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!
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- Price
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MOOSE RACING Piston Kit - 57.95 mm - TXC-W 150 MSE24519B
MOOSE RACING
$206.95A piston kit is the heart of two-stroke engine reliability, and this MOOSE Racing unit delivers the durability you need for consistent performance across demanding riding conditions. The gravity-cast...09106549- SKU:
- 09106549
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$206.95 -
MOOSE RACING Piston Kit - 44.95 mm - Cobra 65 MSE24107AB
MOOSE RACING
$68.95A piston kit is the heart of your engine's combustion cycle—precision-engineered components that directly impact horsepower, reliability, and longevity. The MOOSE Racing Piston Kit for Cobra 65...09106547- SKU:
- 09106547
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$68.95 -
MOOSE RACING Piston Kit - 53.95 mm - YZ 125 MSE24570B
MOOSE RACING
$147.95A worn or damaged piston directly kills engine performance and reliability on your YZ 125. This MOOSE Racing Piston Kit restores compression, reduces blow-by, and ensures your top-end runs at peak...09106550- SKU:
- 09106550
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
$147.95 -
MOOSE RACING Piston Kit - 38.95 mm - Cobra 50 MSE24105B
MOOSE RACING
$63.95A quality piston kit is fundamental to reliable engine performance, especially in high-RPM applications where thermal stress and wear demand precision-engineered components. The MOOSE Racing Piston...09106546- SKU:
- 09106546
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$63.95Qty in Cart: 0Quantity:Price:$63.95Subtotal: -
On Sale
Wossner 55 mm Piston Kit for Yamaha YZ125 2022-2025 8321D100
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00When you're pushing a YZ125 to its limits, a worn or damaged piston compromises both power delivery and engine reliability. The Wossner 55 mm Piston Kit delivers the precision fit and aerospace-grade...09106617- SKU:
- 09106617
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 55.95 mm Yamaha YZ125 2022-2025 8321D200
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00Stock pistons wear quickly under racing conditions, compromising compression and throttle response. The Wossner 55.95 mm kit restores factory specifications with aerospace-grade materials and...09106618- SKU:
- 09106618
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 57.95mm Yamaha YZ125 2022-2023 8321D400
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00Stock pistons can't handle the demands of serious riding—especially in a high-revving 2-stroke like the YZ125. This Wossner kit delivers the precision engineering and durability you need to maintain...09106619- SKU:
- 09106619
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 71.94mm KTM 300 EXC 2006-2024 8327DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00When you're pushing your KTM 300 EXC to its limits, a worn or stock piston becomes a bottleneck to performance and reliability. The Wossner 71.94mm Piston Kit delivers measurable gains in power...09106620- SKU:
- 09106620
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 71.95mm KTM 300 EXC 2023 8327DB
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00If you're running a KTM 300 EXC, piston wear directly impacts throttle response, compression consistency, and overall engine longevity. This Wossner kit replaces worn components with aerospace-grade...09106621- SKU:
- 09106621
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 71.96mm Husqvarna TE 300i 2018-2023 8327DC
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity. The Wossner 71.96mm piston kit restores your Husqvarna TE 300i to factory performance...09106622- SKU:
- 09106622
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 46.95 mm KTM 85 SX 2003-2025 8328DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00Your KTM 85 SX demands a piston that can handle aggressive riding without sacrificing reliability—this Wossner kit delivers both. Factory-spec dimensions and aerospace-grade construction ensure your...09106623- SKU:
- 09106623
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 46.96mm KTM 85 SX 2003-2025 8328DB
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're running a KTM 85 SX, piston wear is inevitable—and it directly impacts compression, throttle response, and engine longevity. The Wössner 8328DB kit replaces your worn piston with a...09106624- SKU:
- 09106624
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 46.97mm KTM 85 SX 17/14 2003-2025 8328DC
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00The Wossner 46.97mm piston kit is engineered for KTM 85 SX riders who demand reliable top-end performance without compromise. This complete assembly eliminates guesswork by pairing a precision-forged...09106625- SKU:
- 09106625
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner 47.45mm Piston Kit for Yamaha YZ85 2002-2025 8330DA
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The Wossner 47.45mm Piston Kit delivers the reliability and precision your Yamaha YZ85 demands, whether you're preparing for competition or pushing through demanding trail conditions. Factory OEM...09106626- SKU:
- 09106626
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Piston Kit 47.46mm Yamaha YZ85 2002-2025 8330DB
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00Stock pistons wear out—especially in high-revving two-strokes like the YZ85. This Wossner piston kit delivers the precision fit and durability you need to maintain peak performance across the full...09106627- SKU:
- 09106627
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Piston Kit 47.47mm Yamaha YZ85 2002-2025 8330DC
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A worn or damaged piston directly undermines engine efficiency, reliability, and rideability—especially critical in the demanding environment of two-stroke racing. The Wossner 47.47mm Piston Kit...09106628- SKU:
- 09106628
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Piston Kit 73mm Bore Beta RR 300 2022-2024 8324DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00High-mileage and modified Beta RR 300 engines demand pistons engineered for reliability and consistent performance under sustained load. This Wössner piston kit delivers OEM-quality fitment with...09106629- SKU:
- 09106629
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 72.97 mm Beta RR 300 Enduro 2022-2026 8324DC
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00When you're pushing your Beta RR 300 to its limits, a worn or compromised piston compromises everything—throttle response, reliability, and race-day consistency. The Wossner 72.97 mm piston kit...09106631- SKU:
- 09106631
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 61.95mm Beta RR 200 2019-2025 8325DA
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or damaged piston directly kills engine performance—increased friction, power loss, and potential catastrophic failure are inevitable without replacement. The Wossner 61.95mm piston kit...09106632- SKU:
- 09106632
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Piston Kit 61.96mm Beta 200 RR 2019-2023 8325DB
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or stock piston limits your Beta 200 RR's potential, causing increased friction, noise, and power loss through the engine cycle. This Wossner piston kit restores efficiency and responsiveness...09106633- SKU:
- 09106633
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
MSRP: $142.00Now: $134.90Was: $142.00
