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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Wossner Piston Kit 51.95 mm Big Bore 105 cc 2021-2024 Gas Gas MC 85 8329DA
WOSSNER
$152.00Upgrade your engine's performance with our high-quality Piston Kit designed for 51.95 mm Big Bore 105 cc models by Gas Gas, Husqvarna, and KTM. Crafted from aerospace-grade aluminum alloy, this piston kit ensures durability and efficiency, providing a...09106846- SKU:
- 09106846
- Availability:
- Ships Same Business Day
- Weight:
- 6.05 LBS
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 52.45mm Kawasaki KX112 2022-2023 8322DA
WOSSNER
$112.00Upgrade your Kawasaki's performance with our premium 52.45 mm Piston Kit. Designed for enthusiasts, this kit offers a perfect blend of strength and lightweight construction, ensuring enhanced efficiency and reduced noise. Experience the difference with...09106847- SKU:
- 09106847
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$112.00 -
Wossner Piston Kit 53.95mm Yamaha YZ125 2022-2025 8321DA
WOSSNER
$142.00Piston Kit - 53.95 mm - 8331DA Upgrade your Yamaha engine with our premium Piston Kit, engineered for optimal performance and longevity. This kit combines advanced materials with precision engineering to deliver a smooth, efficient operation, making it...09106855- SKU:
- 09106855
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$142.00 -
JE PISTONS Piston Kit - 12.5:1 - Kawasaki 379937
JE PISTONS
$329.99Piston Kit - 12.5:1 - Kawasaki Machined 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...09106678- SKU:
- 09106678
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$329.99 -
JE PISTONS Piston Kit - 13.5:1 - Kawasaki 379938
JE PISTONS
$329.99Piston Kit - 13.5:1 - Kawasaki Machined 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...09106679- SKU:
- 09106679
- Availability:
- Ships Same Business Day
- Weight:
- 1.07 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$329.99 -
JE PISTONS Piston Kit - 14.5:1 - Kawasaki 391920
JE PISTONS
$301.06Piston Kit - 14.5:1 - Kawasaki Machined 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...09106680- SKU:
- 09106680
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$301.06 -
MOOSE RACING Piston Kit MX2045
MOOSE RACING
$386.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106482- SKU:
- 09106482
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$386.95Qty in Cart: 0Quantity:Price:$386.95Subtotal: -
MOOSE RACING Piston Kit MP4028
MOOSE RACING
$326.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106485- SKU:
- 09106485
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
$326.95 -
MOOSE RACING Piston Kit MPX1110
MOOSE RACING
$386.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106520- SKU:
- 09106520
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit MP2017
MOOSE RACING
$326.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106474- SKU:
- 09106474
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
$326.95 -
MOOSE RACING Piston Kit MP4010A
MOOSE RACING
$326.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106475- SKU:
- 09106475
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$326.95 -
MOOSE RACING Piston Kit MPX2010
MOOSE RACING
$386.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106486- SKU:
- 09106486
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$386.95 -
MOOSE RACING Piston Kit - 44.97 mm MSE23430CD
MOOSE RACING
$62.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09102717- SKU:
- 09102717
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.97 MM
- RIDING STYLE:
- OFF-ROAD
$62.95 -
MOOSE RACING Piston Kit - 71.94 mm MSE24244B
MOOSE RACING
$235.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09105953- SKU:
- 09105953
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$235.95 -
MOOSE RACING Piston Kit - 48.45 mm MSE23637B
MOOSE RACING
$158.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09105954- SKU:
- 09105954
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$158.95 -
MOOSE RACING Piston Kit - 57.95 mm MSE24101B
MOOSE RACING
$206.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09105956- SKU:
- 09105956
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 57.95 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$206.95 -
MOOSE RACING Piston Kit - 55.95 mm MSE23383A
MOOSE RACING
$131.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09102715- SKU:
- 09102715
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$131.95 -
MOOSE RACING Piston Kit - 66.35 mm MSE22584B
MOOSE RACING
$169.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09102684- SKU:
- 09102684
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$169.95 -
MOOSE RACING Piston Kit - 53.96 mm MSE22652B
MOOSE RACING
$170.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09102688- SKU:
- 09102688
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$170.95 -
WSM Piston Kit - Kawasaki 900 - +.5 mm 010-840-05K
WSM
$76.57Quality 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...01084005- SKU:
- 01084005
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MODEL:
- ORIGINAL
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 73.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$76.57
