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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Wiseco Crankshaft Kit with Gasket 2001-2015 KTM 125 SX WPC153
WISECO
$569.95The WISECO Crankshaft Kit with Gasket WPC153 is engineered for high performance and reliability. This comprehensive kit includes everything you need for a complete overhaul, ensuring your engine runs smoothly and efficiently. With precision manufacturing...09210434- SKU:
- 09210434
- Availability:
- Ships Same Business Day
- Weight:
- 9.97 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- STROKE LENGTH METRIC:
- 54.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$569.95 -
Wiseco Engine Rebuild Kit for 1992-1996 Honda CR250R PWR101-100
WISECO
$659.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR101-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring optimal performance and longevity...09031596- SKU:
- 09031596
- Availability:
- Ships Same Business Day
- Weight:
- 14.10 LBS
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$659.95 -
Wiseco Engine Rebuild Kit for Honda CR125R 1992-1997 PWR116A-101
WISECO
$549.95Transform your engine with the WISECO Engine Rebuild Kit PWR116A-101, designed for both 4-stroke and 2-stroke applications. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring peak performance and reliability...09031600- SKU:
- 09031600
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$549.95Qty in Cart: 0Quantity:Price:$549.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2001-2002 PWR116A-104
WISECO
$554.95Revitalize your CR125 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes meticulously crafted components to ensure optimal performance and reliability, making it perfect for both enthusiasts and competitive riders...09031496- SKU:
- 09031496
- Availability:
- Ships Same Business Day
- Weight:
- 4.35 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- UNITS:
- KIT
$554.95 -
Wiseco Engine Kit for Kawasaki KX65 2000-2005 PWR117-100
WISECO
$459.95Revitalize your KX65 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit ensures optimal performance and longevity, featuring meticulously inspected components for reliability and strength. Complete top and bottom-end...09031497- SKU:
- 09031497
- Availability:
- Ships Same Business Day
- Weight:
- 7.40 LBS
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 44.50 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$459.95 -
Wiseco Engine Rebuild Kit Kawasaki KX100 1998-2005 PWR119-102
WISECO
$479.95Revitalize your KX100 with the WISECO Engine Kit, meticulously crafted for a complete engine rebuild. This kit ensures optimal performance and longevity, featuring high-quality components that have been rigorously inspected for durability. ...09031499- SKU:
- 09031499
- Availability:
- Ships Same Business Day
- Weight:
- 8.00 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 52.50 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 100 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$479.95 -
Wiseco Engine Rebuild Kit Kawasaki KX85 2001-2005 PWR119-104
WISECO
$469.95Revitalize your KX85 with the WISECO Engine Kit, engineered for unparalleled performance and reliability. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring your bike runs at its best. Designed with precision, the...09031500- SKU:
- 09031500
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
$469.95 -
Wiseco Engine Rebuild Kit for 2001-2003 Suzuki RM125 PWR121-100
WISECO
$529.95Revitalize your RM125 with the WISECO Engine Kit, specifically designed for models from 2001 to 2003. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring peak performance and reliability. With rigorous...09031501- SKU:
- 09031501
- Availability:
- Ships Same Business Day
- Weight:
- 10.30 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$529.95 -
Wiseco Engine Rebuild Kit Yamaha YZ85 2002-2018 PWR123-100
WISECO
$454.95Revitalize your YZ85 with the WISECO Engine Kit, expertly crafted for a complete engine rebuild. This comprehensive kit ensures optimal performance and longevity, featuring meticulously inspected components for reliable power delivery. Complete top...09031503- SKU:
- 09031503
- Availability:
- Ships Same Business Day
- Weight:
- 7.60 LBS
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$454.95 -
Wiseco Engine Rebuild Kit for 2001 Yamaha YZ125 PWR125-100
WISECO
$539.95Revitalize your YZ125 with the WISECO Engine Kit, meticulously crafted for a complete engine rebuild. This comprehensive kit ensures top performance and durability, featuring a precision-engineered crankshaft and rod assembly, alongside essential...09031505- SKU:
- 09031505
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
$539.95 -
Wiseco Engine Rebuild Kit Yamaha YZ125 2003-2004 PWR125-102
WISECO
$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 performs at its peak, featuring high-quality components that guarantee durability and...09031507- SKU:
- 09031507
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
$534.95 -
Wiseco Engine Rebuild Kit Yamaha YZ250 1999-2000 PWR126-100
WISECO
$644.95This comprehensive engine kit is designed specifically for the YZ250 models from 1999 to 2000, providing everything you need for a complete rebuild. With a focus on quality and performance, the kit includes meticulously inspected crankshaft and rod...09031508- SKU:
- 09031508
- 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
$644.95Qty in Cart: 0Quantity:Price:$644.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250 2001 PWR127-100
WISECO
$644.95Revitalize your YZ250 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes meticulously inspected components to ensure peak performance and longevity, making it the perfect choice for both enthusiasts and...09031509- SKU:
- 09031509
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$644.95 -
Wiseco Engine Rebuild Kit Honda CRF450R 2002-2006 PWR138-100
WISECO
$974.95Revitalize your CRF450 with the WISECO Engine Kit, expertly designed for a complete engine rebuild. This comprehensive kit includes high-quality components that ensure optimal performance and longevity, making it the perfect choice for both casual riders...09031524- SKU:
- 09031524
- Availability:
- Ships Same Business Day
- Weight:
- 15.40 LBS
$974.95 -
Wiseco Engine Rebuild Kit for 2007 Honda CRF450R PWR138-101
WISECO
$974.95Revitalize your CRF450 with the WISECO Engine Kit, meticulously engineered for a comprehensive rebuild. This all-inclusive package ensures your engine operates at peak performance, featuring high-quality components designed for durability and reliability...09031525- SKU:
- 09031525
- Availability:
- Ships Same Business Day
- Weight:
- 15.05 LBS
$974.95 -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2003-2005 PWR139-100
WISECO
$969.95Revitalize your YZ450 with the WISECO Engine Kit, meticulously engineered for optimal performance and longevity. This comprehensive kit includes all essential top and bottom-end components, ensuring a seamless engine rebuild that meets the highest...09031526- SKU:
- 09031526
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
$969.95 -
Wiseco Engine Rebuild Kit for 2003-2004 Yamaha YZ250F PWR140-100
WISECO
$889.95Revitalize your YZ250F with the WISECO Engine Kit, meticulously designed for a comprehensive rebuild. This kit includes high-quality components to ensure your engine performs at its best, featuring a durable crankshaft and rod assembly that guarantees...09031527- SKU:
- 09031527
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$889.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ250F 2005-2007 PWR140-101
WISECO
$889.95Revitalize your YZ250F with the WISECO Engine Kit, meticulously crafted to ensure peak performance and reliability. This comprehensive kit includes everything you need for a full engine rebuild, guaranteeing both durability and efficiency in every ride...09031528- SKU:
- 09031528
- Availability:
- Ships Same Business Day
- Weight:
- 11.35 LBS
$889.95 -
Wiseco Engine Rebuild Kit Yamaha YZ250F 2008-2011 PWR140-102
WISECO
$894.95Revitalize your YZ250F with the WISECO Engine Kit, designed for a comprehensive rebuild with top-quality components. This kit ensures optimal performance and longevity, featuring a meticulously crafted crankshaft and rod assembly, along with essential...09031529- SKU:
- 09031529
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$894.95 -
Wiseco Engine Rebuild Kit for 2006 Kawasaki KX250F PWR144-101
WISECO
$884.95Revitalize your KX250F with the WISECO Engine Kit, specifically designed for the 2006 model. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring optimal performance and reliability on the track. Complete top...09031532- SKU:
- 09031532
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$884.95
