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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- Price
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VERTEX Top End Piston Kit - 71.925 mm - Gas Gas | Husqvarna | KTM VTK24244A-1
VERTEX
$336.95When your two-stroke top end reaches the end of its service life, a quality piston kit is the foundation of reliable performance and longevity. The VERTEX Top End Piston Kit delivers OEM-equivalent quality with factory-grade durability, ensuring...09106818- SKU:
- 09106818
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$336.95 -
VERTEX Top End Piston Kit - 71.935 mm - Gas Gas | Husqvarna | KTM VTK24244B-1
VERTEX
$336.95When your top end wears out, you need a piston kit that matches OE specifications without compromise. The VERTEX VTK24244B-1 delivers reliable performance with factory-equivalent geometry and a Molybdenum Disulphite-coated skirt that reduces friction...09106819- SKU:
- 09106819
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$336.95 -
VERTEX Top End Piston Kit - 71.945 mm - Gas Gas | Husqvarna | KTM VTK24244C-1
VERTEX
$336.95A properly functioning top end is critical to maintaining peak engine performance and reliability in your two-stroke. The VERTEX Top End Piston Kit delivers OEM-quality construction with factory-standard fitment for Gas Gas, Husqvarna, and KTM platforms,...09106820- SKU:
- 09106820
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
$336.95Qty in Cart: 0Quantity:Price:$336.95Subtotal: -
VERTEX Top End Piston Kit - 66.34 mm - Gas Gas | Husqvarna | KTM VTK23630A-3
VERTEX
$307.95When your top end is worn, you need a piston kit that restores OE reliability without compromise. The VERTEX VTK23630A-3 delivers factory-spec performance with enhanced durability features—ideal for riders who demand dependable power delivery across the...09106821- SKU:
- 09106821
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
JE PISTONS Piston Kit - 95.00 mm - Gas Gas | Husqvarna | KTM 393215
JE PISTONS
$329.99Whether you're rebuilding after a top-end overhaul or upgrading to tighter tolerances, a quality piston kit is non-negotiable for reliable power delivery and engine longevity. JE Pistons delivers the precision engineering your Gas Gas, Husqvarna, or KTM...09106852- SKU:
- 09106852
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$329.99 -
JE PISTONS Pisotn Kit - 95.00 mm - Gas Gas | Husqvarna | KTM 393216
JE PISTONS
$329.99A high-performance piston kit is fundamental to engine reliability and power delivery in demanding off-road conditions. JE Pistons' 95.00 mm kit delivers the precision tolerances and material strength required for consistent combustion, whether you're...09106853- SKU:
- 09106853
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$329.99 -
JE PISTONS Piston Kit - 95.00 mm - Kawasaki 395091
JE PISTONS
$424.99When you're pushing your Kawasaki to its limits, stock pistons become your bottleneck. JE Pistons' 95.00 mm kit delivers the precision engineering and durability required for sustained high-RPM performance, whether you're on the track or maximizing...09106850- SKU:
- 09106850
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$424.99 -
JE PISTONS Piston Kit - 95.00 mm - Kawasaki 395092
JE PISTONS
$424.99If you're pushing your Kawasaki engine to its limits, factory pistons won't cut it. JE Pistons' 95.00 mm kit is engineered with 2618-T6 forged aluminum—the same material trusted in professional racing—to handle sustained high RPM operation, improve...09106851- SKU:
- 09106851
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$424.99 -
JE PISTONS Piston Kit - 97.00 mm - Yamaha 393217
JE PISTONS
$424.99High-performance racing demands pistons engineered for extreme cylinder pressures and sustained RPM levels—and the JE PISTONS 97.00mm kit delivers exactly that. Machined from 2618-T6 high tensile forged aluminum, these pistons provide the...09106854- SKU:
- 09106854
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
$424.99 -
Wossner Piston Kit 94.95 mm for 2024-2025 Gas Gas EC 450F 2023-2025 KTM 450 XCF-W 4070DA
WOSSNER
$214.00Stock pistons wear out and lose compression, killing your engine's responsiveness and efficiency. This Wossner piston kit restores peak performance with aerospace-grade materials and precision engineering—keeping your 450F or 450 XCF-W running strong...09106834- SKU:
- 09106834
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$214.00 -
Wossner Piston Kit 80.95mm KTM SX-F250 2023-2024 4077DA
WOSSNER
$204.00Factory pistons wear out, and when they do, your engine performance takes a hit. This Wossner kit delivers OEM-quality replacement with measurable improvements in ring sealing, friction reduction, and throttle response. If you're rebuilding your...09106835- SKU:
- 09106835
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$204.00 -
Wossner Piston Kit 80.95 mm KTM 250 SX-F 2023-2025 4090DA
WOSSNER
$244.00The stock piston in your KTM 250 SX-F is a wear item—and when it starts to go, engine performance degrades fast. Wossner's 80.95 mm piston kit restores full power delivery while improving durability and reducing friction losses, making it the ideal...09106836- SKU:
- 09106836
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$244.00Qty in Cart: 0Quantity:Price:$244.00Subtotal: -
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2025 4085DA
WOSSNER
$224.00When your YZ450F's original piston wears down, power delivery suffers and engine noise increases. The Wossner 96.96mm piston kit restores—and exceeds—OEM performance with aerospace-grade materials and precision engineering designed specifically for your...09106838- SKU:
- 09106838
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$224.00 -
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2026 4086DA
WOSSNER
$244.00If you're rebuilding your YZ450F or pushing higher RPMs, piston wear directly impacts your engine's reliability and power delivery. Wossner's 96.96mm kit delivers the precision fit and durability you need to maximize performance without compromising...09106839- SKU:
- 09106839
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$244.00 -
Wossner 95.95mm Piston Kit for Kawasaki KX450F 2016-2018 4087DA
WOSSNER
$224.00A quality piston kit is foundational to engine reliability and performance—especially on high-demand applications like the KX450F. Worn or substandard pistons create ring blow-by, increased friction, and power loss. The Wossner 95.95mm Piston Kit...09106840- SKU:
- 09106840
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$224.00Qty in Cart: 0Quantity:Price:$224.00Subtotal: -
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4092DA
WOSSNER
$224.00Stock pistons in your YZ450F are engineered for durability, not peak performance—and they show it through higher operating temperatures and reduced power output. The Wossner 96.96 mm Piston Kit replaces factory internals with aerospace-grade forgings...09106841- SKU:
- 09106841
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$224.00 -
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4093DA
WOSSNER
$244.00High-mileage YZ450F engines suffer from increased piston rock and friction, which directly impact throttle response and reliability on the track. This Wossner piston kit restores OEM-spec compression geometry while reducing ring blow-by and noise, giving...09106842- SKU:
- 09106842
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$244.00 -
Wossner Piston Kit 87.95 mm KTM 350 2023-2025 4091DA
WOSSNER
$214.00Factory pistons wear, lose compression, and compromise your bike's throttle response. The Wossner 87.95 mm piston kit restores peak performance with aerospace-grade construction, reducing friction and extending engine life under the demanding conditions...09106843- SKU:
- 09106843
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$214.00 -
Wossner Piston Kit 94.95mm KTM 450 SX-F 2023-2025 4075DA
WOSSNER
$244.00If you're running a KTM 450 SX-F and pushing hard on the track or trail, your factory piston won't hold up to sustained high-RPM abuse. This Wossner kit gives you a purpose-built replacement engineered to handle aggressive riding while delivering sharper...09106844- SKU:
- 09106844
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$244.00 -
Wossner Piston Kit 51.95 mm Big Bore 105 cc 2021-2024 Gas Gas MC 85 8329DA
WOSSNER
$152.00When you're running a big-bore 105cc build, piston quality directly determines engine longevity and throttle response. Wossner's aerospace-grade aluminum and permanent skirt coating eliminate friction losses while keeping combustion noise...09106846- SKU:
- 09106846
- Availability:
- Ships Same Business Day
- Weight:
- 6.05 LBS
$152.00
