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
-
VERTEX Piston Kit - Standard 22649B
VERTEX
$207.95All 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 life09100996- SKU:
- 09100996
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
$207.95 -
VERTEX Piston Kit - Standard 22909B
VERTEX
$206.95All 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 life09100998- SKU:
- 09100998
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$206.95 -
VERTEX Piston Kit 24188A
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 life, Forged pistons are forged from 2618 aluminum for...09104662- SKU:
- 09104662
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 95.96 MM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$268.95 -
VERTEX Piston Kit 24188B
VERTEX
$294.95All 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, Forged pistons are forged from 2618 aluminum for...09104663- SKU:
- 09104663
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 450 CC
- PISTON DIAMETER METRIC:
- 95.97 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
On Sale
VERTEX Piston Kit 24189A
VERTEX
MSRP: $322.95Now: $232.00Was: $322.95All 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, Forged pistons are forged from 2618 aluminum for...09104666- SKU:
- 09104666
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- GP RACER'S CHOICE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON DIAMETER METRIC:
- 95.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
MSRP: $322.95Now: $232.00Was: $322.95 -
VERTEX Piston Kit 24189B
VERTEX
$322.95All 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, Forged pistons are forged from 2618 aluminum for...09104667- SKU:
- 09104667
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$322.95 -
VERTEX Piston Kit 24267B
VERTEX
$237.95All 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...09105175- SKU:
- 09105175
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$237.95 -
VERTEX Piston Kit 24268B
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 life, Cast piston kits are gravity cast aluminum alloy (not...09105179- SKU:
- 09105179
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$268.95 -
VERTEX Piston Kit 24233C
VERTEX
$188.95All 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...09105185- SKU:
- 09105185
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- PISTON DIAMETER METRIC:
- 57.96 MM
- STYLE:
- CAST RACE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 144 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$188.95 -
VERTEX Piston Kit 24142A
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 life, Cast piston kits are gravity cast aluminum alloy (not...09105186- SKU:
- 09105186
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON DIAMETER METRIC:
- 80.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- DISPLACEMENT:
- 270 CC
- STYLE:
- FORGED BIG BORE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$303.95 -
VERTEX Piston Kit 24270B
VERTEX
$254.95All 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...09105192- SKU:
- 09105192
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$254.95 -
VERTEX Piston Kit - Stroker 23879A
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 life09103677- SKU:
- 09103677
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST STROKER
- CYLINDER DIAMETER METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 51.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 112 CC
- UNITS:
- KIT
$163.95 -
VERTEX Piston Kit VTKTC22983B
VERTEX
$287.95All 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 life09103725- SKU:
- 09103725
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
$287.95 -
VERTEX Piston Kit VTKTC23003B
VERTEX
$322.95All 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 life09103730- SKU:
- 09103730
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
$322.95 -
VERTEX Piston Kit VTKTC23003B-1
VERTEX
$322.95All 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 life09103731- SKU:
- 09103731
- Availability:
- Ships Same Business Day
- Weight:
- 1.57 LBS
$322.95 -
VERTEX Piston Kit - High Compression VTKTC23113B
VERTEX
$316.95All 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 life09103737- SKU:
- 09103737
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$316.95 -
VERTEX Piston Kit VTKTC23127A
VERTEX
$285.95All 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 life09103739- SKU:
- 09103739
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$285.95 -
VERTEX Piston Kit VTKTC23127B
VERTEX
$285.95All 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 life09103740- SKU:
- 09103740
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$285.95 -
VERTEX Piston Kit - High Compression VTKTC23236B
VERTEX
$352.95All 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 life09103746- SKU:
- 09103746
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$352.95 -
VERTEX Piston Kit VTKTC23562B
VERTEX
$335.95All 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 life09103779- SKU:
- 09103779
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
$335.95
