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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VINTCO Top End Piston Kit KTY16-1.0
VINTCO
MSRP: $263.85$261.95A worn top end compromises compression, power delivery, and fuel efficiency—forcing you to choose between a costly engine replacement or a proper rebuild. The VINTCO KTY16-1.0 gives you a complete, OEM-quality overhaul solution with precision-engineered...09106454- SKU:
- 09106454
- Availability:
- Ships Same Business Day
- Weight:
- 1.78 LBS
MSRP: $263.85$261.95 -
VINTCO Top End Piston Kit KTY16-1.5
VINTCO
MSRP: $263.85$261.95A worn or damaged top end is a performance killer—it compromises compression, increases blow-by, and accelerates wear on your cylinder. The VINTCO Top End Piston Kit KTY16-1.5 delivers a complete, OEM-quality solution with precision-engineered components...09106455- SKU:
- 09106455
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
MSRP: $263.85$261.95 -
On Sale
WISECO Piston Kit - 54.00 mm - Yamaha 899M05400
WISECO
MSRP: $155.95Now: $110.00Was: $155.95Stock pistons can't handle the demands of serious 2-stroke riding—they compromise on durability, throttle response, and peak horsepower. The WISECO 54.00 mm Piston Kit delivers a purpose-built solution with a dedicated forging design that optimizes...09106456- SKU:
- 09106456
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $155.95Now: $110.00Was: $155.95 -
On Sale
Wiseco Piston Kit 54.00 mm Yamaha YZ125 2005-2021 846M05400
WISECO
MSRP: $199.95Now: $149.00Was: $199.95Stock pistons can't handle the demands of high-RPM riding or extended racing seasons—wear, carbon buildup, and power loss follow. The Wiseco 54.00 mm Piston Kit for your Yamaha YZ125 (2005-2021) delivers the durability and compression consistency you...09106458- SKU:
- 09106458
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
MSRP: $199.95Now: $149.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $149.00Was: $199.95Subtotal: -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3050C
MOOSE RACING
$326.95When you're pushing your Kawasaki MPX3050C to the limit, factory pistons won't cut it. MOOSE Racing delivers a fully-forged piston kit engineered to handle extreme combustion pressures while shedding unnecessary weight and heat. This is the upgrade...09106491- SKU:
- 09106491
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$326.95 -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1090C
MOOSE RACING
$386.95Stock pistons are a limiting factor in any serious build—they fail under sustained high RPM, generate excessive heat, and rob you of power. MOOSE Racing's forged piston kit delivers the durability and precision you need to push your Yamaha MPX1090C...09106494- SKU:
- 09106494
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3036
MOOSE RACING
$386.95A high-performance piston kit is critical for maintaining reliability and maximizing power output in high-RPM applications. The MOOSE RACING MPX3036 delivers the strength and precision engineering necessary to handle sustained performance demands while...09106498- SKU:
- 09106498
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$386.95 -
MOOSE RACING Piston Kit - 78.00 mm - Husqvarna | KTM MPX9060C-P
MOOSE RACING
$471.95A piston kit is the heart of your engine's power delivery—when it fails, performance and reliability suffer dramatically. This MOOSE Racing 78mm piston kit is engineered to handle extreme combustion pressures while maintaining thermal efficiency, making...09106499- SKU:
- 09106499
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$471.95 -
MOOSE RACING Piston Kit - 95.00 mm - Husqvarna MPX9061-P
MOOSE RACING
$471.95When you're pushing your Husqvarna to its limits, piston durability becomes non-negotiable. This MOOSE Racing kit eliminates the weak points that cause failure under sustained high RPM and combustion stress, giving you the reliability to run consistent...09106500- SKU:
- 09106500
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$471.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3061
MOOSE RACING
$386.95If you're pushing your Kawasaki to the limit, a worn or marginal piston kit will cost you power, reliability, and ultimately race results. The MOOSE RACING 77.00 mm Piston Kit is engineered to withstand the demands of high-RPM racing while delivering...09106501- SKU:
- 09106501
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2180
MOOSE RACING
$386.95If you're building or rebuilding a high-revving Honda engine, piston durability and thermal stability are non-negotiable. This MOOSE RACING kit delivers the strength and precision needed to handle sustained boost and aggressive tuning without sacrificing...09106502- SKU:
- 09106502
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3030
MOOSE RACING
$386.95High-compression racing demands a piston engineered to withstand extreme pressures and temperatures without sacrificing responsiveness. The MOOSE RACING 96.00 mm Piston Kit delivers the durability and precision required for sustained performance, whether...09106503- SKU:
- 09106503
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3033
MOOSE RACING
$386.95A high-performance piston kit is essential for maintaining or upgrading your Kawasaki's top-end assembly—especially if you're running increased boost, higher RPMs, or simply want to restore your engine to factory-spec reliability. The MOOSE Racing...09106504- SKU:
- 09106504
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MPX3034
MOOSE RACING
$421.95When you're pushing your Kawasaki to the limit, stock pistons become your weakest link. The MOOSE RACING Piston Kit delivers the durability and thermal stability required for sustained high-RPM operation, with engineering specifically designed to...09106505- SKU:
- 09106505
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$421.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2181B
MOOSE RACING
$421.95High-rpm stability and longevity demand pistons engineered for extreme conditions—and MOOSE Racing delivers with fully forged construction that withstands detonation while shedding unnecessary weight. This 96.00 mm kit is designed for builders who refuse...09106506- SKU:
- 09106506
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$421.95Qty in Cart: 0Quantity:Price:$421.95Subtotal: -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2084
MOOSE RACING
$386.95If you're building a high-revving Honda engine or refreshing worn internals, a quality piston kit is non-negotiable. The MOOSE Racing MPX2084 delivers the strength and precision necessary to handle sustained boost or aggressive naturally aspirated...09106513- SKU:
- 09106513
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2085-P
MOOSE RACING
$516.95Honda high-performance engines demand pistons engineered to handle sustained combustion pressures and elevated RPM loads. The MOOSE RACING Piston Kit delivers the durability and thermal efficiency required for reliable power, whether you're pushing your...09106514- SKU:
- 09106514
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
$516.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3062
MOOSE RACING
$386.95When you're pushing your Kawasaki to the limit, stock pistons become your limiting factor. This MOOSE Racing piston kit delivers the strength and reliability needed for sustained high-RPM performance, while the advanced coating technologies and internal...09106515- SKU:
- 09106515
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1089
MOOSE RACING
$421.95If you're pushing your Yamaha to the limit, your stock piston won't cut it. This MOOSE Racing piston kit delivers the strength, reliability, and reduced friction needed to handle extreme conditions without sacrificing durability. Built with forged...09106517- SKU:
- 09106517
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$421.95 -
JE PISTONS Piston Kit 362954
JE PISTONS
$314.99Building a high-revving engine demands pistons engineered for the abuse that competition delivers. JE's 362954 kit combines precision forging with meticulous design to handle extreme boost, nitrous, and sustained RPM without compromise. When your...09106544- SKU:
- 09106544
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$314.99
