Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
Wiseco Engine Rebuild Kit for 2003-2004 Honda CR85R PWR115-103
WISECO
MSRP: $464.95Now: $395.00Was: $464.95Revitalize your CR85R with the complete WISECO Engine Kit, meticulously designed for a flawless rebuild. This kit ensures your engine performs at its peak with high-quality components that guarantee durability and reliability on the track. ...09031495- SKU:
- 09031495
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
MSRP: $464.95Now: $395.00Was: $464.95 -
On Sale
Wiseco Engine Rebuild Kit for Yamaha YZ80 1993-2001 PWR122-100
WISECO
MSRP: $474.95Now: $404.00Was: $474.95Revitalize your YZ80 with the WISECO Engine Kit, designed for a comprehensive rebuild that enhances performance and reliability. This all-inclusive kit ensures your engine operates at peak efficiency, featuring meticulously crafted components that meet...09031502- SKU:
- 09031502
- Availability:
- Ships Same Business Day
- Weight:
- 7.80 LBS
- DISPLACEMENT:
- 80 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 47.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $474.95Now: $404.00Was: $474.95Qty in Cart: 0Quantity:Price:MSRP: $474.95Now: $404.00Was: $474.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 1998-2000 Yamaha YZ125 PWR124-100
WISECO
MSRP: $539.95Now: $459.00Was: $539.95Revitalize your YZ125 with the WISECO Engine Kit, specifically designed for models from 1998 to 2000. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring optimal performance and longevity. Complete top...09031504- SKU:
- 09031504
- Availability:
- Ships Same Business Day
- Weight:
- 9.70 LBS
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $539.95Now: $459.00Was: $539.95Qty in Cart: 0Quantity:Price:MSRP: $539.95Now: $459.00Was: $539.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit Yamaha YZ125 2002 PWR125-101
WISECO
MSRP: $534.95Now: $455.00Was: $534.95Revitalize your YZ125 with the WISECO Engine Kit, meticulously engineered for a complete top and bottom-end rebuild. This comprehensive kit ensures your engine operates at peak performance with components that guarantee durability and reliability. ...09031506- SKU:
- 09031506
- Availability:
- Ships Same Business Day
- Weight:
- 9.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $534.95Now: $455.00Was: $534.95Qty in Cart: 0Quantity:Price:MSRP: $534.95Now: $455.00Was: $534.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit Yamaha YZ250 2002 PWR127-101
WISECO
MSRP: $649.95Now: $552.00Was: $649.95Revitalize your YZ250 with the comprehensive WISECO Engine Kit, expertly crafted for a complete engine rebuild. This kit ensures optimal performance and longevity with high-quality components that have undergone rigorous inspection and testing. ...09031510- SKU:
- 09031510
- Availability:
- Ships Same Business Day
- Weight:
- 13.00 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- OVERBORE METRIC:
- STANDARD
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $649.95Now: $552.00Was: $649.95Qty in Cart: 0Quantity:Price:MSRP: $649.95Now: $552.00Was: $649.95Subtotal: -
On Sale
Wiseco Engine Kit for Kawasaki KX250 1993 PWR128-102
WISECO
MSRP: $669.95Now: $569.00Was: $669.95Revitalize your KX250 with the WISECO Engine Kit, specifically designed for models from 1993 to 2001. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring enhanced performance and reliability on every ride. ...09031511- SKU:
- 09031511
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $669.95Now: $569.00Was: $669.95 -
On Sale
Wiseco Engine Rebuild Kit for Kawasaki KX60 1985-2003 PWR130-100
WISECO
MSRP: $459.95Now: $391.00Was: $459.95Revitalize your KX60 with the WISECO Engine Kit, designed for a comprehensive rebuild that ensures peak performance. This kit includes meticulously inspected components for both the top and bottom end, providing everything you need for a seamless...09031512- SKU:
- 09031512
- Availability:
- Ships Same Business Day
- Weight:
- 14.83 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 60 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 43.00 MM
- FEATURES:
- STANDARD PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
MSRP: $459.95Now: $391.00Was: $459.95Qty in Cart: 0Quantity:Price:MSRP: $459.95Now: $391.00Was: $459.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for Suzuki RM125 2004-2008 PWR135-100
WISECO
MSRP: $564.95Now: $480.00Was: $564.95Revitalize your RM125 with the WISECO Engine Kit, specifically designed for models from 2004 to 2010. This comprehensive kit provides everything needed for a complete engine rebuild, ensuring optimal performance and reliability. With meticulously...09031520- SKU:
- 09031520
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
MSRP: $564.95Now: $480.00Was: $564.95Qty in Cart: 0Quantity:Price:MSRP: $564.95Now: $480.00Was: $564.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit Honda CRF250R 2004-2007 PWR143-100
WISECO
MSRP: $889.95Now: $756.00Was: $889.95Revitalize your CRF250 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes high-quality components meticulously crafted to enhance performance and reliability, ensuring your bike runs smoothly on any terrain. ...09031531- SKU:
- 09031531
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
MSRP: $889.95Now: $756.00Was: $889.95 -
On Sale
Wiseco Engine Rebuild Kit Yamaha YZ450F 2006-2009 PWR151-100
WISECO
MSRP: $994.95Now: $846.00Was: $994.95Revitalize your YZ450F with the WISECO Engine Kit, offering everything you need for a complete engine rebuild. Designed for durability and performance, this comprehensive kit ensures your bike runs smoothly and efficiently on every ride. Complete...09031535- SKU:
- 09031535
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
MSRP: $994.95Now: $846.00Was: $994.95 -
On Sale
Wiseco Engine Rebuild Kit KTM 125 SX 2007-2015 PWR153-102
WISECO
MSRP: $664.95Now: $565.00Was: $664.95Revitalize your KTM/TC125 with the WISECO Engine Kit, meticulously crafted for a seamless rebuild experience. This comprehensive kit includes all essential components for both top and bottom-end repairs, ensuring your engine operates at peak performance...09031536- SKU:
- 09031536
- Availability:
- Ships Same Business Day
- Weight:
- 10.65 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $664.95Now: $565.00Was: $664.95Qty in Cart: 0Quantity:Price:MSRP: $664.95Now: $565.00Was: $664.95Subtotal: -
On Sale
Wiseco Steel Valve Kit Honda CRF450R 2002-2006 SVKB1403
WISECO
MSRP: $344.95Now: $293.00Was: $344.95The WISECO Valve Kit SVKB1403 is a comprehensive solution designed to enhance your engine's performance. This kit includes high-quality intake and exhaust valves, paired with precision-engineered springs that ensure optimal functionality and longevity...09263061- SKU:
- 09263061
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $344.95Now: $293.00Was: $344.95 -
On Sale
Wiseco Valve Kit 2007-2008 Honda CRF450R SVKB1404
WISECO
MSRP: $344.95Now: $293.00Was: $344.95Enhance your engine's performance with the WISECO Valve Kit SVKB1404, a comprehensive solution featuring precision-engineered valves and springs for both intake and exhaust systems. Crafted from high-quality materials, this kit ensures optimal...09263062- SKU:
- 09263062
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
MSRP: $344.95Now: $293.00Was: $344.95Qty in Cart: 0Quantity:Price:MSRP: $344.95Now: $293.00Was: $344.95Subtotal: -
On Sale
Wiseco Valve Kit for 2010-2013 Yamaha YZ450F SVKB2440
WISECO
MSRP: $344.95Now: $293.00Was: $344.95Enhance your engine's performance with the WISECO Valve Kit SVKB2440, designed for both intake and exhaust applications. This comprehensive kit features high-quality steel valves and precision-engineered springs, ensuring optimal performance and...09263068- SKU:
- 09263068
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
MSRP: $344.95Now: $293.00Was: $344.95Qty in Cart: 0Quantity:Price:MSRP: $344.95Now: $293.00Was: $344.95Subtotal: -
On Sale
Wiseco 65.5mm Piston Ring Set for Honda ATC185 1980 2579XC
WISECO
MSRP: $49.95Now: $42.00Was: $49.95Enhance your engine's performance with the WISECO Ring Set 2579XC, meticulously designed for precision and durability. Each set is tailored for a single piston, ensuring optimal fit and function to elevate your vehicle's efficiency. Trust in WISECO's...2579XC- SKU:
- 2579XC
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 65.50 MM
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 191,8 CC
- UNITS:
- SET
- DISPLACEMENT:
- 199 CC
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
Wiseco Ring Set 66.50mm Honda ATC185 1980 2618XC
WISECO
MSRP: $49.95Now: $42.00Was: $49.95The WISECO Ring Set 2618XC is engineered for high-performance applications, providing exceptional durability and reliability. Each set is designed to fit one piston, ensuring a precise fit and optimal function. Upgrade your engine's performance with...2618XC- SKU:
- 2618XC
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- SET
- DISPLACEMENT:
- 192 CC
- BORE SIZE METRIC:
- 66.50 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
Wiseco Piston Ring Set 55mm Bore for 1985-1986 Honda CR125R 1985-1986 Suzuki RM125 2165CD
WISECO
MSRP: $49.95Now: $42.00Was: $49.95The WISECO Ring Set 2165CD is expertly designed to enhance the performance and longevity of your engine. Each set is specifically tailored for one piston, ensuring optimal fit and functionality. Upgrade your engine's efficiency and reliability with this...2165CD- SKU:
- 2165CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
MSRP: $49.95Now: $42.00Was: $49.95Qty in Cart: 0Quantity:Price:MSRP: $49.95Now: $42.00Was: $49.95Subtotal: -
On Sale
Wiseco 87mm Piston Ring Set for Kawasaki KX500 1988-2004 3425TD
WISECO
MSRP: $54.95Now: $47.00Was: $54.95The WISECO Ring Set 3425TD is engineered for optimal performance and durability, designed specifically for a single piston. Each set ensures a precise fit and reliable sealing, enhancing engine efficiency and longevity. High-quality materials for...3425TD- SKU:
- 3425TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- SET
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $54.95Now: $47.00Was: $54.95Qty in Cart: 0Quantity:Price:MSRP: $54.95Now: $47.00Was: $54.95Subtotal: -
On Sale
Wiseco 84mm Piston Ring Set for Polaris Sport 400 1994-2000 3307TD
WISECO
MSRP: $54.95Now: $47.00Was: $54.95The WISECO Ring Set 3307TD is engineered for optimal performance, ensuring your piston operates at peak efficiency. Designed for durability and precision, this ring set enhances engine reliability and longevity. Perfect for high-performance applications,...3307TD- SKU:
- 3307TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- BORE SIZE METRIC:
- 84.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
MSRP: $54.95Now: $47.00Was: $54.95Qty in Cart: 0Quantity:Price:MSRP: $54.95Now: $47.00Was: $54.95Subtotal: -
On Sale
Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets PK1215
WISECO
MSRP: $169.95Now: $144.00Was: $169.95Elevate your Honda CR125R's performance with the Wiseco Piston Kit. Designed for enthusiasts who demand the best, this kit combines advanced engineering with top-notch materials to ensure your bike delivers unmatched power and reliability on every ride...09030670- SKU:
- 09030670
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 84.7 CC
- PISTON DIAMETER METRIC:
- 47.95 MM
MSRP: $169.95Now: $144.00Was: $169.95Qty in Cart: 0Quantity:Price:MSRP: $169.95Now: $144.00Was: $169.95Subtotal:
