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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On Sale
Wiseco Piston Kit Standard 67.50mm for KTM 250 SX 1995 655M06750
WISECO
MSRP: $199.95Now: $170.00Was: $199.95The Wiseco Piston Kit Standard 67.50mm is engineered for KTM 250 SX and 250 EXC riders who demand reliable power delivery and engine longevity. High-silicon aluminum construction combined with precision CNC machining ensures exact tolerances that...601M06750- SKU:
- 601M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249,6 CC
- STROKE LENGTH:
- 69,50 MM
- BORE SIZE METRIC:
- 67.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 69.50 MM
- UNITS:
- EACH
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit Sea-Doo 3D 947 DI 2006-2007 WK1212
WISECO
MSRP: $469.95Now: $399.00Was: $469.95Top-end wear is inevitable in high-performance PWCs, but premature piston failure doesn't have to be. This Wiseco kit replaces worn or damaged pistons with forged components engineered for the thermal and mechanical demands of the Sea-Doo 3D 947...09031171- SKU:
- 09031171
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 960 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 88.40 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
MSRP: $469.95Now: $399.00Was: $469.95Qty in Cart: 0Quantity:Price:MSRP: $469.95Now: $399.00Was: $469.95Subtotal: -
On Sale
Wiseco Piston Kit Standard Bore 56mm Yamaha YZ125 1990-1992 594M05600
WISECO
MSRP: $154.95Now: $132.00Was: $154.95The OEM piston in your YZ125 is the heartbeat of your engine—and wear compromises both power and reliability. The Wiseco Piston Kit delivers CNC-precision engineering with high-silicone aerospace aluminum that resists heat and detonation far better than...09101681- SKU:
- 09101681
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.70 MM
- UNITS:
- EACH
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit 95mm 12.5:1 Compression for Yamaha WR450F 2010-2015 PK1359
WISECO
MSRP: $344.95Now: $293.00Was: $344.95The stock piston in your WR450F or YZ450F limits peak performance and durability under aggressive riding conditions. The Wiseco PK1359 replaces it with a precision-forged unit that delivers measurable gains in horsepower and torque while maintaining the...09030564- SKU:
- 09030564
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.94 MM
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 63.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $344.95Now: $293.00Was: $344.95Qty in Cart: 0Quantity:Price:MSRP: $344.95Now: $293.00Was: $344.95Subtotal: -
On Sale
Wiseco Piston Kit for Honda XR250R 1986-2004 PK1224
WISECO
MSRP: $274.95Now: $234.00Was: $274.95If you're running an XR250R hard—whether on the track or in the dirt—OEM pistons limit your engine's potential. The Wiseco PK1224 delivers measurable gains in horsepower and torque while maintaining the reliability you need for sustained high-RPM...09030571- SKU:
- 09030571
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE METRIC:
- +5.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 77.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
MSRP: $274.95Now: $234.00Was: $274.95Qty in Cart: 0Quantity:Price:MSRP: $274.95Now: $234.00Was: $274.95Subtotal: -
On Sale
Wiseco Piston Kit 54.00 mm Oversize for Honda XR100R 1985-2003 4666M05400
WISECO
MSRP: $154.95Now: $132.00Was: $154.95When your Honda's original piston wears or you're ready to unlock more power, this Wiseco piston kit delivers the precision and durability needed for reliable performance across demanding riding conditions. The forged aluminum construction with high...09100329- SKU:
- 09100329
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 103,00 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.00 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit for KTM 85 SX 17/14 2003-2025 RE918M05200
WISECO
MSRP: $171.95Now: $127.00Was: $171.95Two-stroke engines demand pistons engineered for high RPM reliability and consistent power delivery—the Wiseco Racer Elite 2-Stroke Series Piston Kit is purpose-built for KTM 85 SX riders who refuse to compromise on durability. Whether you're logging...09105102- SKU:
- 09105102
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
MSRP: $171.95Now: $127.00Was: $171.95Qty in Cart: 0Quantity:Price:MSRP: $171.95Now: $127.00Was: $171.95Subtotal: -
Wossner Piston Kit 53.94mm Honda CR125R 1988-1989 8125DA
WOSSNER
$132.00If you're rebuilding a 1988-1989 Honda CR125R 2-stroke, piston quality directly impacts power delivery, longevity, and throttle response. The Wossner 8125DA kit delivers OEM-spec fitment with premium materials and precision manufacturing, ensuring your...09104838- SKU:
- 09104838
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 53.94 MM
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
Wossner Honda CR125R 1987 Single Ring Piston Kit 8126DA
WOSSNER
$122.95If you're running a CR125R at the track or trail, piston wear directly impacts throttle response, compression, and reliability—and a worn OEM piston robs you of both power and longevity. The Wossner 8126DA replaces your stock piston with a...09104839- SKU:
- 09104839
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 54.00 MM
- PISTON SIZE METRIC:
- 53.94 MM
$122.95Qty in Cart: 0Quantity:Price:$122.95Subtotal: -
Wossner Piston Kit KTM 350 EXC-F 2012-2016 12.3:1 CR 8885DA
WOSSNER
$214.00If you're running a KTM 350 EXC-F hard, OEM pistons won't cut it. The Wossner 8885DA delivers the strength and precision engineering needed to handle aggressive riding and high-load conditions without sacrificing reliability. This complete kit gives you...09106127- SKU:
- 09106127
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 88.00 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 87.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- UNITS:
- KIT
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit KTM 250 SX 2019 8898DB
WOSSNER
$214.00When you're pushing a 250 SX to its limits, piston failure isn't an option—it's a catastrophe. The Wossner 8898DB is engineered to handle sustained high RPM loads and aggressive riding conditions with the kind of reliability that keeps you competitive...09106132- SKU:
- 09106132
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 95.01 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- UNITS:
- KIT
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner Piston Kit 67.4mm Kawasaki KX250 1990-1991 8109DA
WOSSNER
$152.00The Wossner Piston Kit 8109DA is engineered to deliver the reliability and performance your KX250 demands during high-RPM racing and trail riding. Built from 4032 T6 forged aluminum and finished with a permanent skirt coating, this kit reduces friction,...09105532- SKU:
- 09105532
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 67.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.34 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Kawasaki KX250 1990-1991 8109DB
WOSSNER
$152.00When running a high-strung 2-stroke engine like the KX250, piston durability directly impacts reliability and peak power delivery. Wossner's 8109DB kit delivers OEM-quality construction with German precision engineering—designed to handle sustained high...09105533- SKU:
- 09105533
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 67.41 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner 54mm Piston Kit for 1981-1984 Suzuki RM125 8124DA
WOSSNER
$132.00Your RM125's piston is the heart of combustion—when it wears, you lose compression, power, and responsiveness. The Wossner 8124DA replaces worn pistons with German-engineered precision, restoring the crisp throttle response and reliable power delivery...09105541- SKU:
- 09105541
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.94 MM
- PRODUCT NAME:
- PISTON KIT
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
WSM Piston Assembly - Yamaha - Standard 010-871K
WSM
$100.50Stock pistons don't cut it when you're pushing your Yamaha to the limit—heat buildup and friction rob you of power and longevity. WSM's piston assembly delivers OEM-matched quality with engineered upgrades that dissipate heat more effectively and...09101984- SKU:
- 09101984
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 75.90 MM
- MODEL:
- ORIGINAL
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$100.50Qty in Cart: 0Quantity:Price:$100.50Subtotal: -
WSM Piston Assembly - Sea-Doo - +1 mm 010-818-07PK
WSM
$93.60Whether you're chasing lap times or rebuilding after a season of hard use, piston quality directly impacts your Sea-Doo's reliability and power output. The WSM +1 mm 010 piston assembly delivers OEM-equivalent construction with purposeful...09101263- SKU:
- 09101263
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal:
