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
- Subtotal
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Wiseco Piston Kit Standard Yamaha YZ125 2005-2021 845M05400
WISECO
$143.95Your YZ125 piston is the foundation of engine reliability and power delivery—a worn or damaged unit tanks your throttle response and durability on the track. The Wiseco 845M05400 piston kit delivers precision-engineered construction with a tight...09100571- SKU:
- 09100571
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$143.95 -
Wiseco YZ85 2002-2018 Piston Kit with Gaskets PK1202
WISECO
$181.95The Wiseco PK1202 is engineered for YZ85 riders who demand reliable top-end performance without compromise. This complete piston kit delivers the precision bore diameter and optimized ring design necessary for consistent power delivery and throttle...09030299- SKU:
- 09030299
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$181.95Qty in Cart: 0Quantity:Price:$181.95Subtotal: -
On Sale
PROX Piston Kit - 71.94 mm - Gas Gas | Husqvarna | KTM 01.6388.A
PROX
MSRP: $189.95Now: $161.00Was: $189.95A piston kit is one of the most critical components in your engine's combustion chamber—it directly impacts power delivery, reliability, and longevity. The PROX 71.94 mm Piston Kit is engineered to OEM specifications using high-silicon-content aluminum...09106266- SKU:
- 09106266
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $189.95Now: $161.00Was: $189.95Qty in Cart: 0Quantity:Price:MSRP: $189.95Now: $161.00Was: $189.95Subtotal: -
VERTEX Top End Piston Kit - 66.35 mm - Yamaha YZ250/X VTK22584B-2
VERTEX
$235.95A worn top end compromises power delivery and throttle response on your YZ250/X. This VERTEX piston kit restores OEM performance with precision-cast components engineered for durability and reliable break-in, getting you back to riding with confidence...09103134- SKU:
- 09103134
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$235.95 -
VERTEX Piston Kit - 99.95 mm - KTM 23417B
VERTEX
$331.95A quality piston kit is the foundation of reliable engine performance, especially in high-demand racing and off-road applications. The VERTEX 99.95 mm piston kit delivers the durability and power gains your KTM engine needs, combining precision forging...09102627- SKU:
- 09102627
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
$331.95 -
On Sale
Wiseco Piston Kit 54.00 mm KTM 125 SX 2001-2024 RE904M05400
WISECO
MSRP: $221.95Now: $174.00Was: $221.95KTM 125 SX engines demand precision internals to handle the demands of competitive riding and high-RPM operation. This Wiseco piston kit delivers the durability and reliability you need to keep your engine running strong across multiple seasons without...09105086- SKU:
- 09105086
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit 68.50mm Yamaha YZ250 2002-2020 560M06850
WISECO
MSRP: $219.95Now: $170.00Was: $219.95The Wiseco 68.50mm piston kit restores your YZ250 to factory specifications while delivering the durability and compression needed for consistent high-RPM performance on the track or trail. Factory pistons wear out—this kit rebuilds your engine with...560M06850- SKU:
- 560M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $219.95Now: $170.00Was: $219.95Qty in Cart: 0Quantity:Price:MSRP: $219.95Now: $170.00Was: $219.95Subtotal: -
On Sale
Wiseco Piston Kit 95mm for KTM 520 EXC 2000-2002 PK1851
WISECO
MSRP: $403.95Now: $314.00Was: $403.95A worn or damaged piston kit will rob your KTM 520 EXC of power, efficiency, and reliability—especially if you're pushing hard on the track or trail. This Wiseco PK1851 kit gives you factory-matched components engineered for KTM's displacement and...09031162- SKU:
- 09031162
- Availability:
- Ships Same Business Day
- Weight:
- 1.84 LBS
MSRP: $403.95Now: $314.00Was: $403.95 -
On Sale
Wiseco Piston Kit 77.00mm Kawasaki KX250F 2006 13.5:1 Compression 4904M07700
WISECO
MSRP: $224.95Now: $191.00Was: $224.95A worn or damaged piston directly kills engine efficiency and can lead to catastrophic failure under load—especially critical for KX250F riders pushing their bikes hard on track or trail. Wiseco's forged piston kit delivers the precision engineering and...09101670- SKU:
- 09101670
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
MSRP: $224.95Now: $191.00Was: $224.95 -
On Sale
WISECO Piston Kit with Gaskets - 68.00 mm - Yamaha WR/YZ 250 PK1563
WISECO
MSRP: $275.95Now: $221.00Was: $275.95A worn or damaged top-end forces catastrophic engine failure and sidelined race time. The WISECO Piston Kit delivers OEM-quality reliability with precision-engineered components matched specifically to your Yamaha WR/YZ 250, ensuring consistent...09030716- SKU:
- 09030716
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $275.95Now: $221.00Was: $275.95 -
On Sale
Wiseco Piston Kit 95.00 mm Yamaha YFZ450R 2009-2019 RE819M09500
WISECO
MSRP: $243.95Now: $204.00Was: $243.95When you're running stock pistons in your YFZ450R, you're leaving horsepower on the table and risking catastrophic engine failure under sustained load or aggressive riding. The Wiseco 95.00 mm forged piston kit delivers the strength-to-weight ratio and...09100373- SKU:
- 09100373
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $243.95Now: $204.00Was: $243.95Qty in Cart: 0Quantity:Price:MSRP: $243.95Now: $204.00Was: $243.95Subtotal: -
On Sale
Wiseco Piston Kit 92.00 mm Honda XR500R 1983-1984 4330M09200
WISECO
MSRP: $239.95Now: $204.00Was: $239.95The OEM piston in your Honda XR500R experiences wear and heat stress that limits performance and reliability over time. A forged replacement kit restores compression, throttle response, and engine longevity while giving you the precision fit that factory...09102903- SKU:
- 09102903
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
MSRP: $239.95Now: $204.00Was: $239.95 -
On Sale
Wiseco Piston Kit 72.00 mm Suzuki TM250 1972-1975 380M07200
WISECO
MSRP: $224.95Now: $191.00Was: $224.95The stock piston in your Suzuki TM250 is a wear item—and when it fails, you're looking at catastrophic engine damage. This Wiseco piston kit replaces the entire upper-end assembly with forged high-silicon alloy components engineered for the demands of...380M07200- SKU:
- 380M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
Wossner Piston Kit 54.45mm Yamaha YZ125 1998-2001 8091D050
WOSSNER
$122.00Yamaha YZ125 owners pushing their machines at high RPM need a piston engineered to handle the demands of modern 2-stroke racing. The Wossner 54.45mm kit delivers the precision fit and durability required for both competitive track days and aggressive...09104816- SKU:
- 09104816
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
VINTCO Top End Piston Kit KTH01-00
VINTCO
$183.95A worn top end compromises both power output and engine reliability—this kit gives you everything needed for a complete rebuild in one box. Whether you're restoring a tired engine or upgrading after high-mileage use, the VINTCO KTH01-00 delivers...09106407- SKU:
- 09106407
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$183.95 -
VINTCO Top End Piston Kit KTH01-0.5
VINTCO
$198.85A worn top end compromises both power delivery and engine longevity—this complete piston kit restores OEM specifications while delivering the reliability demanded by serious builders and racers. The VINTCO KTH01-0.5 bundles everything needed for a proper...09106408- SKU:
- 09106408
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$198.85Qty in Cart: 0Quantity:Price:$198.85Subtotal: -
VINTCO Top End Piston Kit KTH01-1.0
VINTCO
$198.85A complete top-end rebuild requires precision-engineered components that work in concert—and this kit delivers all the critical parts in one package. Whether you're restoring lost compression, addressing wear on an existing engine, or building fresh...09106409- SKU:
- 09106409
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$198.85 -
VINTCO Top End Piston Kit KTH01-1.5
VINTCO
$198.85A top-end rebuild demands precision components and complete gasket coverage—this kit eliminates sourcing parts piecemeal and ensures your engine seals properly at every critical junction. Whether you're refreshing a high-mileage engine or preparing for...09106410- SKU:
- 09106410
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$198.85 -
VINTCO Top End Piston Kit KTH02-00
VINTCO
$188.85A complete top-end rebuild requires precision components that work in harmony—and this kit delivers all the critical parts in one box. Whether you're refreshing a worn engine or building a high-performance platform, having matched pistons, rings, and...09106411- SKU:
- 09106411
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
$188.85 -
VINTCO Top End Piston Kit KTH02-0.5
VINTCO
$188.85A worn or damaged top end is a reliability killer—and rebuilding with OEM-equivalent components ensures your engine performs at its peak without compromise. The VINTCO KTH02-0.5 gives you everything needed for a complete top-end refresh, eliminating the...09106412- SKU:
- 09106412
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$188.85
