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 aluminum alloy construction with 18% silicon resists...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 delivers gravity-cast construction with advanced coatings...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 efficiency without sacrificing longevity. The...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 Kit for Cobra 50 delivers gravity-cast construction with...09106546- SKU:
- 09106546
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$63.95 -
Wossner 55 mm Piston Kit for Yamaha YZ125 2022-2025 8321D100
WOSSNER
$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 construction you need to restore full performance or...09106617- SKU:
- 09106617
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$132.00 -
Wossner Piston Kit 55.95 mm Yamaha YZ125 2022-2025 8321D200
WOSSNER
$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 precision engineering, delivering reliable power across your...09106618- SKU:
- 09106618
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$152.00 -
Wossner Piston Kit 57.95mm Yamaha YZ125 2022-2023 8321D400
WOSSNER
$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 peak performance lap after lap, with reduced friction...09106619- SKU:
- 09106619
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$152.00 -
Wossner Piston Kit 71.94mm KTM 300 EXC 2006-2024 8327DA
WOSSNER
$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 delivery and durability through aerospace-grade construction...09106620- SKU:
- 09106620
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 71.95mm KTM 300 EXC 2023 8327DB
WOSSNER
$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 construction and a friction-reducing skirt coating,...09106621- SKU:
- 09106621
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 71.96mm Husqvarna TE 300i 2018-2023 8327DC
WOSSNER
$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 specifications while reducing friction losses and...09106622- SKU:
- 09106622
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$192.00 -
Wossner Piston Kit 46.95 mm KTM 85 SX 2003-2025 8328DA
WOSSNER
$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 engine maintains peak performance across the entire RPM...09106623- SKU:
- 09106623
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$132.00 -
Wossner Piston Kit 46.96mm KTM 85 SX 2003-2025 8328DB
WOSSNER
$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 precision-engineered unit that restores lost performance while...09106624- SKU:
- 09106624
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$132.00 -
Wossner Piston Kit 46.97mm KTM 85 SX 17/14 2003-2025 8328DC
WOSSNER
$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 piston with OEM-spec rings, pins, and...09106625- SKU:
- 09106625
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
$132.00 -
Wossner 47.45mm Piston Kit for Yamaha YZ85 2002-2025 8330DA
WOSSNER
$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 pistons wear faster and sacrifice performance under...09106626- SKU:
- 09106626
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
$122.00 -
Wossner Piston Kit 47.46mm Yamaha YZ85 2002-2025 8330DB
WOSSNER
$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 2002-2025 model range, while reducing friction and noise...09106627- SKU:
- 09106627
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Piston Kit 47.47mm Yamaha YZ85 2002-2025 8330DC
WOSSNER
$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 delivers OEM-equivalent fitment with measurable...09106628- SKU:
- 09106628
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
$122.00 -
Wossner Piston Kit 73mm Bore Beta RR 300 2022-2024 8324DA
WOSSNER
$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 aerospace-grade materials and a permanent skirt coating...09106629- SKU:
- 09106629
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
$192.00 -
Wossner Piston Kit 72.97 mm Beta RR 300 Enduro 2022-2026 8324DC
WOSSNER
$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 restores your engine to peak efficiency with aerospace-grade...09106631- SKU:
- 09106631
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
$192.00 -
Wossner Piston Kit 61.95mm Beta RR 200 2019-2025 8325DA
WOSSNER
$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 restores your Beta RR 200's combustion efficiency and...09106632- SKU:
- 09106632
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$142.00 -
Wossner Piston Kit 61.96mm Beta 200 RR 2019-2023 8325DB
WOSSNER
$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 with aerospace-grade materials and precision...09106633- SKU:
- 09106633
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
$142.00
