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 22978A
VERTEX
$302.95The VERTEX Piston Kit 22978A delivers the precision engineering and durability required for serious engine builds. Whether you're running a high-compression setup or increasing displacement, these...09102070- SKU:
- 09102070
- Availability:
- Ships Same Business Day
- Weight:
- 0.84 LBS
$302.95 -
VERTEX Piston Kit - Stroker 23879B
VERTEX
$176.95Whether you're building a high-displacement stroker engine or pushing the limits of your current platform, the VERTEX Piston Kit 23879B delivers the precision engineering and material science your...09103678- 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
$176.95 -
VERTEX Piston Kit 24018A
VERTEX
$262.95Premium pistons are the foundation of reliable high-RPM performance, and the VERTEX 24018A kit delivers the durability you need for sustained power without failure. Factory OEM pistons often...09103679- SKU:
- 09103679
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
$262.95 -
VERTEX Piston Kit - High Compression 24021B
VERTEX
$289.95High-compression pistons are essential for maximizing power output in forced induction and naturally aspirated engines that demand peak performance. The VERTEX 24021B kit delivers precision...09103688- 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
$289.95 -
On Sale
VERTEX Piston Kit - High Compression 24022B
VERTEX
MSRP: $301.95Now: $193.00Was: $301.95If you're building an engine that demands reliability under extreme combustion pressures, the VERTEX Piston Kit 24022B delivers the precision tolerances and durability required for sustained high-RPM...09103691- 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: $301.95Now: $193.00Was: $301.95 -
VERTEX Piston Kit VTKTC22915B
VERTEX
$354.95Whether you're building a high-revving engine or pushing existing power limits, piston quality directly impacts reliability and longevity under extreme conditions. The VERTEX Piston Kit VTKTC22915B...09103717- SKU:
- 09103717
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
$354.95 -
VERTEX Piston Kit VTKTC22915B-1
VERTEX
$354.95Stock pistons struggle under high-boost or extended track sessions—they warp, wear prematurely, and compromise your engine's reliability. The VERTEX Piston Kit VTKTC22915B-1 solves this with advanced...09103718- SKU:
- 09103718
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
$354.95 -
VERTEX Piston Kit VTKTC22951A
VERTEX
$327.95A piston kit is the heart of engine performance—it directly impacts compression ratio, combustion efficiency, and overall durability under extreme operating conditions. The VERTEX Piston Kit...09103721- SKU:
- 09103721
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
$327.95 -
VERTEX Piston Kit VTKTC22983A
VERTEX
$302.95A quality piston kit is the foundation of reliable high-RPM performance, and the VERTEX Piston Kit VTKTC22983A delivers the durability and precision demanded by serious builders. The T-5 heat...09103724- SKU:
- 09103724
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
Wiseco Piston Kit 86mm Bore Yamaha DT400 1975-1978 MX400 1975 232M08600
WISECO
$232.95The Wiseco Piston Kit delivers the reliability and performance precision you need for a complete top-end rebuild on your classic Yamaha DT400 or MX400. This +1.00mm oversized piston compensates for...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
$232.95Qty in Cart: 0Quantity:Price:$232.95Subtotal: -
Wiseco Piston Kit Honda TRX400EX 1999-2008 4606M08700
WISECO
$219.95If you're running a Honda TRX400EX, cylinder wear and stock piston limitations will eventually throttle your engine's potential. The Wiseco Piston Kit 4606M08700 restores combustion efficiency and...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
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal: -
Wiseco Piston Kit 88mm 11:1 Compression for Honda XR400R 1996-2004 4628M08800
WISECO
$244.95Factory pistons wear out—especially in high-demand riding conditions. This Wiseco piston kit restores lost compression and power while delivering the durability needed for both trail abuse and...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
$199.95If you're running a Yamaha XT350 or TT350, a worn or damaged piston directly impacts combustion efficiency, throttle response, and overall reliability. The Wiseco 4674M08600 replaces your factory...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
$199.95 -
Wiseco Piston Kit Yamaha XT350 1985-2000 87.50mm 9:1 4674M08750
WISECO
$184.95When your XT350 starts showing signs of wear—loss of compression, reduced throttle response, or visible piston scoring—a quality piston kit is essential to restore engine integrity and performance...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
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit 88.00mm Oversize Yamaha YZ490 1984-1990 546M08800
WISECO
$243.95If you're running a YZ490 and want to unlock real gains in compression ratio and top-end power, a quality oversize piston is non-negotiable. The Wiseco +1.00mm kit gives you the forged strength to...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
$243.95 -
Wiseco Piston 88.5mm Oversize Yamaha WR500Z 1992-1993 546M08850
WISECO
$244.95If you're pushing your Yamaha WR500Z or YZ490 to its limits, stock pistons won't cut it. The Wiseco +1.50mm oversize piston delivers the durability and power you need for serious trail and racing...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
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston 89mm +2mm Oversize for Yamaha YZ490 1984-1990 546M08900
WISECO
$244.95If you're running a Yamaha YZ490 or WR500 at the edge of its limits, factory pistons won't cut it. This Wiseco forged piston is built to withstand the punishment of competitive racing and aggressive...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
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit Honda CR500R 1984-2001 91.00mm 871M09100
WISECO
$255.95The Wiseco Piston Kit is engineered for Honda CR500R two-stroke engines that demand reliability at extreme RPM. This 91.00mm, 2.0mm oversize piston delivers improved combustion efficiency and...09102026- SKU:
- 09102026
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 91.00 MM
- DISPLACEMENT:
- 472 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 491 CC
$255.95 -
Wiseco Piston Kit 56.00 mm Bore Yamaha YZ125 2005-2021 845M05600
WISECO
$174.95If you're running a YZ125 and want measurable gains in displacement-dependent power and throttle response, a quality piston upgrade is one of the most direct paths forward. The Wiseco 56.00 mm piston...09100572- SKU:
- 09100572
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- DISPLACEMENT:
- 134 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit Standard 77mm 12.7:1 Compression Yamaha YZ250F 2001-2004 4872M07700
WISECO
$174.95The Wiseco Piston Kit delivers precision engineering where it matters most—inside your YZ250F's combustion chamber. A properly matched piston assembly is critical for maintaining compression ratios,...09100573- SKU:
- 09100573
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 77.00 MM
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal:
