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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On Sale
VINTCO Top End Piston Kit KTA05-1.0
VINTCO
MSRP: $260.85Now: $242.59Was: $260.85A worn or damaged top end compromises your engine's compression, efficiency, and reliability—exactly when you need peak performance. The VINTCO KTA05-1.0 delivers a complete rebuild solution with...09106434- SKU:
- 09106434
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
MSRP: $260.85Now: $242.59Was: $260.85 -
On Sale
VINTCO Top End Piston Kit KTA05-1.5
VINTCO
MSRP: $260.85Now: $242.59Was: $260.85A quality top-end rebuild is essential for maintaining peak power output and engine longevity. The VINTCO KTA05-1.5 delivers OEM-grade components in a complete kit, eliminating the hassle of sourcing...09106435- SKU:
- 09106435
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
MSRP: $260.85Now: $242.59Was: $260.85 -
On Sale
VINTCO Top End Piston Kit KTA06-00
VINTCO
MSRP: $214.95Now: $199.90Was: $214.95A complete top-end rebuild demands precision components that work in concert—mismatched or worn pistons compromise compression, reduce power output, and accelerate engine degradation. The VINTCO...09106436- SKU:
- 09106436
- Availability:
- Ships Same Business Day
- Weight:
- 1.66 LBS
MSRP: $214.95Now: $199.90Was: $214.95 -
On Sale
VINTCO Top End Piston Kit KTA06-0.5
VINTCO
MSRP: $261.85Now: $243.52Was: $261.85A worn or damaged top end doesn't just kill performance—it compromises reliability when you need it most. The VINTCO Top End Piston Kit KTA06-0.5 gives you OEM-quality components in a complete...09106437- SKU:
- 09106437
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
MSRP: $261.85Now: $243.52Was: $261.85 -
On Sale
VINTCO Top End Piston Kit KTA06-1.0
VINTCO
MSRP: $261.85Now: $243.52Was: $261.85A quality piston kit is fundamental to engine reliability and performance—whether you're rebuilding after wear or upgrading for increased output. The VINTCO KTA06-1.0 delivers a complete top-end...09106438- SKU:
- 09106438
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
MSRP: $261.85Now: $243.52Was: $261.85 -
On Sale
VINTCO Top End Piston Kit KTA06-1.5
VINTCO
MSRP: $214.95Now: $199.90Was: $214.95A top-end rebuild demands precision components that restore your engine to factory specifications—or exceed them. The VINTCO KTA06-1.5 delivers a complete piston assembly with matched rings and...09106439- SKU:
- 09106439
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
MSRP: $214.95Now: $199.90Was: $214.95 -
On Sale
VINTCO Top End Piston Kit KTS03-00
VINTCO
MSRP: $197.95Now: $184.09Was: $197.95A worn top end directly compromises compression, power delivery, and fuel efficiency—making piston and ring replacement one of the highest-ROI maintenance tasks you can perform. The VINTCO KTS03-00...09106440- SKU:
- 09106440
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $197.95Now: $184.09Was: $197.95Qty in Cart: 0Quantity:Price:MSRP: $197.95Now: $184.09Was: $197.95Subtotal: -
On Sale
VINTCO Top End Piston Kit KTS03-0.5
VINTCO
MSRP: $208.85Now: $194.23Was: $208.85A top-end rebuild demands precision components that work together seamlessly—the VINTCO KTS03-0.5 delivers exactly that. This complete piston kit eliminates the guesswork of sourcing individual parts...09106441- SKU:
- 09106441
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $208.85Now: $194.23Was: $208.85Qty in Cart: 0Quantity:Price:MSRP: $208.85Now: $194.23Was: $208.85Subtotal: -
On Sale
VINTCO Top End Piston Kit KTS03-1.0
VINTCO
MSRP: $208.85Now: $194.23Was: $208.85A worn top end compromises both power delivery and fuel efficiency—this complete piston kit restores your engine to factory specifications without the guesswork of sourcing individual components...09106442- SKU:
- 09106442
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $208.85Now: $194.23Was: $208.85 -
On Sale
VINTCO Top End Piston Kit KTS03-1.5
VINTCO
MSRP: $208.85Now: $194.23Was: $208.85A worn or damaged top end can rob your engine of compression, efficiency, and reliability. The VINTCO Top End Piston Kit KTS03-1.5 gives you a complete solution to restore—or upgrade—your engine's...09106443- SKU:
- 09106443
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $208.85Now: $194.23Was: $208.85 -
On Sale
VINTCO Top End Piston Kit KTS01-00
VINTCO
MSRP: $176.85Now: $164.47Was: $176.85A top-end rebuild demands precision components that won't compromise engine integrity or performance. The VINTCO KTS01-00 delivers everything needed in one complete kit—piston, rings, pin, clips,...09106444- SKU:
- 09106444
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $176.85Now: $164.47Was: $176.85 -
On Sale
VINTCO Top End Piston Kit KTS01-0.5
VINTCO
MSRP: $162.95Now: $151.54Was: $162.95A top-end rebuild demands precision components that won't compromise your engine's integrity or performance gains. The VINTCO KTS01-0.5 delivers a complete piston assembly with matched rings, clips,...09106445- SKU:
- 09106445
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $162.95Now: $151.54Was: $162.95 -
On Sale
VINTCO Top End Piston Kit KTS01-1.0
VINTCO
MSRP: $162.95Now: $151.54Was: $162.95A top-end rebuild demands precision components that restore compression, seal integrity, and engine reliability. The VINTCO Top End Piston Kit KTS01-1.0 delivers everything needed for a complete...09106446- SKU:
- 09106446
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
MSRP: $162.95Now: $151.54Was: $162.95 -
On Sale
VINTCO Top End Piston Kit KTS01-1.5
VINTCO
MSRP: $162.95Now: $151.54Was: $162.95A complete top-end rebuild demands precision components and reliable gasket sealing—this kit delivers both in one package. The VINTCO KTS01-1.5 eliminates the guesswork of sourcing individual parts...09106447- SKU:
- 09106447
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
MSRP: $162.95Now: $151.54Was: $162.95 -
On Sale
VINTCO Top End Piston Kit KTS02-00
VINTCO
MSRP: $188.85Now: $175.63Was: $188.85A quality top-end rebuild is essential for maintaining compression, ring seal, and combustion efficiency—especially if your engine has high mileage or sees regular track time. The VINTCO Top End...09106448- SKU:
- 09106448
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
MSRP: $188.85Now: $175.63Was: $188.85 -
On Sale
VINTCO Top End Piston Kit KTS02-0.5
VINTCO
MSRP: $188.85Now: $175.63Was: $188.85A worn top end doesn't just cost you power—it costs you reliability when it matters most. The VINTCO Top End Piston Kit KTS02-0.5 delivers a complete refresh with precision-machined components...09106449- SKU:
- 09106449
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
MSRP: $188.85Now: $175.63Was: $188.85 -
On Sale
VINTCO Top End Piston Kit KTS02-1.0
VINTCO
MSRP: $188.85Now: $175.63Was: $188.85A top-end rebuild is essential for restoring compression, reducing blow-by, and maximizing horsepower in high-mileage or performance engines. The VINTCO Top End Piston Kit KTS02-1.0 delivers a...09106450- SKU:
- 09106450
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
MSRP: $188.85Now: $175.63Was: $188.85 -
On Sale
VINTCO Top End Piston Kit KTS02-1.5
VINTCO
MSRP: $188.85Now: $175.63Was: $188.85A quality top-end rebuild is essential for restoring compression, sealing integrity, and combustion efficiency—especially after high-mileage operation or performance modifications. The VINTCO KTS02-1...09106451- SKU:
- 09106451
- Availability:
- Ships Same Business Day
- Weight:
- 1.02 LBS
MSRP: $188.85Now: $175.63Was: $188.85Qty in Cart: 0Quantity:Price:MSRP: $188.85Now: $175.63Was: $188.85Subtotal: -
On Sale
VINTCO Top End Piston Kit KTY16-00
VINTCO
MSRP: $263.85Now: $243.61Was: $261.95A top-end rebuild demands precision components that restore your engine's compression, sealing, and reliability—and this kit eliminates the guesswork by bundling everything you need in one package...09106452- SKU:
- 09106452
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
MSRP: $263.85Now: $243.61Was: $261.95 -
On Sale
VINTCO Top End Piston Kit KTY16-0.5
VINTCO
MSRP: $263.85Now: $243.61Was: $261.95A top-end rebuild is essential when your piston shows signs of wear, scoring, or blow-by—symptoms that compromise compression and power output. This complete VINTCO kit eliminates the need to source...09106453- SKU:
- 09106453
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $263.85Now: $243.61Was: $261.95
