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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JE PISTONS Piston Kit 362954
JE PISTONS
$299.99Building 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
$299.99 -
JE PISTONS Piston Kit 373034
JE PISTONS
$389.99If you're building an engine for competition or extreme duty applications, piston quality directly impacts reliability and performance under peak loads. The JE PISTONS 373034 Kit delivers the strength and precision needed to withstand high RPM and...09106551- SKU:
- 09106551
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$389.99 -
JE PISTONS Piston Kit 373035
JE PISTONS
$389.99When you're pushing your engine to the limit in competition, stock pistons won't cut it. The JE Piston Kit 373035 is purpose-built for extreme applications where reliability and performance are non-negotiable—delivering the strength and precision you...09106552- SKU:
- 09106552
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
$389.99 -
MOOSE RACING Piston Kit - 78.00 mm - Honda MP2000C
MOOSE RACING
$326.95If you're pushing your Honda MP2000C to its limits, stock pistons become your weak point. The MOOSE RACING Piston Kit delivers the strength and precision you need to run aggressive boost levels and high RPMs without sacrificing reliability. Built with...09106465- SKU:
- 09106465
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2029
MOOSE RACING
$326.95A quality piston kit is fundamental to reliable engine performance and longevity. The MOOSE Racing MP2029 combines precision forging with thoughtful internal engineering to deliver consistent power output while resisting detonation and wear. Whether...09106467- SKU:
- 09106467
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal: -
MOOSE RACING Piston Kit - 97.00 mm - Yamaha MPX1111
MOOSE RACING
$421.95When you're pushing your Yamaha to the limit, a quality piston kit is non-negotiable. The MOOSE RACING 97.00 mm Piston Kit delivers the strength and precision needed for reliable high-RPM performance, with forged construction that resists detonation and...09106521- SKU:
- 09106521
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$421.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki M3023C
MOOSE RACING
$177.95If you're rebuilding a high-revving Kawasaki engine or looking to restore OEM performance, piston integrity is non-negotiable. The MOOSE RACING Piston Kit delivers forged strength and precision engineering to handle sustained power delivery without...09106470- SKU:
- 09106470
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2009
MOOSE RACING
$326.95High-performance pistons are critical to engine reliability under extreme conditions—cheap alternatives fail catastrophically. The MOOSE RACING Piston Kit delivers the strength and precision engineering required for sustained high-RPM operation, whether...09106466- SKU:
- 09106466
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95 -
MOOSE RACING Piston Kit - 66.00 mm - Honda MP2044C
MOOSE RACING
$326.95A quality piston kit is fundamental to engine reliability and performance—especially in high-demand racing applications where detonation and premature wear can cost you races. The MOOSE RACING MP2044C combines proven X-style forging technology with...09106468- SKU:
- 09106468
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MP3009
MOOSE RACING
$125.95The stock piston in your Kawasaki limits both power output and engine longevity—especially under sustained high-RPM riding or forced induction applications. This MOOSE Racing piston kit replaces those constraints with a precision-forged design that...09106471- SKU:
- 09106471
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MP4027
MOOSE RACING
$326.95A high-performance piston kit is critical for maintaining reliability and power output in demanding riding conditions. The MOOSE RACING MP4027 combines forged durability with precision engineering to deliver the strength and efficiency your Kawasaki...09106476- SKU:
- 09106476
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$326.95 -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MP1000
MOOSE RACING
$326.95A piston kit is the heart of your engine's combustion cycle—when it wears, power drops and reliability suffers. The MOOSE Racing 95.00 mm Piston Kit for Yamaha MP1000 engines combines forged strength with precision engineering to deliver consistent...09106477- SKU:
- 09106477
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2057
MOOSE RACING
$326.95A piston kit is the foundation of reliable engine performance, and the MOOSE RACING MP2057 delivers the precision engineering your Honda engine demands. Built with X-style forgings and full radius dome designs, this kit minimizes detonation risk while...09106479- SKU:
- 09106479
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$326.95 -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MPX1026
MOOSE RACING
$386.95When you're pushing your Yamaha to the limit, stock pistons become a liability. The MOOSE RACING Piston Kit delivers the strength, durability, and reduced friction you need to safely extract peak power without sacrificing reliability. Built with fully...09106488- SKU:
- 09106488
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2082
MOOSE RACING
$386.95Stock Honda pistons aren't engineered to handle sustained high-RPM loads or aggressive tuning—they'll degrade combustion efficiency and risk catastrophic failure. The MOOSE RACING MPX2082 piston kit replaces that weakness with forged strength and...09106518- SKU:
- 09106518
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2083A-P
MOOSE RACING
$516.95If you're running a high-rpm Honda engine, piston durability under extreme conditions separates a reliable build from a catastrophic failure. The MOOSE RACING Piston Kit is engineered to handle sustained performance loads by reducing stress concentration...09106519- SKU:
- 09106519
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$516.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2058
MOOSE RACING
$177.95When you're building or rebuilding a high-performance Honda engine, your piston choice directly impacts reliability, power output, and longevity under extreme conditions. MOOSE Racing pistons are engineered with forged construction and internal bracing...09106480- SKU:
- 09106480
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
MOOSE RACING Piston Kit - 97.00 mm - Yamaha MPX1068
MOOSE RACING
$386.95A piston kit is the core of your engine's combustion cycle, and choosing the right one directly impacts power output, reliability, and longevity. MOOSE Racing's fully forged 97.00 mm piston kit delivers the durability and thermal control needed for...09106483- SKU:
- 09106483
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
$386.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2059
MOOSE RACING
$386.95Stock Honda pistons weren't engineered for sustained high-RPM abuse or boost pressure—they'll give up when you push hard. This Moose Racing piston kit delivers the strength and thermal stability needed for serious performance builds, whether you're road...09106487- SKU:
- 09106487
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$386.95 -
MOOSE RACING Piston Kit - 77.00 mm - Suzuki MP3031C
MOOSE RACING
$326.95Stock pistons limit your engine's potential—they're engineered for longevity, not performance. The MOOSE RACING 77.00 mm Piston Kit delivers forged strength and precision geometry designed to withstand high-RPM abuse while reducing friction and weight...09106484- SKU:
- 09106484
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$326.95
