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 Standard Kawasaki KX 125 1995-1997 555M05600
WISECO
$154.95If you're running a KX 125 2-stroke, piston wear is inevitable—and when it happens, performance tanks fast. The Wiseco 555M05600 delivers OEM-equivalent fitment with proven durability, so you can trust it to handle aggressive riding without compromising...555M05600- SKU:
- 555M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 50,6 MM
- STROKE LENGTH METRIC:
- 50.60 MM
- UNITS:
- EACH
$154.95 -
Wiseco Piston Kit for Honda TRX400EX 1999-2008 86mm Bore 10:1 Compression 4606M08600
WISECO
$210.95When you're pushing a Honda TRX400EX to its limits, your factory piston won't cut it. This Wiseco forged piston kit delivers the strength and precision needed to handle aggressive riding while unlocking real performance gains. Backed by Wiseco's proven...4606M08600- SKU:
- 4606M08600
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 70.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 86.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 397 CC
- PISTON DIAMETER METRIC:
- 85.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$210.95Qty in Cart: 0Quantity:Price:$210.95Subtotal: -
Wiseco Piston Honda CRF250R 2004-2007 4366M09750
WISECO
$239.95The Wiseco piston is engineered for riders who demand reliable power without compromise. A high-silicon aluminum alloy construction paired with an 11:1 compression ratio delivers measurable gains in combustion efficiency and throttle response. This...4366M09750- SKU:
- 4366M09750
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 591 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 97.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON DIAMETER METRIC:
- 97.42 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 80.00 MM
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit 1.00mm Oversize 57.00mm Yamaha YZ125 1976-1982 435M05700
WISECO
$154.95When your YZ125's original piston reaches its limits, a quality replacement isn't just a maintenance item—it's the foundation for reliable power and longevity. The Wiseco 435M05700 delivers the precision engineering and proven durability that serious...435M05700- SKU:
- 435M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 57.00 MM
- STROKE LENGTH METRIC:
- 50.00 MM
$154.95 -
Wiseco Piston Kit 1mm Oversize 71mm Bore for Suzuki DS250 1980 380M07100
WISECO
$210.95If you're running a Suzuki DS250 and want to unlock additional displacement and power without a complete engine overhaul, this 1mm oversize Wiseco piston kit is your answer. The forged aluminum construction combined with precision ring design ensures...380M07100- SKU:
- 380M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 71.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON DIAMETER METRIC:
- 70.92 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$210.95 -
Wiseco Piston Kit Suzuki TS250 1973-1981 70mm 380M07000
WISECO
$210.95Whether you're rebuilding a tired TS250 or maximizing output on an already-strong platform, a quality piston kit is foundational to reliable power delivery. Wiseco's 380M07000 delivers the precision bore diameter and material science necessary for...380M07000- SKU:
- 380M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.92 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$210.95 -
Wiseco Piston Kit 57mm Oversize for Yamaha DT125 1974-1981 236M05700
WISECO
$154.95A worn or damaged piston directly compromises your DT125's combustion efficiency, throttle response, and engine longevity. The Wiseco 236M05700 restores full power output and reliability with precision-engineered geometry and aerospace-grade materials...236M05700- SKU:
- 236M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 57.00 MM
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$154.95 -
JE PISTONS Piston Kit 379030
JE PISTONS
$314.99If you're building or rebuilding an engine for competition or high-output street duty, piston quality directly determines your engine's reliability ceiling. JE Pistons' 379030 kit delivers the precision engineering and material science required to...09106391- SKU:
- 09106391
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- BORE SIZE METRIC:
- 78.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$314.99 -
JE PISTONS Piston Kit 379029
JE PISTONS
$314.99When you're pushing your engine to the limit, stock pistons are a liability. JE PISTONS' 379029 kit delivers the reliability and precision engineering demanded by professional racing and extreme high-performance builds—engineered to withstand the...09106390- SKU:
- 09106390
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.1:1
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$314.99 -
JE PISTONS Piston Kit 284667
JE PISTONS
$329.99When you're pushing your engine to the limit in professional competition, your pistons need to survive extreme pressures and temperatures without compromise. JE Pistons' 284667 Kit delivers the precision engineering and materials science required for...09105890- SKU:
- 09105890
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$329.99 -
JE PISTONS Piston Kit 274759
JE PISTONS
$309.99When you're pushing your engine to the limit in competition, your pistons need to deliver reliability without compromise. JE PISTONS' Pro Series 274759 kit is engineered for extreme applications with internal and external bracing that handles sustained...09105888- SKU:
- 09105888
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- +4,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON HEAD SHAPE:
- FLAT TOP
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- UNITS:
- KIT
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 488 CC
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +4.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$309.99 -
JE PISTONS Piston Kit 274756
JE PISTONS
$309.99When you're pushing your engine to the absolute limit, stock pistons won't cut it. JE PISTONS' Pro Series 274756 kit is engineered for extreme competition applications where reliability and performance are non-negotiable. These 2618-T6 forgings deliver...09105887- SKU:
- 09105887
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PISTON HEAD SHAPE:
- DOMED
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$309.99Qty in Cart: 0Quantity:Price:$309.99Subtotal: -
JE PISTONS Piston Kit 274755
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in professional competition, your pistons need to survive extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 274755 kit is engineered specifically for forced induction and...09105886- SKU:
- 09105886
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- BORE - OVERSIZE METRIC:
- STANDARD
$309.99 -
JE PISTONS Piston Kit 247940
JE PISTONS
$299.99When you're pushing an engine to its absolute limits in competition, your pistons need to survive extreme pressure, heat, and RPM without compromise. JE PISTONS' Pro Series 247940 kit delivers the precision engineering and material science required for...09105858- SKU:
- 09105858
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 270 CC
- PISTON HEAD SHAPE:
- DISHED
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- +3,00 MM
- RIDING STYLE:
- OFF-ROAD
$299.99 -
JE PISTONS Piston Kit 247937
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition, stock pistons won't cut it—you need components engineered specifically for extreme duty. JE PISTONS' Pro Series 247937 kit delivers the strength, precision, and weight savings that...09105857- SKU:
- 09105857
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE SIZE METRIC:
- 77.00 MM
$309.99 -
JE PISTONS Piston Kit 199656
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition, your pistons need to withstand extreme pressures without compromise. JE PISTONS' Pro Series 199656 kit delivers the precision engineering and material science required for...09105829- SKU:
- 09105829
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- +2,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 415 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- JE PISTON
- BORE SIZE METRIC:
- 87.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- ROUND FORGED DESIGN
$309.99 -
Wossner Piston Kit 46.95mm Honda CR80R 1992-2002 8237DA
WOSSNER
$112.00When you're pushing a CR80R to its limits, stock pistons become the weak link. The Wossner 8237DA replaces worn or damaged pistons with a precision-engineered component that delivers measurable gains in reliability and throttle response. Built with...09105581- SKU:
- 09105581
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 80 CC
- PISTON SIZE METRIC:
- 46.95 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00 -
Wossner Piston Kit 47.45mm Yamaha PW80 1983-2006 8233D050
WOSSNER
$112.00If you're running a PW80 at the track or pushing it hard on the trail, piston failure isn't an option. The Wossner 8233D050 kit delivers the durability and precision you need to keep your 2-stroke reliable through countless heat cycles and high-load...09105579- SKU:
- 09105579
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON SIZE METRIC:
- 47.45 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit KTM 125 2007-2025 8210DA
WOSSNER
$132.00When a 2-stroke engine is pushed hard—whether on the track or the trail—factory pistons wear quickly and performance suffers. The Wössner Piston Kit 8210DA replaces worn components with German-engineered precision, restoring compression, reducing...09105577- SKU:
- 09105577
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 55.94 MM
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
Wossner Piston Kit Kawasaki KX250 1978-1986 8203DA
WOSSNER
$152.00The Wossner 8203DA piston kit is engineered to restore or upgrade your KX250's top-end with OEM-quality reliability and measurable performance gains. A complete, bolt-together solution that eliminates guesswork—piston, rings, pin, and clips arrive ready...09105575- SKU:
- 09105575
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 69.94 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal:
