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 23384400
VERTEX
$193.95All 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 life09102540- SKU:
- 09102540
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$193.95 -
VERTEX Piston Kit 22356A
VERTEX
$193.95All 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 life09102541- SKU:
- 09102541
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 67.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$193.95 -
VERTEX Piston Kit 22584A
VERTEX
$169.95All 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...09102542- SKU:
- 09102542
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$169.95 -
VERTEX Piston Kit 22600B
VERTEX
$177.95All 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...09102543- SKU:
- 09102543
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$177.95 -
VERTEX Piston Kit 22601B
VERTEX
$218.95All 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...09102544- SKU:
- 09102544
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.95 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$218.95 -
VERTEX Piston Kit 22926C
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 life09102547- SKU:
- 09102547
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.96 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
$206.95 -
VERTEX Piston Kit 23235B
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 life09102549- SKU:
- 09102549
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$280.95Qty in Cart: 0Quantity:Price:$280.95Subtotal: -
Wiseco Piston Honda CRF450R 2002-2008 96mm 12.5:1 449cc 4780M10100
WISECO
$134.95Transform your riding experience with the Wiseco Piston Kit, designed for those who demand exceptional performance and reliability. This piston kit not only enhances your engine's power but also ensures optimal efficiency, making it a must-have for any...450M05000- SKU:
- 450M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 49.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$134.95 -
Wiseco Piston Kit Yamaha YZ450F 2014-2017 12.5:1 97mm 40111M09700
WISECO
$239.95Wiseco Piston Kit - 40111M09700 Elevate your Yamaha's performance with the Wiseco Piston Kit. Designed for enthusiasts who demand the best, this kit enhances power output and engine efficiency, ensuring a thrilling ride every time. Experience the perfect...09103910- SKU:
- 09103910
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 60.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 97.00 MM
- DISPLACEMENT:
- 449 CC
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit 44.5mm for Kawasaki KX65 2000-2026 RE919M04450
WISECO
$139.95Unleash the full potential of your bike with the Wiseco Racer Elite Piston Kit, meticulously crafted for riders seeking unmatched performance and reliability. This kit is designed to thrive in the toughest conditions, delivering superior power and...09105087- SKU:
- 09105087
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
$139.95 -
Wiseco Piston Kit 2014-2025 Kawasaki KX85 48.5mm RE924M04850
WISECO
$134.95Wiseco Racer Elite Piston Kit - RE924M04850 Elevate your Kawasaki KX85's performance with the cutting-edge Wiseco Racer Elite Piston Kit. Crafted for riders seeking exceptional power and reliability, this piston kit combines advanced technology with...09105088- SKU:
- 09105088
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 48.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
$134.95 -
Wiseco Piston Kit 75.50mm 10.5:1 Compression Honda XR250R 1984-1985 4329M07550
WISECO
$194.95Transform your Honda XL250R or XR250R into a powerhouse with the Wiseco Piston Kit. Engineered for enthusiasts who demand peak performance, this kit combines advanced technology with unmatched durability, ensuring your engine operates at its finest...4329M07550- SKU:
- 4329M07550
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PISTON DIAMETER METRIC:
- 75.45 MM
- STROKE LENGTH METRIC:
- 56.50 MM
$194.95 -
Wiseco Piston Kit 1995-2021 Kawasaki KX100 52.5mm RE907M05250
WISECO
$139.95Unlock the full potential of your Kawasaki KX100 with the Wiseco Racer Elite Piston Kit. Designed for high-performance 2-stroke engines, this kit combines cutting-edge technology with superior materials to enhance your bike's power and reliability...09105092- SKU:
- 09105092
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
$139.95 -
Wiseco Piston Kit 92.50mm 10.25:1 Honda XR500R 1983-1984 4330M09250
WISECO
$239.95Unlock the true performance of your Honda XR500R with the Wiseco Piston Kit, designed for riders who demand excellence on every ride. This high-performance piston ensures your engine runs smoothly and efficiently, whether you're navigating rugged trails...4330M09250- SKU:
- 4330M09250
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 92.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- DISPLACEMENT:
- 498 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 75.00 MM
- PISTON DIAMETER METRIC:
- 92.45 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$239.95 -
Wiseco Piston Kit with Gaskets for 2003-2004 Yamaha YZ125 PK1347
WISECO
$229.95Transform your riding experience with the Wiseco Piston Kit, meticulously engineered to enhance the performance of your Yamaha YZ125. This kit combines cutting-edge technology with durable materials, ensuring you achieve optimal power and reliability on...09030250- SKU:
- 09030250
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$229.95 -
Wiseco Suzuki RM125 1991-1996 Piston Kit with Gaskets PK1320
WISECO
$209.95Unlock the full potential of your Suzuki RM125 with the Wiseco Piston Kit PK1320. This high-performance kit is meticulously crafted to deliver exceptional power and reliability, making it ideal for both competitive racing and adventurous trail riding...09030256- SKU:
- 09030256
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 123 CC
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 54.96 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 55.00 MM
- PRODUCT NAME:
- REBUILD KIT
$209.95 -
Wiseco Piston Kit with Gaskets for Kawasaki KX80 1988-1990 PK1296
WISECO
$179.95Transform your Kawasaki KX80 with the high-performance Wiseco Piston Kit. Designed for both competitive racing and off-road adventures, this kit enhances your engine's power and reliability, ensuring you stay ahead on any terrain. Premium High-Silicon...09030261- SKU:
- 09030261
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$179.95 -
Wiseco Piston Kit with Gaskets for 1986-2004 Honda XR250R PK1219
WISECO
$229.95Unleash your bike's true potential with the Wiseco Piston Kit PK1219. This meticulously engineered kit is crafted to optimize performance and reliability, making it the perfect upgrade for serious riders. Experience a noticeable boost in power and...09030265- SKU:
- 09030265
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PISTON DIAMETER METRIC:
- 72.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE SIZE METRIC:
- 73.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$229.95 -
Wiseco Piston Kit 66mm Honda CR250R 1984-1985 526M06600
WISECO
$204.95Unlock unparalleled performance with the Wiseco Piston Kit, meticulously engineered to elevate your riding experience. Perfect for both competitive racing and rugged trails, this premium kit is built to endure and excel under pressure, ensuring your...526M06600- SKU:
- 526M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Piston Kit 66.25mm Bore for 1985-1986 Honda ATC 250R 526M06625
WISECO
$204.95Unlock the full potential of your Honda with the Wiseco Piston Kit, designed for optimum performance and reliability. Whether you're tackling rugged trails or competing on the track, this piston kit enhances your engine's power and efficiency, ensuring...526M06625- SKU:
- 526M06625
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.25 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +0.25 MM
- DISPLACEMENT:
- 248 CC
- STROKE LENGTH METRIC:
- 72.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$204.95
