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
-
WSM Piston Kit - Kawasaki - +.25 mm 010-810-04K
WSM
$86.28When you're pushing your Kawasaki to the limit, stock pistons become your performance ceiling. The WSM Piston Kit delivers OEM-matching quality with critical upgrades—MOS2-coated skirts that actively dissipate heat while reducing friction, and specially...01081004- SKU:
- 01081004
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 76.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$86.28 -
WSM Piston Kit - Kawasaki 650 - +.5 mm 010-810-05K
WSM
$86.28If you're rebuilding or upgrading your Kawasaki 650, piston quality directly impacts combustion efficiency, heat management, and engine longevity. The WSM Piston Kit delivers OEM-equivalent construction with purposeful upgrades—specifically the MOS2...01081005- SKU:
- 01081005
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 76.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
$86.28 -
WSM Piston Kit - Kawasaki 550 - +.5 mm 010-812-05K
WSM
$81.73If you're building or rebuilding a Kawasaki 550 engine, piston quality directly impacts reliability, power output, and engine longevity. WSM pistons are engineered to OEM or better standards with advanced coatings and hardened construction that reduce...01081205- SKU:
- 01081205
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
$81.73 -
WSM Piston Kit - Sea-Doo 720 - Standard 010-817K
WSM
$89.33A quality piston kit is the foundation of reliable engine performance, and the WSM 010-817K delivers OEM-equivalent construction with engineered improvements for reduced heat and friction. The MOS2 coating on the skirts actively draws heat away from the...010817- SKU:
- 010817
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$89.33 -
WSM Piston Kit - Sea-Doo 720 - +.25 mm 010-817-04K
WSM
$89.33A piston kit failure can sideline your Sea-Doo 720 when you need it most. WSM's +.25 mm oversize pistons deliver OEM-equivalent quality with engineering upgrades specifically designed to reduce friction, lower operating temperatures, and extend engine...01081704- SKU:
- 01081704
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 82.00 MM
- MODEL:
- ORIGINAL
$89.33 -
WSM Piston Kit - Sea-Doo 720 - +.5 mm 010-817-05K
WSM
$89.33When you're running a Sea-Doo 720 at the limit, stock pistons become the weak link. The WSM Piston Kit delivers OEM-quality construction with measurable upgrades—specifically the MOS2 coating on the skirts that actively dissipates heat while reducing...01081705- SKU:
- 01081705
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 82.00 MM
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - Standard 010-818K
WSM
$89.33Sea-Doo 800 engines demand precision-engineered internals to handle sustained high-RPM performance, and OEM pistons often fall short in durability under aggressive use. The WSM Piston Kit delivers OEM-equivalent quality with meaningful...010818- SKU:
- 010818
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - +.5 mm 010-818-05K
WSM
$89.33Stock pistons can't handle the demands of high-performance Sea-Doo 800 engines—especially when you're pushing for more power and reliability. The WSM Piston Kit delivers OEM-quality construction with critical performance upgrades, including a MOS2...01081805- SKU:
- 01081805
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- BORE SIZE METRIC:
- 82.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - +1 mm 010-818-07K
WSM
$89.33When you're pushing a Sea-Doo 800 to its limits, factory pistons become a liability. The WSM Piston Kit delivers OEM-quality construction with engineered improvements—notably the MOS2 coating that actively dissipates heat and reduces friction for...01081807- SKU:
- 01081807
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
$89.33 -
WSM Piston Kit - Sea-Doo 951 - Standard 010-819K
WSM
$98.28When your Sea-Doo 951 is pushing peak RPMs, stock pistons become a reliability liability. The WSM Piston Kit delivers OEM-or-better construction with advanced thermal management that reduces operating temperatures and friction, translating directly to...010819- SKU:
- 010819
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 87.91 MM
- PRODUCT NAME:
- PISTON KIT
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
WSM Piston Kit - Sea-Doo 951 - +.25 mm 010-819-04K
WSM
$98.28If you're pushing your Sea-Doo 951 to the limit, factory pistons won't cut it—they'll give up first. This WSM Piston Kit delivers OEM-quality construction with engineering upgrades that reduce heat and friction, giving you more power, better reliability,...01081904- SKU:
- 01081904
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 87.91 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
$98.28 -
WSM Piston Kit - Sea-Doo 951 - +.5 mm 010-819-05K
WSM
$98.28If you're rebuilding a Sea-Doo 951 engine or pushing past factory limits, piston quality directly determines whether your engine lives or fails under load. The WSM Piston Kit delivers OEM-equivalent construction with performance-oriented...01081905- SKU:
- 01081905
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
$98.28 -
WSM Piston Kit - Kawasaki - Standard 010-820K
WSM
$89.33If you're running a Kawasaki engine that demands reliability under sustained high RPM, a quality piston kit is non-negotiable—it's the foundation of durability when power levels climb. The WSM Piston Kit delivers OEM-matching construction with genuine...010820- SKU:
- 010820
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
$89.33 -
WSM Piston Kit - Kawasaki 750 - +.5 mm 010-820-05K
WSM
$89.33Piston wear is one of the fastest paths to catastrophic engine failure, especially in high-performance Kawasaki 750 applications where heat and friction compound stress on critical components. The WSM Piston Kit delivers OEM-equivalent quality with...01082005- SKU:
- 01082005
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Kawasaki - +.25 mm 010-821-04K
WSM
$89.33When you're pushing your Kawasaki to the limit, stock pistons simply can't keep up with the heat and stress of high-performance riding. The WSM Piston Kit delivers OEM-equivalent quality with engineered upgrades—including a specialized MOS2 coating that...01082104- SKU:
- 01082104
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$89.33 -
WSM Piston Kit - Kawasaki - +.5 mm 010-821-05K
WSM
$89.33When you're pushing your Kawasaki to the limit, OEM pistons become a liability. The WSM Piston Kit delivers OEM-equivalent quality with meaningful upgrades—particularly the MOS2-coated skirts that actively dissipate heat and reduce friction, translating...01082105- SKU:
- 01082105
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$89.33 -
WSM Piston Kit - Yamaha 701- +.25 mm 010-825-04K
WSM
$89.33Stock pistons wear out, overheat, and limit your engine's potential—especially under sustained high-RPM operation. The WSM Piston Kit delivers OEM-equivalent quality with critical performance upgrades: MOS2-coated skirts that actively dissipate heat...01082504- SKU:
- 01082504
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,25 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 81.00 MM
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Yamaha 701 - +.5 mm 010-825-05K
WSM
$89.33When you're pushing a Yamaha 701 to its limits, factory pistons become your weakest link. The WSM Piston Kit delivers OEM-quality construction with critical upgrades—MOS2-coated skirts that actively dissipate heat, specially hardened ring grooves, and an...01082505- SKU:
- 01082505
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- KIT
$89.33 -
WSM Piston Kit - +.75 mm - Yamaha 701 010-825-06K
WSM
$89.33When you're pushing your Yamaha 701 to the limit, stock pistons become your performance ceiling. This WSM kit delivers the displacement increase and thermal management you need to unlock more power while maintaining the reliability that keeps you on the...01082506- SKU:
- 01082506
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +0.75 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,75 MM
- BORE SIZE METRIC:
- 81.00 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
$89.33 -
WSM Piston Kit - Yamaha - +.5 mm 010-829-05PK
WSM
$98.28When you're pushing your Yamaha engine to the limit, stock pistons become your performance ceiling. The WSM Piston Kit delivers OEM-matching quality with critical upgrades—superior ring design, thermal management coatings, and hardened ring grooves—that...01082905P- SKU:
- 01082905P
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$98.28
