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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VINTCO Top End Piston Kit KTY16-0.5
VINTCO
MSRP: $263.85$261.95Top End Piston Kit Includes a piston, rings, pin and clips, top end bearing and a full top-end gasket kit (head gasket, base gasket, intake gasket, and exhaust gasket)09106453- SKU:
- 09106453
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $263.85$261.95 -
VINTCO Top End Piston Kit KTY16-1.0
VINTCO
MSRP: $263.85$261.95Top End Piston Kit KTY16-1.0 Comprehensive kit includes piston, rings, pin, and clips for a complete overhaul. Top-end bearing ensures smooth operation and longevity of your engine. Full gasket kit includes head, base, intake, and exhaust...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$261.95Top End Piston Kit Includes a piston, rings, pin and clips, top end bearing and a full top-end gasket kit (head gasket, base gasket, intake gasket, and exhaust gasket)09106455- SKU:
- 09106455
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
MSRP: $263.85$261.95 -
WISECO Piston Kit - 54.00 mm - Yamaha 899M05400
WISECO
$129.95Piston Kit - 54.00 mm - Yamaha Designed for all-purpose 2-stroke riding, Durability, longevity and increased horsepower, Dedicated forging design for strength-to-weight optimization, Extra lightening operations for enhanced throttle response, Engineered,...09106456- SKU:
- 09106456
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
$129.95 -
Wiseco Piston Kit 54.00 mm Yamaha YZ125 2005-2021 846M05400
WISECO
$174.95Elevate your engine's performance with our premium 54.00 mm Piston Kit designed specifically for Yamaha models. Engineered for endurance and high RPM capabilities, this kit ensures maximum wear resistance and optimal power delivery, making it the perfect...09106458- SKU:
- 09106458
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
$174.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3050C
MOOSE RACING
$326.95Piston Kit - 77.00 mm - Kawasaki 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...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
$386.95Piston Kit - 77.00 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...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
$386.95Piston Kit - 96.00 mm - MPX3036 X-style forgings for superior strength and reduced friction. Full radius dome design enhances quench and prevents detonation. Internal bracing for increased durability and minimized friction in the pin...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
$471.95Piston Kit - 78.00 mm - Husqvarna | KTM - MPX9060C-P Enhances durability by reducing stresses in the pin bore area. Full radius dome design maximizes quench and eliminates hot spots. Internal bracing increases durability while minimizing...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
$471.95Piston Kit - 95.00 mm - Husqvarna 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...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
$386.95Piston Kit - 77.00 mm - Kawasaki 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...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
$386.95Piston Kit - 96.00 mm - MPX2180 Constructed with fully boxed-style forging for exceptional strength and reduced friction. Features full radius dome designs to enhance quenching and eliminate detonation hot spots. Internal bracing provides...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
$386.95Piston Kit - 96.00 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...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
$386.95Piston Kit - 96.00 mm - MPX3033 X-style forgings for enhanced strength and reduced friction Full radius dome design to maximize quench and prevent detonation Internal bracing for increased durability and minimized friction Includes wrist...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
$421.95Piston Kit - 96.00 mm - Kawasaki 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...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
$421.95Piston Kit - 96.00 mm - Honda 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...09106506- SKU:
- 09106506
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$421.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2084
MOOSE RACING
$386.95Piston Kit - 79.00 mm - MPX2084 X-style forgings for enhanced strength and reduced friction. Full radius dome design optimizes quench and reduces detonation risk. Internal bracing boosts durability and minimizes friction in the pin assembly...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
$516.95Piston Kit - 79.00 mm - Honda MPX2085-P Enhances durability by minimizing stresses in the pin bore area. Full radius dome design maximizes quench and eliminates detonation hot spots. Internal bracing increases durability while reducing friction in the...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
$386.95Piston Kit - 77.00 mm - Kawasaki 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...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
$421.95Piston Kit - 77.00 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...09106517- SKU:
- 09106517
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$421.95
