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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VERTEX Piston Kit 22813CD
VERTEX
$93.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102064- SKU:
- 09102064
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$93.95 -
VERTEX Piston Kit 23630A
VERTEX
$201.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09102066- SKU:
- 09102066
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.34 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$201.95 -
VERTEX Piston Kit 23630B
VERTEX
$197.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09102067- SKU:
- 09102067
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$197.95 -
VERTEX Piston Kit 22978A
VERTEX
$280.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102070- SKU:
- 09102070
- Availability:
- Ships Same Business Day
- Weight:
- 0.84 LBS
$280.95 -
VERTEX Piston Kit - Stroker 23879B
VERTEX
$163.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103678- SKU:
- 09103678
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST STROKER
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 52.00 MM
- PISTON DIAMETER METRIC:
- 51.96 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 112 CC
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$163.95 -
VERTEX Piston Kit 24018A
VERTEX
$243.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103679- SKU:
- 09103679
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
$243.95 -
VERTEX Piston Kit - High Compression 24021B
VERTEX
$268.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103688- SKU:
- 09103688
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
$268.95 -
On Sale
VERTEX Piston Kit - High Compression 24022B
VERTEX
MSRP: $307.95Now: $197.00Was: $307.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103691- SKU:
- 09103691
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 95.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
MSRP: $307.95Now: $197.00Was: $307.95 -
VERTEX Piston Kit VTKTC22915B
VERTEX
$328.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103717- SKU:
- 09103717
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
$328.95 -
VERTEX Piston Kit VTKTC22915B-1
VERTEX
$328.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103718- SKU:
- 09103718
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
$328.95 -
VERTEX Piston Kit VTKTC22951A
VERTEX
$303.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103721- SKU:
- 09103721
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
$303.95 -
VERTEX Piston Kit VTKTC22983A
VERTEX
$280.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103724- SKU:
- 09103724
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$280.95 -
Wiseco Piston Kit 86mm Bore Yamaha DT400 1975-1978 MX400 1975 232M08600
WISECO
$209.95Upgrade your engine's performance with the WISECO Piston +1.00 mm 232M08600, crafted from a high-silicon alloy for exceptional strength and reliability. Designed for both trail and racing applications, this piston ensures optimal power delivery and...232M08600- SKU:
- 232M08600
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 85.92 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 70.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 397 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 86.00 MM
$209.95Qty in Cart: 0Quantity:Price:$209.95Subtotal: -
Wiseco Piston Kit Honda TRX400EX 1999-2008 4606M08700
WISECO
$219.95Upgrade your motorcycle's performance with the WISECO Piston Kit XR/TRX400 4606M08700. Designed for durability and optimal efficiency, this piston kit enhances your engine's power output while ensuring reliability. Please note that this kit does not...09102910- SKU:
- 09102910
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- STROKE LENGTH METRIC:
- 70.00 MM
- BORE SIZE METRIC:
- 87.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 397 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$219.95 -
Wiseco Piston Kit 88mm 11:1 Compression for Honda XR400R 1996-2004 4628M08800
WISECO
$244.95Upgrade your ATV's performance with the WISECO Piston Kit designed for XR/TRX400 models. This high-quality piston kit enhances engine efficiency and power while ensuring durability under demanding conditions. Please note that this kit does not include a...09102915- SKU:
- 09102915
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 70.00 MM
- BORE SIZE METRIC:
- 88.00 MM
- DISPLACEMENT:
- 397 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +3.00 MM
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit Yamaha XT350 1985-2000 86mm 9:1 Compression 4674M08600
WISECO
$174.95Upgrade your motorcycle’s performance with the WISECO Piston Kit designed specifically for the XT/TT 350 models. This high-quality piston kit enhances engine efficiency and power output, ensuring a smoother ride and improved throttle response. Please...09102916- SKU:
- 09102916
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 346 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.60 MM
- BORE SIZE METRIC:
- 86.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
$174.95 -
Wiseco Piston Kit Yamaha XT350 1985-2000 87.50mm 9:1 4674M08750
WISECO
$184.95Upgrade your off-road performance with the WISECO Piston Kit designed specifically for the XT/TT 350. This high-quality piston kit ensures optimal engine efficiency and durability, allowing you to tackle any terrain with confidence. Please note that this...09102917- SKU:
- 09102917
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 87.00 MM
- DISPLACEMENT:
- 346 CC
- STROKE LENGTH METRIC:
- 59.60 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$184.95 -
Wiseco Piston Kit 88.00mm Oversize Yamaha YZ490 1984-1990 546M08800
WISECO
$234.95Elevate your performance with the Wiseco +1.00 mm piston, engineered from high-silicon aluminum for unparalleled strength and reliability. Designed for both trail and racing applications, this piston maximizes horsepower and torque, ensuring you get the...546M08800- SKU:
- 546M08800
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 487 CC
- STROKE LENGTH:
- 82,00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
$234.95 -
Wiseco Piston 88.5mm Oversize Yamaha WR500Z 1992-1993 546M08850
WISECO
$244.95Unlock the full potential of your Yamaha WR 500 or YZ 490 with the Wiseco +1.50 mm piston, engineered from premium high-silicon aluminum alloy. Designed for both trail and racing applications, this piston enhances durability and power, ensuring your ride...546M08850- SKU:
- 546M08850
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE - OVERSIZE METRIC:
- +1.50 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE SIZE METRIC:
- 88.50 MM
- DISPLACEMENT:
- 487 CC
- STROKE LENGTH:
- 82,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$244.95 -
Wiseco Piston 89mm +2mm Oversize for Yamaha YZ490 1984-1990 546M08900
WISECO
$244.95Unlock the full potential of your Yamaha WR 500 or YZ 490 with the Wiseco forged piston, engineered for exceptional strength and reliability. Designed for both trail and racing applications, this piston delivers enhanced durability, increased horsepower,...546M08900- SKU:
- 546M08900
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 487 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 82,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 89.00 MM
- STROKE LENGTH METRIC:
- 82.00 MM
$244.95
