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 222085
JE PISTONS
$269.99When you're pushing your engine to the absolute limit in competition, your pistons need to survive extreme pressures and temperatures without compromise. JE Pistons 222085 Pro Series delivers the precision engineering and material science that separates...09105849- SKU:
- 09105849
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- WALL THICKNESS:
- 0,120'
- DISPLACEMENT:
- 366 CC
- RIDING STYLE:
- ATV
- WALL THICKNESS IMPERIAL:
- 0.120'
$269.99Qty in Cart: 0Quantity:Price:$269.99Subtotal: -
JE PISTONS Piston Kit 222086
JE PISTONS
$309.99If you're building a competition engine that demands absolute reliability under extreme load, JE Pistons' Pro Series kit delivers the precision engineering required to survive professional racing environments. These forged-aluminum pistons are...09105850- SKU:
- 09105850
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- RIDING STYLE:
- ATV
- PISTON HEAD SHAPE:
- FLAT TOP
- WALL THICKNESS IMPERIAL:
- 0.160'
- UNITS:
- KIT
- BORE SIZE METRIC:
- 98.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 468 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
$309.99 -
JE PISTONS Piston Kit 222388
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition, your pistons need to deliver reliability without compromise. JE PISTONS' Pro Series 222388 kit is engineered for extreme racing applications, combining lightweight construction with...09105851- SKU:
- 09105851
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- DOMED
- BORE SIZE METRIC:
- 105.00 MM
- WALL THICKNESS:
- 0,150'
- WALL THICKNESS IMPERIAL:
- 0.150'
- DISPLACEMENT:
- 560 CC
- PRODUCT NAME:
- PISTON KIT
$309.99 -
JE PISTONS Piston Kit 247612
JE PISTONS
$309.99If you're building a competition engine that needs to survive extreme boost, high RPM, and sustained abuse, JE Pistons' Pro Series 247612 kit delivers the structural integrity and precision engineering required for professional-level racing. These forged...09105853- SKU:
- 09105853
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- JE PISTON
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE SIZE METRIC:
- 89.00 MM
- DISPLACEMENT:
- 435 CC
- BORE - OVERSIZE:
- +4,00 MM
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +4.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.8:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$309.99 -
JE PISTONS Piston Kit 247613
JE PISTONS
$325.99Built from 2618-T6 forged aluminum and engineered for extreme competition environments, these JE Pro Series pistons deliver the precision and durability professional racers demand. The internal and external bracing, combined with dedicated...09105854- SKU:
- 09105854
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- DISPLACEMENT:
- 449 CC
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- WALL THICKNESS:
- 0,160'
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
$325.99Qty in Cart: 0Quantity:Price:$325.99Subtotal: -
JE PISTONS Piston Kit 247614
JE PISTONS
$325.99When you're pushing your engine to the absolute limit in competition, your pistons need to withstand extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 247614 kit delivers the precision engineering and durability required for...09105855- SKU:
- 09105855
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- WALL THICKNESS:
- 0,160'
- PISTON HEAD SHAPE:
- DOMED
- WALL THICKNESS IMPERIAL:
- 0.160'
$325.99 -
JE PISTONS Piston Kit 247942
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition or extreme applications, stock pistons simply won't cut it. JE PISTONS' 247942 kit is engineered for professional-grade performance with a design that handles sustained high-load...09105859- SKU:
- 09105859
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- BORE SIZE METRIC:
- 98 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 478 CC
- TYPE:
- FORGED SIDE RELIEF DESIGN
- PISTON HEAD SHAPE:
- DISHED
- BORE - OVERSIZE:
- +3,00 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- JE PISTON
- UNITS:
- KIT
$309.99Qty in Cart: 0Quantity:Price:$309.99Subtotal: -
JE PISTONS Piston Kit 247952
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in professional competition, your pistons need to survive extreme combustion pressures and sustained high RPMs without compromise. JE Pistons' Pro Series kit delivers the precision engineering and...09105860- SKU:
- 09105860
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
- PISTON HEAD SHAPE:
- DISHED
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 478 CC
- BORE SIZE METRIC:
- 98.00 MM
- WALL THICKNESS:
- 0,160'
$309.99 -
JE PISTONS Piston Kit 247956
JE PISTONS
$309.99When you're pushing your engine to its limits in competition, your pistons need to match your commitment. JE Pistons 247956 kits are purpose-built from 2618-T6 forged aluminum—the same material trusted by professional racers—to handle extreme loads...09105861- SKU:
- 09105861
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
- BORE SIZE METRIC:
- 95.00 MM
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
$309.99 -
JE PISTONS Piston Kit 261555
JE PISTONS
$329.99When you're pushing an engine to its absolute limit in competition, stock pistons become a liability. JE's Pro Series 261555 kit delivers the precision engineering and durability demanded by professional racers and extreme-duty applications, with...09105871- SKU:
- 09105871
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 95.00 MM
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
$329.99 -
JE PISTONS Piston Kit 261966
JE PISTONS
$329.99When you're pushing your engine to the absolute limit in competition, factory pistons simply won't cut it. JE PISTONS' 261966 Kit delivers the precision engineering and structural integrity that professional racers demand, with 2618-T6 forged aluminum...09105872- SKU:
- 09105872
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
- UNITS:
- KIT
$329.99 -
JE PISTONS Piston Kit 262279
JE PISTONS
$325.99When you're pushing your engine to the limit in competition or high-performance applications, your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 262279 kit delivers the precision engineering and...09105873- SKU:
- 09105873
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 149 CC
- RIDING STYLE:
- OFF-ROAD
$325.99Qty in Cart: 0Quantity:Price:$325.99Subtotal: -
JE PISTONS Piston Kit 262283
JE PISTONS
$329.99When you're pushing your engine to the absolute limit in competition, your pistons need to be engineered for sustained extreme performance—not just peak power. JE PISTONS Pro Series delivers the internal and external bracing, precision weight reduction,...09105874- SKU:
- 09105874
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
- WALL THICKNESS IMPERIAL:
- 0.160'
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$329.99Qty in Cart: 0Quantity:Price:$329.99Subtotal: -
JE PISTONS Piston Kit 262284
JE PISTONS
$329.99When you're pushing your engine to the limit in competition, your pistons need to withstand extreme pressures and temperatures without compromise. JE Pistons' 262284 kit delivers the precision engineering and durability required for professional-grade...09105875- SKU:
- 09105875
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
- WALL THICKNESS IMPERIAL:
- 0.160'
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- DOMED
$329.99 -
JE PISTONS Piston Kit 262285
JE PISTONS
$309.99When you're pushing your engine to the limit in competition, your pistons need to handle extreme pressure, heat, and RPM without compromise. JE Pistons' Pro Series 262285 kit is engineered specifically for professional-grade racing applications,...09105876- SKU:
- 09105876
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
- BORE SIZE METRIC:
- 94.00 MM
- RIDING STYLE:
- ATV
- WALL THICKNESS:
- 0,150'
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS IMPERIAL:
- 0.150'
$309.99 -
JE PISTONS Piston Kit 262289
JE PISTONS
$329.99When you're pushing your engine to the absolute limit—whether on the track or in competition—your pistons need to handle extreme pressures without compromise. JE PISTONS' Pro Series 262289 kit delivers the durability and precision that professional...09105877- SKU:
- 09105877
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- WALL THICKNESS:
- 0,150'
- BORE SIZE METRIC:
- 102.00 MM
- DISPLACEMENT:
- 719 CC
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.150'
$329.99Qty in Cart: 0Quantity:Price:$329.99Subtotal: -
JE PISTONS Piston Kit 274177
JE PISTONS
$309.99When you're pushing your engine to the limit in competition, your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 274177 kit delivers the precision engineering and durability that professional racers...09105878- SKU:
- 09105878
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- DISPLACEMENT:
- 170 CC
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 70.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- BORE - OVERSIZE:
- +4,00 MM
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
$309.99 -
JE PISTONS Piston Kit 274178
JE PISTONS
$309.99When you're pushing your engine to the absolute limit, your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 274178 kit delivers the precision engineering and durability required for professional...09105879- SKU:
- 09105879
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$309.99Qty in Cart: 0Quantity:Price:$309.99Subtotal: -
JE PISTONS Piston Kit 274189
JE PISTONS
$346.99When you're pushing your engine to the absolute limit, your pistons need to match that intensity. JE PISTONS' Pro Series 274189 kit delivers the precision engineering and durability required for professional competition and extreme forced-induction...09105880- SKU:
- 09105880
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- DISPLACEMENT:
- 449 CC
- WALL THICKNESS:
- 0,160'
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
$346.99Qty in Cart: 0Quantity:Price:$346.99Subtotal: -
JE PISTONS Piston Kit 274190
JE PISTONS
$346.99When you're pushing your engine to the absolute limit in competition, factory pistons won't cut it—you need a piston kit engineered specifically for the extreme demands of professional racing. JE PISTONS 274190 delivers the precision, durability, and...09105881- SKU:
- 09105881
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- UNITS:
- KIT
- WALL THICKNESS IMPERIAL:
- 0.160'
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- PISTON KIT
- WALL THICKNESS:
- 0,160'
$346.99
