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
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VINTCO Top End Piston Kit KTH02-1.5
VINTCO
$185.95A worn or damaged top end is the silent killer of engine performance—excessive blow-by, lost compression, and oil consumption are your first warning signs. This VINTCO Top End Piston Kit delivers everything you need for a complete top-end refresh in one...09106414- SKU:
- 09106414
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
$185.95Qty in Cart: 0Quantity:Price:$185.95Subtotal: -
VINTCO Top End Piston Kit KTH03-00
VINTCO
$195.85A worn or damaged top end compromises combustion efficiency and reliability—this comprehensive piston kit delivers everything needed for a complete, properly-sealed rebuild. Whether you're recovering from bearing wear or preparing a fresh build, the...09106415- SKU:
- 09106415
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
$195.85 -
VINTCO Top End Piston Kit KTH03-0.5
VINTCO
$195.85A worn or damaged top end doesn't just cost you performance—it costs you reliability on the track or trail. The VINTCO Top End Piston Kit KTH03-0.5 gives you a complete solution with OEM-quality components, eliminating the guesswork of sourcing...09106416- SKU:
- 09106416
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$195.85 -
VINTCO Top End Piston Kit KTH03-1.0
VINTCO
$195.85A worn top end compromises combustion efficiency, power delivery, and engine longevity. The VINTCO KTH03-1.0 delivers a complete piston assembly with precision-machined components and matched gasket set, eliminating the guesswork and sourcing hassle of...09106417- SKU:
- 09106417
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$195.85 -
VINTCO Top End Piston Kit KTH03-1.5
VINTCO
$195.85A complete top-end rebuild starts with the right components, and the VINTCO KTH03-1.5 delivers everything you need in one kit. Whether you're refreshing a tired engine or preparing for race season, this piston kit eliminates the hassle of sourcing...09106418- SKU:
- 09106418
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$195.85 -
VINTCO Top End Piston Kit KTH06-00
VINTCO
$220.85A top-end rebuild demands precision components that restore compression, seal integrity, and reliable performance. The VINTCO KTH06-00 delivers a complete piston kit with all critical gaskets and hardware, eliminating the risk of sourcing mismatched...09106419- SKU:
- 09106419
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
$220.85 -
VINTCO Top End Piston Kit KTH06-0.5
VINTCO
$220.85A top-end rebuild demands precision components and a complete gasket set—anything less risks compression loss, oil seepage, and premature wear. The VINTCO KTH06-0.5 delivers everything needed for a thorough, reliable rebuild in one kit, eliminating the...09106420- SKU:
- 09106420
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
$220.85 -
VINTCO Top End Piston Kit KTH06-1.0
VINTCO
$220.85A top-end rebuild demands precision components that restore compression and reliability without compromise. The VINTCO KTH06-1.0 delivers a complete piston assembly with matched rings, pin, and clips—eliminating the guesswork of sourcing individual...09106421- SKU:
- 09106421
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
$220.85 -
VINTCO Top End Piston Kit KTH06-1.5
VINTCO
$220.85A worn or damaged top end compromises engine efficiency, power delivery, and component longevity. The VINTCO KTH06-1.5 delivers a complete, ready-to-install solution that restores your engine to factory specifications or beyond. This all-in-one kit...09106422- SKU:
- 09106422
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
$220.85 -
VINTCO Top End Piston Kit KTH08-00
VINTCO
$218.85A quality top-end rebuild requires precision components that work together seamlessly—mismatched parts lead to poor sealing, inefficient combustion, and premature wear. The VINTCO KTH08-00 eliminates guesswork by bundling all essential components into...09106423- SKU:
- 09106423
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$218.85Qty in Cart: 0Quantity:Price:$218.85Subtotal: -
VINTCO Top End Piston Kit KTH10-00
VINTCO
$146.85A top-end rebuild demands precision components that work in concert—piston-to-ring sealing, bearing clearances, and gasket integrity all factor into whether your engine runs efficiently or hemorrhages compression and oil. The VINTCO KTH10-00 consolidates...09106424- SKU:
- 09106424
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
$146.85 -
VINTCO Top End Piston Kit KTH10-0.5
VINTCO
$146.85A complete top-end rebuild starts with the right piston kit. The VINTCO KTH10-0.5 gives you everything needed for a proper restoration—precision-engineered piston, rings, and a full gasket set—eliminating the guesswork of sourcing components individually...09106425- SKU:
- 09106425
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
$146.85 -
VINTCO Top End Piston Kit KTH10-1.0
VINTCO
$146.85A worn or damaged top end will tank your engine's compression, power delivery, and reliability. This complete piston kit from VINTCO gives you everything needed for a proper top-end rebuild—piston, rings, bearings, and all gaskets—eliminating the...09106426- SKU:
- 09106426
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
$146.85 -
VINTCO Top End Piston Kit KTH10-1.5
VINTCO
$146.85A worn or damaged top end dramatically reduces engine efficiency and reliability. The VINTCO Top End Piston Kit KTH10-1.5 provides everything needed for a complete, factory-quality top end rebuild in one package—eliminating the guesswork of sourcing...09106427- SKU:
- 09106427
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
$146.85Qty in Cart: 0Quantity:Price:$146.85Subtotal: -
VINTCO Top End Piston Kit KTA03-00
VINTCO
$206.95A worn top end can silently rob your engine of efficiency, compression, and reliability—especially under sustained high-rpm operation. The VINTCO KTA03-00 delivers a complete, OEM-quality rebuild solution with matched components engineered to restore...09106428- SKU:
- 09106428
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
$206.95 -
VINTCO Top End Piston Kit KTA03-0.5
VINTCO
$250.85A worn or damaged top end severely compromises engine performance, compression, and reliability. The VINTCO Top End Piston Kit KTA03-0.5 delivers a complete solution with precision-engineered components that restore your engine to factory...09106429- SKU:
- 09106429
- Availability:
- Ships Same Business Day
- Weight:
- 1.66 LBS
$250.85 -
VINTCO Top End Piston Kit KTA03-1.0
VINTCO
$250.85A top-end rebuild demands precision components that won't compromise your engine's integrity or performance gains. The VINTCO KTA03-1.0 delivers a complete piston assembly with matched rings, bearings, and gaskets—eliminating the guesswork of sourcing...09106430- SKU:
- 09106430
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
$250.85 -
VINTCO Top End Piston Kit KTA03-1.5
VINTCO
$250.75A top-end rebuild demands precision components and complete gasket coverage—this kit eliminates the guesswork by bundling everything you need in one package. Whether you're restoring compression after extended track use or refreshing a tired engine, the...09106431- SKU:
- 09106431
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
$250.75 -
VINTCO Top End Piston Kit KTA05-00
VINTCO
$260.85A top-end rebuild demands precision components that work together seamlessly—and this kit eliminates the guesswork by bundling everything you need in one package. Whether you're refreshing a worn engine or maximizing performance after high-mileage use,...09106432- SKU:
- 09106432
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
$260.85 -
VINTCO Top End Piston Kit KTA05-0.5
VINTCO
$260.85A complete top-end rebuild requires precision-matched components that work together seamlessly—mismatched or worn parts lead to compression loss, blow-by, and catastrophic failure. The VINTCO Top End Piston Kit KTA05-0.5 eliminates guesswork by...09106433- SKU:
- 09106433
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
$260.85
