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
-
MOOSE RACING Piston Kit MP3031C
MOOSE RACING
$0.00High-RPM racing demands pistons engineered to handle extreme cylinder pressures without sacrificing reliability. The MOOSE RACING Piston Kit MP3031C delivers race-proven forging technology with internal bracing and DLC pin coatings that reduce friction...9106484- SKU:
- 9106484
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MP3035
MOOSE RACING
$125.95Whether you're pushing peak boost or maximizing naturally aspirated output, piston durability and ring seal are non-negotiable. The MOOSE RACING Piston Kit MP3035 delivers race-proven construction designed to handle extreme cylinder pressures while...09106481- SKU:
- 09106481
- Availability:
- Ships Same Business Day
- Weight:
- 19.20 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal: -
MOOSE RACING Piston Kit - 71.95 mm MSE23375B
MOOSE RACING
$141.95Engine wear accelerates under sustained performance demands, and OEM pistons often fail to meet the durability requirements of serious racers and high-mileage builds. The MOOSE RACING Piston Kit MSE23375B delivers gravity-cast construction with enhanced...09102714- SKU:
- 09102714
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
$141.95Qty in Cart: 0Quantity:Price:$141.95Subtotal: -
WSM Piston Kit - Kawasaki 900 - Standard 010-840K
WSM
$76.57A piston kit is one of the most critical internal components you'll upgrade in a high-performance build—it directly impacts compression ratio, heat dissipation, and ring sealing consistency. The WSM 010-840K delivers OEM-equivalent quality with...010840- SKU:
- 010840
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 73.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$76.57Qty in Cart: 0Quantity:Price:$76.57Subtotal: -
WSM Piston Kit - Polaris - Standard 010-834K
WSM
$85.08Piston failure under load is one of the costliest failures in high-performance engines. The WSM Piston Kit delivers OEM-quality construction with measurable improvements in heat management and ring groove durability, directly translating to longer engine...010834- SKU:
- 010834
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 71.30 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$85.08Qty in Cart: 0Quantity:Price:$85.08Subtotal: -
WSM Piston Kit - Sea-Doo - +.50 mm 010-816-05K
WSM
$76.57Sea-Doo pistons experience extreme heat and pressure during extended operation, making OEM-quality replacements essential for maintaining peak performance and engine longevity. The WSM Piston Kit delivers precision-engineered internals with advanced...01081605- SKU:
- 01081605
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
$76.57Qty in Cart: 0Quantity:Price:$76.57Subtotal: -
WSM Piston Kit - Kawasaki - Standard 010-821K
WSM
$85.08When you're pushing your Kawasaki to the limit, stock pistons become your weak point. The WSM Piston Kit delivers OEM-equivalent quality with engineering upgrades that reduce friction, manage heat more effectively, and extend piston life under sustained...010821- SKU:
- 010821
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$85.08Qty in Cart: 0Quantity:Price:$85.08Subtotal: -
WSM Piston Kit - Polaris - Standard 010-832K
WSM
$93.60If you're running Polaris sleds hard, your stock pistons are likely your weakest link—heat and friction rob horsepower and shorten engine life. The WSM Piston Kit replaces worn or damaged pistons with OEM-equivalent or better construction, while the...010832- SKU:
- 010832
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 81.00 MM
- PRODUCT NAME:
- PISTON KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
WSM Piston Kit - Sea-Doo - +.5 mm 010-815-05K
WSM
$73.24Stock pistons are a compromise between cost and performance—but your Sea-Doo engine deserves better. WSM Piston Kits deliver OEM-equivalent quality with measurable gains in durability and power through advanced materials and precision engineering...01081505- SKU:
- 01081505
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 76.00 MM
$73.24 -
Wossner Piston Kit KTM 250 2005-2025 8169DC
WOSSNER
$152.00When your 2-stroke KTM 250 is pushing hard on the track or trail, your piston kit needs to deliver consistent power while managing extreme temperatures and loads. The Wossner 8169DC is engineered to replace worn or damaged pistons with a complete...09104863- SKU:
- 09104863
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00 -
On Sale
Wiseco Piston Kit 2.00mm Oversize 73.95mm Yamaha YZ250 1976-1979 234M07200
WISECO
MSRP: $232.95Now: $191.00Was: $232.95When you're pushing a classic YZ250 to its limits, a worn or damaged piston compromises compression, throttle response, and overall reliability. The Wiseco 234M07200 restores lost performance with a high-silicon alloy forging that withstands the demands...234M07200- SKU:
- 234M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +2,00 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- PRODUCT NAME:
- PISTON KIT
MSRP: $232.95Now: $191.00Was: $232.95 -
On Sale
WISECO Piston Kit - Kawasaki WK1061
WISECO
MSRP: $389.95Now: $331.00Was: $389.95A 2-cycle engine rebuild demands precision components that can withstand sustained high RPM loads and thermal stress. The Wiseco WK1061 piston kit eliminates the guesswork by bundling OEM-grade pistons with matched rings, pins, and gaskets—everything you...WK1061- SKU:
- WK1061
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- DISPLACEMENT:
- 760 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 80.89 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 81.00 MM
- PRODUCT NAME:
- REBUILD KIT
MSRP: $389.95Now: $331.00Was: $389.95Qty in Cart: 0Quantity:Price:MSRP: $389.95Now: $331.00Was: $389.95Subtotal: -
On Sale
Wiseco 66.5mm Piston Kit for 1979-1981 Yamaha DT175 471M06650
WISECO
MSRP: $162.95Now: $132.00Was: $162.95When your DT175's original piston wears out, you're facing either a seized engine or a complete rebuild—neither is cheap. The Wiseco 471M06650 delivers the durability and precision you need to restore full compression and throttle response, whether...471M06650- SKU:
- 471M06650
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.50 MM
- DISPLACEMENT:
- 172 CC
- STROKE LENGTH METRIC:
- 50.00 MM
MSRP: $162.95Now: $132.00Was: $162.95 -
Wossner Piston Kit 66.36mm for Suzuki RM250 2000-2002 8059DC
WOSSNER
$152.00The Wossner 8059DC piston kit delivers the durability and precision your RM250 demands when pushing peak RPM. Factory OEM pistons wear quickly under racing conditions—this German-engineered alternative uses 4032 T6 forged aluminum and a permanent skirt...09105497- SKU:
- 09105497
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Kawasaki KX85 2001-2025 8082DA
WOSSNER
$152.00If you're running a KX85 in competitive or high-mileage conditions, piston wear directly impacts throttle response, compression, and overall reliability. The Wossner 8082DA delivers the OEM replacement or performance upgrade path with proven German...09105506- SKU:
- 09105506
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 66.34mm Honda CR250R 1986-1996 8021DA
WOSSNER
$152.00The CR250R demands a piston that can withstand the extreme thermal and mechanical stresses of 2-stroke performance. Wossner's 8021DA kit delivers the precision engineering and material science required to maintain reliability at the edge of competitive...09104727- SKU:
- 09104727
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PISTON SIZE METRIC:
- 66.34 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$152.00 -
Wossner Honda CR250R 1986-1996 Piston Kit 8021DB
WOSSNER
$152.00A worn or damaged piston directly compromises engine compression, throttle response, and overall reliability—especially critical in 2-stroke engines where piston quality defines performance. The Wossner 8021DB delivers a complete OEM-replacement solution...09104728- SKU:
- 09104728
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit Honda CR250R 1986-1996 8021DC
WOSSNER
$152.00If you're running a CR250R at the track or trail, piston longevity and ring seal integrity directly impact your lap times and engine reliability. The Wossner 8021DC delivers the durability and precision needed to sustain peak performance lap after lap,...09104729- SKU:
- 09104729
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,02 MM
- PISTON SIZE METRIC:
- 66.36 MM
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 66.95mm 1989-1995 Suzuki RM250 8022DB
WOSSNER
$152.00When you're pushing an RM250 to its limits, piston durability and ring seal become non-negotiable. The Wossner 8022DB delivers the thermal stability and precision fit that 2-stroke performance demands, keeping combustion efficient and engine wear minimal...09104732- SKU:
- 09104732
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 67.01 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 53.95mm 2000-2003 Suzuki RM125 8061DA
WOSSNER
$122.00If you're running a 2000-2003 Suzuki RM125, a quality piston kit is essential to maintaining peak performance and engine reliability. The Wossner 8061DA delivers the durability and precision engineering you need to keep your top-end running strong,...09104770- SKU:
- 09104770
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 53.95 MM
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal:
