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
-
Wossner Piston Kit 76.96mm Kawasaki KX250F 2011-2014 8814DA
WOSSNER
$184.00When you're running a KX250F at the edge of its limits, piston durability and precision become non-negotiable. The Wossner 8814DA delivers German-engineered reliability with a complete kit that handles high-RPM demands without compromise. Whether you're...09104989- SKU:
- 09104989
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Kawasaki KX250F 2011-2014 13.5:1 CR 8814DC
WOSSNER
$184.00The stock piston in your KX250F won't survive sustained high-RPM performance or aggressive riding. Wossner's 13.5:1 compression ratio piston delivers the reliability and efficiency you need to push harder without sacrificing engine longevity. This is a...09104991- SKU:
- 09104991
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 77.02 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- 76.98 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,02 MM
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wossner Piston Kit Yamaha YZ450F 2014-2017 8895DB
WOSSNER
$204.00The Wossner Piston Kit for your YZ450F delivers the durability and precision needed to handle sustained high-RPM performance and aggressive riding conditions. Built from 4032 T6 forged aluminum with a permanent skirt coating, this kit minimizes friction...09106162- SKU:
- 09106162
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 97.01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON SIZE METRIC:
- 96.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Kit KTM 450 SX-F 2007-2012 96.96mm 8665DA
WOSSNER
$214.00If you're pushing your KTM 450 SX-F to its limits, your factory piston won't cut it. Wossner's 96.96mm forged piston kit delivers the durability and precision needed for consistent high-rpm performance, whether you're racing motocross or putting in...09106170- SKU:
- 09106170
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 97.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 96.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$214.00Qty in Cart: 0Quantity:Price:$214.00Subtotal: -
Wossner 55.94mm Dual Ring Piston Kit Honda CR125M 1973-1978 8151DA
WOSSNER
$132.00The Wossner 8151DA piston kit is engineered for CR125M engines that demand reliability and consistent performance across extended ride cycles. Original pistons wear, lose compression, and increase noise—this complete kit restores your engine's...09105554- SKU:
- 09105554
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 55.94 MM
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
Wossner Piston Kit 66.94mm Honda CR250R 1984-1985 8156D100
WOSSNER
$152.00The Wossner 8156D100 piston kit delivers the reliability and thermal stability demanded by 2-stroke competition and high-hour recreational riding. Built from 4032 T6 forged aluminum and engineered with Finite Element Analysis, this German-manufactured...09105559- SKU:
- 09105559
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.94 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 250 CC
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner 67.19 mm Piston Kit for Honda CR250R 1984-1985 8156D125
WOSSNER
$182.00If you're running a CR250R, piston wear directly impacts throttle response, compression, and ring seal—three factors that separate competitive lap times from mid-pack finishes. The Wossner 8156D125 kit delivers a complete OEM-replacement solution with...09105560- SKU:
- 09105560
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- +1.25 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +1,25 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 67.19 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 67.25 MM
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 250 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$182.00Qty in Cart: 0Quantity:Price:$182.00Subtotal: -
Wossner Piston Kit Honda CR250R 1984-1985 67.44mm 8156D150
WOSSNER
$182.00Two-stroke engines demand precision engineering to handle extreme combustion pressures and thermal cycling. The Wossner Piston Kit 8156D150 delivers the durability and reduced friction your Honda CR250R needs to maintain peak performance lap after lap...09105561- SKU:
- 09105561
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,50 MM
- PISTON SIZE METRIC:
- 67.44 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- ATV
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$182.00Qty in Cart: 0Quantity:Price:$182.00Subtotal: -
Wossner 1984-1985 Honda CR250R 2.00mm Oversize Piston Kit 8156D200
WOSSNER
$182.00If you're running a 1984-1985 Honda CR250R at the edge of its limits, piston reliability becomes non-negotiable. The Wossner 8156D200 oversize kit restores compression and power while delivering the durability needed for consistent lap times and long...09105562- SKU:
- 09105562
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 68.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 67.94 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$182.00Qty in Cart: 0Quantity:Price:$182.00Subtotal: -
Wossner Piston Kit Honda CR250R 1997-2001 8161DA
WOSSNER
$150.96The Wossner Piston Kit 8161DA delivers the reliability and precision your Honda CR250R demands, whether you're pushing lap times or rebuilding after hard use. This complete kit eliminates the guesswork of sourcing individual components, while the...09105563- SKU:
- 09105563
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
Wossner Piston Kit Yamaha 49cc 2000 8267DA
WOSSNER
$102.00When you're running a high-revving 2-stroke, piston integrity directly impacts power delivery, longevity, and reliability. The Wossner 8267DA delivers OEM-quality fitment with race-proven durability, engineered to handle sustained high loads without...09105587- SKU:
- 09105587
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 40.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 39.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 49 CC
- TYPE:
- SINGLE RING
$102.00Qty in Cart: 0Quantity:Price:$102.00Subtotal: -
VERTEX Piston Kit 23621050
VERTEX
$208.95The VERTEX Piston Kit 23621050 delivers the durability and precision needed for serious engine builds, whether you're chasing peak horsepower or extending component lifespan. With advanced heat treatment, specialized coatings, and material options...09102053- SKU:
- 09102053
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- DISPLACEMENT:
- 100 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- PISTON DIAMETER METRIC:
- 52.95 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$208.95Qty in Cart: 0Quantity:Price:$208.95Subtotal: -
VERTEX Piston Kit 23646A
VERTEX
$256.95The VERTEX Piston Kit 23646A delivers the durability and precision your engine demands, whether you're rebuilding a worn top-end or chasing peak performance. Available in multiple configurations—cast, forged, high-compression, and big-bore options—this...09102055- SKU:
- 09102055
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit - Standard 22809B
VERTEX
$189.95Engine durability under sustained high RPM depends on piston quality—cheap pistons warp, seize, or fail catastrophically. The VERTEX Piston Kit 22809B delivers precision-engineered reliability with purpose-built materials and coatings designed to handle...09101034- SKU:
- 09101034
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$189.95 -
Wiseco Piston Kit Kawasaki KX250 1993-2001 RE926M06640
WISECO
$249.95Your KX250's engine demands a piston built to handle the intense heat, pressure, and detonation cycles of competitive riding. The Wiseco RE926M06640 piston kit delivers the precision fit and durability needed to maintain peak performance lap after lap,...09105097- SKU:
- 09105097
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- TYPE:
- RACER ELITE
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
Wiseco Piston Kit with Gaskets Kawasaki KX250 1993-2001 PK1290
WISECO
$269.95The Wiseco PK1290 piston kit restores your KX250's combustion efficiency and throttle response, whether you're chasing lap times or weekend trail rides. Factory pistons wear, lose compression, and rob you of the power your bike was built to deliver—this...09030254- SKU:
- 09030254
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,10 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 67.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
WISECO Piston - +1.00 mm - Honda ATC 250 R/TRX250R/CR250R 526M06700
WISECO
$232.95If you're running a Honda ATC250R, TRX250R, or CR250R at the edge of its limits, a worn or stock piston is costing you power and reliability. The Wiseco +1.00 mm oversized piston delivers the compression and durability required for consistent high-RPM...526M06700- SKU:
- 526M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$232.95 -
On Sale
Wiseco Piston Kit for Suzuki PE 125 1980-1984 490M06300
WISECO
MSRP: $154.95Now: $132.00Was: $154.95If you're running a Suzuki PE 125 two-stroke, piston wear is inevitable—and it directly impacts compression, throttle response, and overall engine reliability. A quality piston kit restores lost performance while giving you the durability needed for...490M06300- SKU:
- 490M06300
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- STROKE LENGTH:
- 57,00 MM
- BORE SIZE METRIC:
- 63.00 MM
- DISPLACEMENT:
- 172 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 57.00 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit 56.00 mm Oversize for Yamaha YZ125 1997-2004 765M05600
WISECO
MSRP: $199.95Now: $170.00Was: $199.95If you're running a YZ125 hard on the track or trail, piston wear is inevitable—and a failing piston means catastrophic engine damage. The Wiseco 56.00 mm Oversize Piston Kit restores your engine's compression and power while delivering the durability...765M05600- SKU:
- 765M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 134 CC
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit 41.50mm Oversize for Yamaha PW50 2021-2026 653M04150
WISECO
MSRP: $116.95Now: $93.00Was: $116.95Wiseco pistons are built for riders who demand reliable performance upgrades without compromise. If you're running your PW50 hard on the trail or track, this 41.50mm oversize kit delivers the precision fit and thermal stability needed for consistent...653M04150- SKU:
- 653M04150
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 39,20 MM
- STROKE LENGTH METRIC:
- 39.20 MM
- BORE SIZE METRIC:
- 41.50 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
MSRP: $116.95Now: $93.00Was: $116.95
