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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JE PISTONS Piston Kit 292330
JE PISTONS
$269.99Machined from 2618-T6 high-tensile forged aluminum, Dome/dish features smooth flowing radii; requires no deburring or preparation, Specifically engineered for extreme applications including professional competition, Pro Series pistons available for...09105906- SKU:
- 09105906
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- BORE - OVERSIZE METRIC:
- +1.00 MM
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- RIDING STYLE:
- OFF-ROAD
$269.99 -
JE PISTONS Piston Kit 299245
JE PISTONS
$309.99Machined from 2618-T6 high-tensile forged aluminum, Dome/dish features smooth flowing radii; requires no deburring or preparation, Specifically engineered for extreme applications including professional competition, Pro Series pistons available for...09105908- SKU:
- 09105908
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
$309.99 -
JE PISTONS Piston Kit 300275
JE PISTONS
$269.99Machined from 2618-T6 high-tensile forged aluminum, Dome/dish features smooth flowing radii; requires no deburring or preparation, Specifically engineered for extreme applications including professional competition, Pro Series pistons available for...09105912- SKU:
- 09105912
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 644 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON HEAD SHAPE:
- FLAT TOP
- STYLE:
- JE PISTON
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
$269.99 -
JE PISTONS Piston Kit 300276
JE PISTONS
$269.99Machined from 2618-T6 high-tensile forged aluminum, Dome/dish features smooth flowing radii; requires no deburring or preparation, Specifically engineered for extreme applications including professional competition, Pro Series pistons available for...09105913- SKU:
- 09105913
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- DISPLACEMENT:
- 650 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 101.00 MM
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
$269.99 -
Wossner Piston Kit Kawasaki KX85 2001-2025 8082DB
WOSSNER
$152.00Experience unparalleled performance with the WOSSNER Piston Kit 8082DB, designed specifically for 2-stroke engines. Crafted with precision engineering and advanced materials, this piston kit enhances your engine's efficiency and longevity, ensuring...09105507- SKU:
- 09105507
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
$152.00 -
Wossner Piston Kit Suzuki RM250 2003-2008 8086DA
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8086DA, designed for 2-stroke engines. Crafted from premium materials and engineered in Germany, this piston kit ensures optimal efficiency and durability, making it the perfect upgrade for...09104806- SKU:
- 09104806
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$122.00 -
Wiseco Piston Kit 48.50mm for Suzuki RM85 2002-2023 806M04850
WISECO
$119.95Upgrade your engine's performance with the WISECO Piston Kit 806M04850, designed for durability and precision. This high-quality piston kit enhances power and efficiency, ensuring a smoother ride and improved throttle response. Please note that this kit...09101248- SKU:
- 09101248
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95 -
Wiseco Yamaha Blaster 200 1988-2006 Piston Kit with Gaskets PK1098
WISECO
$219.95Upgrade your engine's performance with the WISECO Piston Kit, designed for high durability and efficiency. This complete kit includes everything you need for a successful installation, ensuring optimal power and reliability in your 2-cycle engine. ...09030453- SKU:
- 09030453
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- +2,25 MM
- BORE SIZE METRIC:
- 68.25 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.25 MM
- DISPLACEMENT:
- 195 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 68.20 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$219.95 -
Wiseco Piston Kit with Gaskets for Yamaha YFS200 Blaster 1988-2006 66.75mm PK1092
WISECO
$204.95Enhance your engine's performance with the WISECO Piston Kit, designed specifically for 2-cycle engines. Crafted from high-silicone forged bar stock, this kit ensures superior strength and minimal thermal expansion, making it ideal for high-performance...09030454- SKU:
- 09030454
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 66.75 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 57.00 MM
- BORE - OVERSIZE:
- +0,75 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.75 MM
- DISPLACEMENT:
- 195 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 66.70 MM
- PRODUCT NAME:
- REBUILD KIT
$204.95 -
Wiseco Piston Kit Standard 47.50mm for Honda CR85R 2003-2007 838M04750
WISECO
$134.95Upgrade your bike's performance with the WISECO Piston Kit designed for the CR 85. This high-quality standard piston ensures optimal engine efficiency and durability, allowing you to ride with confidence. Please note that this kit does not include a...09100323- SKU:
- 09100323
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 84,7 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
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 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
$254.95Qty in Cart: 0Quantity:Price:$254.95Subtotal: -
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
