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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- Qty in Cart
- Quantity
- Price
- Subtotal
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JE PISTONS Piston Kit 362954
JE PISTONS
$299.99Piston Kit Machined from 2618-T6 high tensile forged aluminum, Dome/ dish features smooth flowing radii; require no deburring or preparation, JE designs are specifically engineered for extreme applications including professional competition, Pins, pin...09106544- SKU:
- 09106544
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$299.99 -
JE PISTONS Piston Kit 373034
JE PISTONS
$389.99Piston Kit 373034 Constructed from durable 2618-T6 high tensile forged aluminum for enhanced strength. Features a dome/dish design with smooth flowing radii for optimal performance. No deburring or preparation needed, ready for immediate...09106551- SKU:
- 09106551
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$389.99 -
JE PISTONS Piston Kit 373035
JE PISTONS
$389.99Piston Kit 373035 Constructed from durable 2618-T6 high tensile forged aluminum for enhanced strength. Features a dome/dish design with smooth flowing radii, eliminating the need for deburring. Engineered specifically for extreme...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
$326.95Piston Kit - 78.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...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
$326.95Piston Kit - 96.00 mm - MP2029 X-style forgings enhance strength and reduce friction. Designed for durability and optimal power output. Full radius dome design prevents hot spots, reducing detonation risks. Internal bracing improves...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
$421.95Piston Kit - 97.00 mm - Yamaha Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...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
$177.95Piston Kit - 77.00 mm - Kawasaki Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...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
$326.95Piston Kit - 96.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...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
$326.95Piston Kit - 66.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106468- SKU:
- 09106468
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal: -
MOOSE RACING Piston Kit - 96.00 mm - Kawasaki MP3009
MOOSE RACING
$125.95Piston Kit - 96.00 mm - MP3009 X-style forgings for enhanced strength and reduced friction. Designed for optimal durability, power, and weight reduction. Full radius dome designs promote efficient quenching and prevent detonation. ...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
$326.95Piston Kit - 96.00 mm - MP4027 X-style forgings provide exceptional strength and durability. Minimizes friction for enhanced performance and efficiency. Full radius dome designs optimize quench and reduce detonation risk. Internal...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
$326.95Piston Kit - 95.00 mm - Yamaha Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...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
$177.95Piston Kit - 96.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106479- SKU:
- 09106479
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
$177.95 -
MOOSE RACING Piston Kit - 95.00 mm - Yamaha MPX1026
MOOSE RACING
$386.95Piston Kit - 95.00 mm - Yamaha Feature fully boxed-style forging for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal...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
$209.95Piston Kit - 79.00 mm - MPX2082 X-style forgings for enhanced strength and performance. Minimizes friction, ensuring durability and power efficiency. Full radius dome designs optimize quench and reduce detonation risks. Internal bracing...09106518- SKU:
- 09106518
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$209.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2083A-P
MOOSE RACING
$516.95Piston Kit - 79.00 mm - Honda Pro Race Piston increases the durability by reducing the stresses in the pin bore area and allowing the pin to flex, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal...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
$177.95Piston Kit - 96.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, 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
$386.95Piston Kit - 97.00 mm - Yamaha Feature fully boxed-style forging for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal...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
$386.95Piston Kit - 96.00 mm - MPX2059 Engineered with fully boxed-style forging for superior strength and reduced friction. Features full radius dome designs to maximize quench and eliminate hot spots, preventing detonation. Internal bracing...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
$326.95Piston Kit - 77.00 mm - Suzuki Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106484- SKU:
- 09106484
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$326.95
