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 Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905
WISECO
$169.95Upgrade your Kawasaki engine with the WISECO Piston Kit, designed for optimal performance and durability. This complete kit includes everything you need for a successful top-end rebuild, ensuring your engine runs smoothly and efficiently. ...09031149- SKU:
- 09031149
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 48.95 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84.9 CC
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$169.95 -
Wiseco Top End Bearing 12x16x15.8 Kawasaki KFX50 2003-2009 B1000
WISECO
$23.99Engineered for performance, the WISECO Top End Bearing B1000 is crafted from a premium high-silicon aluminum alloy, ensuring exceptional strength and durability. Designed to meet the rigorous demands of high-speed engines, these bearings provide smooth...B1000- SKU:
- B1000
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 12 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- LENGTH METRIC:
- 15.8 MM
- OUTSIDE DIAMETER METRIC:
- 16 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- EACH
$23.99 -
Wiseco Top End Bearing for Suzuki LT250R QuadRacer 1985-1992 B1002
WISECO
$23.99Engineered for performance and durability, the WISECO Top End Bearing B1002 is crafted from a premium high-silicon aluminum alloy. This ensures exceptional strength and reliability, making it ideal for high-speed engine applications. Designed to meet...B1002- SKU:
- B1002
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- ALUMINUM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- OUTSIDE DIAMETER METRIC:
- 23 MM
- LENGTH METRIC:
- 23.8 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- EACH
$23.99 -
Wiseco Top End Bearing Yamaha YFZ350 Banshee 1987-2006 B1005
WISECO
$23.99Engineered for peak performance, the WISECO Top End Bearing B1005 is crafted from a premium high-silicon aluminum alloy, ensuring unparalleled strength and reliability. Designed to withstand the rigors of high-speed operation, these bearings are...B1005- SKU:
- B1005
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- LENGTH METRIC:
- 22.5 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 21 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 16 MM
- MATERIAL:
- SILICONE
$23.99 -
Wiseco Top End Bearing Kawasaki KX85 2001-2024 B1006
WISECO
$23.99Engineered for peak performance, the WISECO Top End Bearing B1006 is crafted from a premium high-silicon aluminum alloy, ensuring exceptional strength and reliability. Designed to meet the rigorous demands of high-speed engines, these bearings provide...B1006- SKU:
- B1006
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 17.5 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 14 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$23.99 -
Wiseco Top End Bearing 15x19x20 KTM 125 SX 1998-2021 B1013
WISECO
$23.99Engineered for performance, the WISECO Top End Bearing B1013 utilizes a high-silicon aluminum alloy, ensuring exceptional strength and reliability. These premium bearings are meticulously crafted to meet stringent standards, providing smooth operation...B1013- SKU:
- B1013
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 19.8 MM
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 19 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- INSIDE DIAMETER METRIC:
- 15 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
$23.99 -
Wiseco Top End Bearing Arctic Cat Cheetah 500 F/C 1986-1988 B1014
WISECO
$23.99Engineered for performance, the WISECO Top End Bearing B1014 is crafted from a premium high-silicon aluminum alloy, ensuring exceptional strength and reliability. These bearings are precision-manufactured to meet the highest industry standards, featuring...B1014- SKU:
- B1014
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- SILICONE
- LENGTH METRIC:
- 22 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 23 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$23.99 -
Wiseco Cam Chain Kawasaki KX450F 2006-2008 KLX450R 2008-2021 CC019
WISECO
$104.95Experience unparalleled performance with the WISECO Cam Chain CC019, expertly crafted from high-quality materials designed to minimize friction and extend longevity. This "M" style chain offers superior strength and reliability, ensuring your engine...09250319- SKU:
- 09250319
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- NUMBER OF LINKS:
- 124
- RIDING STYLE:
- STREET
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
$104.95 -
Wiseco Wrist Pin 19mm OD 47.5mm L Honda CRF450R 2009-2016 S682
WISECO
$23.99Engineered for precision and durability, the WISECO Wrist Pin S682 enhances performance by providing superior strength and minimal thermal expansion. This advanced component is designed to withstand extreme conditions, ensuring reliability and efficiency...09130012- SKU:
- 09130012
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- OUTSIDE DIAMETER METRIC:
- 19.00 MM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 19,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 62,1 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- LENGTH METRIC:
- 62.1 MM
- UNITS:
- EACH
$23.99 -
Wiseco Wrist Pin for 2009 KTM 50 SX Mini S563
WISECO
$22.99The WISECO Wrist Pin S563 is engineered for optimal performance and durability, making it the perfect choice for high-performance engines. Its advanced manufacturing techniques provide exceptional strength and reduced thermal expansion, ensuring...09130014- SKU:
- 09130014
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH METRIC:
- 37.80 MM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- LENGTH:
- 37,80 MM
- MATERIAL:
- SILICONE
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 12,00 MM
- OUTSIDE DIAMETER METRIC:
- 12.00 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$22.99 -
Wiseco Crankshaft Kit Yamaha YZ125 2005-2021 WPC163
WISECO
$384.95The WISECO Crankshaft WPC163 offers a comprehensive solution for your engine needs, combining precision engineering with top-quality materials. This all-in-one kit includes everything necessary for a seamless installation, ensuring optimal performance...09210549- SKU:
- 09210549
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$384.95 -
Wiseco Crankshaft Kit Kawasaki KX85 2006-2013 WPC164
WISECO
$344.95Upgrade your engine's performance with the WISECO Crankshaft WPC164, designed for precision and durability. This all-in-one kit includes everything you need for a complete overhaul, ensuring optimal functionality and reliability for your machine. ...09210550- SKU:
- 09210550
- Availability:
- Ships Same Business Day
- Weight:
- 6.25 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
$344.95 -
Wiseco Crankshaft Kit 2003-2004 Suzuki RM250 WPC165A
WISECO
$479.95Upgrade your engine's performance with the WISECO Crankshaft WPC165A. This comprehensive crankshaft kit comes fully assembled to OEM specifications, ensuring precision and reliability. Designed with advanced engineering, it delivers superior strength and...09210551- SKU:
- 09210551
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$479.95 -
Wiseco Suzuki RM85 2002-2020 Crankshaft WPC166
WISECO
$364.95Experience unmatched performance with the WISECO Crankshaft WPC166, designed for precision and durability. This comprehensive crankshaft kit ensures a seamless installation, providing everything you need for a reliable engine rebuild. Complete kit...09210553- SKU:
- 09210553
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- STROKE LENGTH METRIC:
- 46.80 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$364.95 -
Wiseco Engine Rebuild Kit 2002-2023 Suzuki RM85 PWR166-100
WISECO
$464.95The WISECO Engine Rebuild Kit PWR166-100 provides everything you need for a comprehensive engine overhaul. Designed for both performance and longevity, this kit ensures your engine runs smoothly with high-quality components tailored for 4-stroke and...09031618- SKU:
- 09031618
- Availability:
- Ships Same Business Day
- Weight:
- 8.20 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$464.95 -
Wiseco Engine Rebuild Kit 52.00mm Bore for 2006-2011 KTM 105 SX PWR176-100
WISECO
$519.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR176-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures your engine performs at its best, featuring premium components for reliability and longevity. ...09031622- SKU:
- 09031622
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$519.95Qty in Cart: 0Quantity:Price:$519.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2005-2007 54mm Bore PWR177-100
WISECO
$554.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR177-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures your engine runs smoothly and efficiently with premium components tailored for durability and...09031623- SKU:
- 09031623
- Availability:
- Ships Same Business Day
- Weight:
- 9.95 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$554.95 -
Wiseco Engine Rebuild Kit for 2013-2017 KTM 85 SX 17/14 PWR178-100
WISECO
$679.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR178-100, 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...09031624- SKU:
- 09031624
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$679.95 -
Wiseco Engine Rebuild Kit for Honda CR250R 2002-2004 PWR132-100
WISECO
$659.95Revitalize your CR250 with the WISECO Engine Kit, meticulously crafted for 2002-2004 models. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring top performance and reliability. Designed for durability, each...09031517- SKU:
- 09031517
- Availability:
- Ships Same Business Day
- Weight:
- 12.85 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$659.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ125 2005-2020 PWR163-100
WISECO
$529.95The WISECO Engine Kit for YZ125 offers a comprehensive solution for a complete engine rebuild, ensuring your bike runs like new. Each component is meticulously designed and tested for maximum durability and performance, making it the ideal choice for...09031541- SKU:
- 09031541
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$529.95
