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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VERTEX Piston Kit - 76.95 mm - Kawasaki KX250F 24165A
VERTEX
$124.95Your KX250F's engine demands a piston that can handle the heat of competitive riding while maintaining the reliability you need for consistent performance. The VERTEX 76.95 mm Piston Kit delivers OEM-level durability with factory-engineered...09104669- SKU:
- 09104669
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$124.95Qty in Cart: 0Quantity:Price:$124.95Subtotal: -
On Sale
Wiseco Piston Kit 95.00 mm Yamaha YZ450F 2006-2009 4694M09500
WISECO
MSRP: $269.95Now: $229.00Was: $269.95If you're rebuilding your YZ450F or pushing higher RPMs on the track, a worn or damaged piston directly kills power and reliability. This Wiseco forged piston kit restores compression, improves throttle response, and delivers the durability needed for...09102919- SKU:
- 09102919
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $269.95Now: $229.00Was: $269.95Qty in Cart: 0Quantity:Price:MSRP: $269.95Now: $229.00Was: $269.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1099
MOOSE RACING
$386.95A quality piston kit is foundational to engine reliability and performance—especially when you're pushing your Yamaha to its limits. The MOOSE Racing MPX1099 delivers the durability and efficiency you need through precision forging and thoughtful...09106516- SKU:
- 09106516
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95Qty in Cart: 0Quantity:Price:$386.95Subtotal: -
On Sale
Wiseco Piston Kit 95.00 mm 12.75:1 Compression Ratio for 2014-2022 Husqvarna FC450 40297M09500
WISECO
MSRP: $288.95Now: $217.00Was: $288.95When you're pushing your FC450 to its limits, stock pistons won't cut it. This Wiseco forged piston kit delivers the strength, precision tolerances, and reliability demanded by serious 4-stroke riders—whether you're attacking the track or tackling...09106542- SKU:
- 09106542
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $288.95Now: $217.00Was: $288.95Qty in Cart: 0Quantity:Price:MSRP: $288.95Now: $217.00Was: $288.95Subtotal: -
JE PISTONS Piston Kit 362953
JE PISTONS
$299.99When you're running professional-grade power, your pistons need to match that commitment. The JE PISTONS 362953 kit is engineered for extreme applications where reliability and performance aren't negotiable—it delivers the strength and precision required...09106543- SKU:
- 09106543
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
$299.99Qty in Cart: 0Quantity:Price:$299.99Subtotal: -
MOOSE RACING Piston Kit - 96.00 mm - Suzuki MP3020
MOOSE RACING
$326.95A quality piston kit is fundamental to reliable top-end performance, and this MOOSE Racing unit delivers the precision and durability that serious builders demand. The X-style forging process provides exceptional strength while keeping reciprocating mass...09106469- SKU:
- 09106469
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MP1034C
MOOSE RACING
$125.95A worn or compromised piston directly limits your engine's ability to maintain compression, power output, and reliability—especially under forced induction or high-RPM racing conditions. The MOOSE RACING 77.00 mm Piston Kit delivers forged strength and...09106472- SKU:
- 09106472
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MP1011
MOOSE RACING
$125.95If you're pushing your Yamaha MP1011 engine to its limits, stock pistons won't cut it. The MOOSE RACING Piston Kit delivers the strength, precision, and durability required for sustained high-performance operation, whether you're on the track or in the...09106473- SKU:
- 09106473
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 97.00 mm - Can-Am MP9014
MOOSE RACING
$125.95A worn or damaged piston directly undermines engine efficiency, responsiveness, and longevity. The MOOSE RACING Piston Kit delivers OEM-quality reliability with forged construction designed to handle sustained high-RPM performance while reducing...09106478- SKU:
- 09106478
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 72.96 mm - Xtrainer 300 MSE24569B
MOOSE RACING
$218.95A piston kit is the heart of your engine's combustion cycle—when it fails or wears, your power output and reliability suffer. The MOOSE Racing 72.96 mm Piston Kit delivers OEM-quality construction with proven durability upgrades, ensuring consistent...09106545- SKU:
- 09106545
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$218.95Qty in Cart: 0Quantity:Price:$218.95Subtotal: -
Wossner Piston Kit 72.96mm Beta 300 RR 2022-2026 8324DB
WOSSNER
$192.00OEM pistons wear out, but a quality replacement kit restores lost compression and throttle response while preventing catastrophic engine failure. The Wossner 72.96mm piston kit for your Beta 300 RR delivers the precision engineering and durability you...09106630- SKU:
- 09106630
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
$192.00 -
On Sale
PROX Piston Kit - 77.96 mm - Kawasaki KX250/KX250X 01.4351.A
PROX
MSRP: $188.95Now: $158.00Was: $188.95A worn or damaged piston directly compromises your KX250/KX250X's compression, throttle response, and overall reliability. The PROX 77.96 mm Piston Kit restores factory performance specifications with OEM-grade components, ensuring your engine runs at...09106786- SKU:
- 09106786
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $188.95Now: $158.00Was: $188.95 -
On Sale
PROX Piston Kit - 71.94 mm - Beta 01.7398.A
PROX
MSRP: $221.95Now: $170.00Was: $221.95When your piston fails, engine performance tanks—and so does your race day. The PROX Piston Kit delivers OEM-equivalent reliability with CNC precision, ensuring consistent compression, proper ring seal, and the durability needed for sustained high-RPM...09106807- SKU:
- 09106807
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
MSRP: $221.95Now: $170.00Was: $221.95 -
VERTEX Top End Piston Kit - 66.35 mm - Gas Gas | Husqvarna | KTM VTK23630B-3
VERTEX
$307.95When your top end starts showing signs of wear—whether it's lost compression, increased blow-by, or sluggish throttle response—a quality piston kit is essential to restore your bike's original performance and reliability. The VERTEX Top End Piston Kit...09106822- SKU:
- 09106822
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95 -
WOSSNER Piston Kit - 53.95 mm - Yamaha 8321DA
WOSSNER
$132.00High-revving engines demand pistons engineered for precision and durability. WOSSNER's aerospace-grade forged construction delivers the strength needed for sustained performance while their permanent skirt coating minimizes friction and piston...09106837- SKU:
- 09106837
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
Wossner Piston Kit 94.95 mm Husqvarna FC450 2023-2024 4097DA
WOSSNER
$214.00When your FC450 demands peak performance, a worn or stock piston becomes your limiting factor. The Wossner 94.95 mm Piston Kit delivers the precision engineering and durability required to sustain high RPMs and aggressive riding conditions while reducing...09106845- SKU:
- 09106845
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$214.00 -
MOOSE RACING Piston Kit MX1026
MOOSE RACING
$0.00If you're pushing your engine to the limit, a stock piston won't cut it—especially under sustained high RPM or forced induction. The MOOSE RACING Piston Kit MX1026 is engineered to handle extreme conditions with forgings designed to reduce stress...9106488- SKU:
- 9106488
- Availability:
- Ships Same Business Day
- Weight:
- 18.40 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2082
MOOSE RACING
$0.00When you're pushing your engine to its limits, stock pistons simply won't cut it. The MOOSE RACING Piston Kit MPX2082 delivers race-proven durability and reduced friction through precision X-style and fully boxed forgings, engineered to handle extreme...9106518- SKU:
- 9106518
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2083A-P
MOOSE RACING
$0.00If you're pushing your engine to its limits, stock pistons won't cut it. The MOOSE RACING Piston Kit MPX2083A-P is engineered with X-style and fully-boxed race forgings that deliver the strength, durability, and power reduction you need for sustained...9106519- SKU:
- 9106519
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2059
MOOSE RACING
$0.00Whether you're chasing lap records or rebuilding after a catastrophic failure, piston reliability is non-negotiable. The MOOSE RACING Piston Kit MPX2059 combines race-proven forging technology with precision engineering to handle extreme combustion...9106487- SKU:
- 9106487
- Availability:
- Ships Same Business Day
- Weight:
- 17.60 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal:
