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 - High Compression VTKTC23647A
VERTEX
$348.95When you're building or rebuilding an engine, piston quality directly impacts power delivery, reliability, and longevity under sustained load. The VERTEX Piston Kit VTKTC23647A delivers the...09103799- SKU:
- 09103799
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
$348.95Qty in Cart: 0Quantity:Price:$348.95Subtotal: -
VERTEX Piston Kit VTKTC23855A
VERTEX
$319.95A quality piston kit is the foundation of any reliable high-performance build—VERTEX delivers the durability and precision demanded by serious racers and builders. The T-5 heat treatment and...09103802- SKU:
- 09103802
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
$319.95Qty in Cart: 0Quantity:Price:$319.95Subtotal: -
VERTEX Piston Kit - High Compression VTKTC23855B
VERTEX
$354.95If you're building a high-compression engine that demands reliability under sustained load, the VERTEX Piston Kit VTKTC23855B delivers the durability and precision required for serious racing...09103803- SKU:
- 09103803
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
$354.95 -
On Sale
VERTEX Piston Kit 23679B
VERTEX
MSRP: $236.95Now: $152.00Was: $236.95A piston kit is only as reliable as its material composition and heat treatment—factors that directly impact engine longevity under sustained high RPM and boost conditions. The VERTEX Piston Kit...09102585- SKU:
- 09102585
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- PRODUCT NAME:
- PISTON KIT
MSRP: $236.95Now: $152.00Was: $236.95Qty in Cart: 0Quantity:Price:MSRP: $236.95Now: $152.00Was: $236.95Subtotal: -
VERTEX Piston Kit 23711A
VERTEX
$302.95Whether you're rebuilding a tired engine or pushing higher compression ratios for competition, the VERTEX Piston Kit 23711A delivers the durability and precision needed for reliable power across the...09102593- SKU:
- 09102593
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Kit 23653B
VERTEX
$315.95Whether you're rebuilding a two-stroke or four-stroke engine, piston selection directly impacts durability, power delivery, and longevity under sustained load. The VERTEX Piston Kit 23653B delivers...09102040- SKU:
- 09102040
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +3.20 MM
- CYLINDER DIAMETER METRIC:
- 80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +3,20 MM
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- DISPLACEMENT:
- 270 CC
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$315.95Qty in Cart: 0Quantity:Price:$315.95Subtotal: -
VERTEX Piston Kit 23637B
VERTEX
$171.95The VERTEX Piston Kit 23637B delivers reliable, high-performance pistons engineered for extended engine life and consistent power delivery. Whether you're rebuilding a worn top end or upgrading to...09102048- SKU:
- 09102048
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 48.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$171.95 -
VERTEX Piston Kit VTK22863B-1
VERTEX
$150.95A piston kit is the heart of your engine's combustion cycle—and VERTEX engineered the VTK22863B-1 to deliver the reliability and precision that separates consistent power from catastrophic failure...09103027- SKU:
- 09103027
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- PRODUCT NAME:
- TOP END PISTON KIT
$150.95 -
VERTEX Piston Kit VTKTC23003A
VERTEX
$341.95Piston failure cuts racing short and empties wallets fast. The VERTEX Piston Kit VTKTC23003A delivers the durability and precision needed for sustained high-RPM performance, with advanced metallurgy...09103727- SKU:
- 09103727
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$341.95Qty in Cart: 0Quantity:Price:$341.95Subtotal: -
VERTEX Piston Kit - Standard 23375B
VERTEX
$254.95Engine durability and longevity depend on pistons that can withstand extreme combustion pressures and thermal cycling without compromise. The VERTEX Piston Kit 23375B delivers the precision...09101002- SKU:
- 09101002
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$254.95 -
VERTEX Piston Kit - Standard 23429CD
VERTEX
$99.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 23429CD delivers the durability required for sustained boost and aggressive tuning. Built...09102065- SKU:
- 09102065
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
VERTEX Piston Kit 24101B
VERTEX
$223.95The VERTEX Piston Kit 24101B delivers the reliability and performance precision you need for consistent power delivery across the entire RPM range. Whether you're rebuilding a tired top end or...09104071- SKU:
- 09104071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 57.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 58 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- CAST REPLICA
$223.95 -
VERTEX Piston Kit - Standard 22646B
VERTEX
$235.95The VERTEX Piston Kit 22646B delivers the durability and precision your engine demands, whether you're chasing lap times or building a reliable long-term platform. Purpose-engineered with advanced...09100951- SKU:
- 09100951
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- PISTON DIAMETER METRIC:
- 66.35 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit - Standard 22387B
VERTEX
$208.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Piston Kit 22387B delivers the durability and precision you need for consistent power delivery and extended...09101032- SKU:
- 09101032
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 23335B
VERTEX
$189.95A piston kit is only as good as its material composition and heat treatment process—this VERTEX 23335B delivers both. These pistons are engineered to handle sustained high-RPM loads and thermal...09102117- SKU:
- 09102117
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED RACE
- BORE - OVERSIZE:
- +4,00 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON DIAMETER METRIC:
- 57.96 MM
- PRODUCT NAME:
- PISTON KIT
$189.95 -
Wiseco Piston Kit Suzuki RM-Z250 2010-2024 40007M07700
WISECO
$224.95The Wiseco 40007M07700 Piston Kit delivers the compression ratio and durability needed to unlock your RM-Z250's full potential, whether you're pushing hard on the track or tackling demanding terrain...09102888- SKU:
- 09102888
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Yamaha DT250 1974-1979 234M07000
WISECO
$210.95If you're running a Yamaha DT250 and want to reliably extract more power from your 2-stroke, a quality piston kit is non-negotiable. The Wiseco 234M07000 delivers the precision fit and durability you...234M07000- SKU:
- 234M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 64.00 MM
$210.95 -
Wiseco Piston Honda CRF450R 2002-2008 4171M07500
WISECO
$194.95The Wiseco 4171M07500 piston kit delivers the compression ratio and material durability your CRF450R needs to handle sustained high-RPM demands, whether you're pushing hard on the track or tackling...4171M07500- SKU:
- 4171M07500
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON DIAMETER METRIC:
- 74.95 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 75.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 248 CC
- SKIRT COATING:
- NON-COATED
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 57.80 MM
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
Wiseco Piston Kit Standard Bore 55.94mm Honda CR125M 1974-1978 339M05600
WISECO
$154.95If you're running a Honda CR125M two-stroke, piston wear is inevitable—and when it happens, you need a direct replacement that matches OEM specifications without compromising performance. The Wiseco...339M05600- SKU:
- 339M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 55.94 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco 67mm Piston Kit for Yamaha YT175 1982-1983 471M06700
WISECO
$154.95Your YT175's performance ceiling is directly tied to your piston's precision and durability. A worn or undersized piston compromises compression, throttle response, and engine longevity—especially in...471M06700- SKU:
- 471M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 172 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 66.95 MM
- SKIRT COATING:
- NON-COATED
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal:
