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!
- Product
- Qty in Cart
- Quantity
- Price
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VINTCO Top End Piston Kit KTA05-1.0
VINTCO
$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 OEM-quality components that restore your engine to factory...09106434- SKU:
- 09106434
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
$260.85 -
VINTCO Top End Piston Kit KTA05-1.5
VINTCO
$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 individual parts and ensuring proper fitment across...09106435- SKU:
- 09106435
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
$260.85 -
VINTCO Top End Piston Kit KTA06-00
VINTCO
$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 KTA06-00 delivers a fully coordinated piston kit with...09106436- SKU:
- 09106436
- Availability:
- Ships Same Business Day
- Weight:
- 1.66 LBS
$214.95 -
VINTCO Top End Piston Kit KTA06-0.5
VINTCO
$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 package, eliminating the guesswork of sourcing individual...09106437- SKU:
- 09106437
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
$261.85 -
VINTCO Top End Piston Kit KTA06-1.0
VINTCO
$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 solution with matched components engineered to work...09106438- SKU:
- 09106438
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
$261.85 -
VINTCO Top End Piston Kit KTA06-1.5
VINTCO
$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 gasket kit, eliminating guesswork and compatibility issues...09106439- SKU:
- 09106439
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
$214.95 -
VINTCO Top End Piston Kit KTS03-00
VINTCO
$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 delivers everything needed for a complete top-end...09106440- SKU:
- 09106440
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$197.95 -
VINTCO Top End Piston Kit KTS03-0.5
VINTCO
$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 separately, ensuring proper clearances and ring...09106441- SKU:
- 09106441
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$208.85Qty in Cart: 0Quantity:Price:$208.85Subtotal: -
VINTCO Top End Piston Kit KTS03-1.0
VINTCO
$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. VINTCO's KTS03-1.0 includes everything needed for a proper...09106442- SKU:
- 09106442
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$208.85 -
VINTCO Top End Piston Kit KTS03-1.5
VINTCO
$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 breathing and combustion dynamics without sourcing...09106443- SKU:
- 09106443
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$208.85 -
VINTCO Top End Piston Kit KTS01-00
VINTCO
$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, bearing, and full gasket set—eliminating the guesswork and...09106444- SKU:
- 09106444
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$176.85 -
VINTCO Top End Piston Kit KTS01-0.5
VINTCO
$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, and bearings—eliminating guesswork and compatibility...09106445- SKU:
- 09106445
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$162.95 -
VINTCO Top End Piston Kit KTS01-1.0
VINTCO
$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 refresh in one package, eliminating the guesswork of...09106446- SKU:
- 09106446
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$162.95 -
VINTCO Top End Piston Kit KTS01-1.5
VINTCO
$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 by bundling a high-quality piston assembly with a full...09106447- SKU:
- 09106447
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$162.95 -
VINTCO Top End Piston Kit KTS02-00
VINTCO
$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 Piston Kit KTS02-00 delivers everything you need in one...09106448- SKU:
- 09106448
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
$188.85 -
VINTCO Top End Piston Kit KTS02-0.5
VINTCO
$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 engineered to restore compression, seal integrity, and...09106449- SKU:
- 09106449
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$188.85 -
VINTCO Top End Piston Kit KTS02-1.0
VINTCO
$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 complete solution with OEM-quality components, eliminating...09106450- SKU:
- 09106450
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$188.85 -
VINTCO Top End Piston Kit KTS02-1.5
VINTCO
$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 KTS02-1.5 delivers a complete solution with OEM-level...09106451- SKU:
- 09106451
- Availability:
- Ships Same Business Day
- Weight:
- 1.02 LBS
$188.85 -
VINTCO Top End Piston Kit KTY16-00
VINTCO
MSRP: $263.85$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. Whether you're addressing worn compression or completing...09106452- SKU:
- 09106452
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
MSRP: $263.85$261.95 -
VINTCO Top End Piston Kit KTY16-0.5
VINTCO
MSRP: $263.85$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 individual components separately, ensuring proper...09106453- SKU:
- 09106453
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $263.85$261.95
