.95Qty in Cart: 0Quantity:Price:$389.95Subtotal: -
Wiseco Piston Kit Standard 56mm Bore KTM 150 SX 2009-2015 869M05600
WISECO
$184.95Elevate your bike's performance with the WISECO Piston Kit, designed specifically for the 144/150SX models. This high-quality piston kit ensures optimal engine efficiency and durability, allowing for a smoother ride and enhanced power delivery. Please...09102883- SKU:
- 09102883
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 58.50 MM
$184.95 -
Wiseco Piston Kit Standard Bore 97mm 12.5:1 Compression Yamaha YZ450F 2010-2013 40001M09700
WISECO
$239.95Upgrade your YZ450F with the WISECO Piston Kit, designed to enhance performance and reliability. This high-quality piston kit ensures optimal engine function, delivering power and efficiency for your off-road adventures. Please note that this kit does...09102884- SKU:
- 09102884
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- STROKE LENGTH METRIC:
- 60.80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 97.00 MM
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- FORGED
$239.95 -
Wiseco Piston Kit Standard Bore 97mm 13.5:1 Compression Yamaha YZ450F 2010-2013 40002M09700
WISECO
$269.95Upgrade your YZ450F with the WISECO Piston Kit, designed for optimal performance and durability. This high-quality piston kit enhances engine efficiency, ensuring smoother operation and increased horsepower. Please note that the kit is sold without a...09102885- SKU:
- 09102885
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- STROKE LENGTH METRIC:
- 60.80 MM
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- BORE SIZE METRIC:
- 97.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$269.95
