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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VESRAH Exhaust Valve GG-1023-EX
VESRAH
$27.17A worn or damaged exhaust valve compromises combustion efficiency, reducing power output and increasing emissions. The VESRAH GG-1023-EX is precision-manufactured to OEM specifications, ensuring reliable sealing and thermal stability under sustained...09260049- SKU:
- 09260049
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER:
- 20,00 MM
- LENGTH METRIC:
- 65.40 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 5.00 MM
- HEAD DIAMETER METRIC:
- 20.00 MM
- RIDING STYLE:
- OFF-ROAD
$27.17 -
VESRAH Exhaust Gasket VE-3003
VESRAH
$50.98Exhaust gasket failure leads to performance loss, increased emissions, and costly heat damage to surrounding components. The VESRAH VE-3003 delivers a reliable, cost-effective seal that maintains back-pressure integrity and prevents exhaust leaks across...VX3003- SKU:
- VX3003
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
$50.98 -
VESRAH Exhaust Gasket VE-4004
VESRAH
$55.95Exhaust leaks compromise both performance and emissions control, robbing your engine of power while creating unwanted noise and heat. The VESRAH VE-4004 exhaust gasket pack delivers reliable sealing across multiple applications, preventing costly damage...VX4004- SKU:
- VX4004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$55.95 -
VESRAH Top End Gasket Kit - Yamaha 50 VG-6021
VESRAH
$13.74A top-end rebuild demands precision gaskets that seal properly under pressure—compromising here risks compression loss and oil leakage that'll sideline your bike. The VESRAH VG-6021 kit includes every gasket, o-ring, and valve guide oil seal you need for...09342896- SKU:
- 09342896
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
$13.74 -
VESRAH Complete Gasket Kit - XL/R 70/80 VG-1034
VESRAH
$59.95A complete engine rebuild demands precision at every seal and gasket interface—any leak or failure will compromise performance and reliability. The VESRAH VG-1034 Complete Gasket Kit delivers OEM-equivalent sealing across all critical engine passages,...VG1034- SKU:
- VG1034
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal: -
VESRAH Complete Gasket Kit - DT/MX/YZ125 VG-265
VESRAH
$26.25A complete engine rebuild demands precision sealing—and this VESRAH gasket kit delivers exactly what you need to restore your DT/MX/YZ125 to factory specifications. Worn or compromised gaskets are a common source of compression loss, oil weeping, and...VG265- SKU:
- VG265
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
$26.25 -
VESRAH Top End Gasket Kit - XL350 VG-5080-M
VESRAH
$138.95A top-end rebuild demands precision—gasket failure mid-race costs you time and credibility. The VESRAH VG-5080-M delivers complete gasket coverage for your XL350, eliminating guesswork and ensuring proper sealing across all critical engine surfaces. This...VG5080- SKU:
- VG5080
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- SET
$138.95 -
VESRAH Top End Gasket Kit - XL 200 VG-591
VESRAH
$31.95A top-end rebuild demands precision sealing at every interface—compromised gaskets lead to oil weeping, compression loss, and premature wear. The VESRAH VG-591 delivers a complete gasket solution with all necessary components in one kit, eliminating the...VG591- SKU:
- VG591
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$31.95 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-834-12
WSM
$357.62A complete top-end rebuild demands precision components that restore your engine to OEM specifications without compromise. The WSM Original Series kit delivers factory-quality pistons, rings, and bearings in one package—eliminating the guesswork of...01083412- SKU:
- 01083412
- Availability:
- Ships Same Business Day
- Weight:
- 4.00 LBS
- PISTON SIZE METRIC:
- +0.50 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 71.80 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$357.62 -
WSM Piston Kit - Kawasaki 900 - +.5 mm 010-840-05K
WSM
$80.40If you're building a high-displacement Kawasaki 900 engine or refreshing tired cylinders, this WSM piston kit delivers OEM-quality construction with measurable performance gains. The MOS2-coated skirts actively dissipate heat through the piston walls...01084005- SKU:
- 01084005
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MODEL:
- ORIGINAL
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 73.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
$80.40Qty in Cart: 0Quantity:Price:$80.40Subtotal: -
WSM Piston Rings 010-917
WSM
$43.40Piston rings are critical wear items that directly impact combustion efficiency, blow-by control, and engine longevity. WSM Piston Rings 010-917 deliver reliable sealing and heat transfer in high-demand applications, whether you're rebuilding a stock...010917- SKU:
- 010917
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BORE - OVERSIZE:
- STANDARD
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$43.40Qty in Cart: 0Quantity:Price:$43.40Subtotal: -
WSM Piston Rings 010-917-07
WSM
$43.40Piston rings are critical wear components that directly impact engine compression, oil control, and overall performance—they need to be replaced during any complete engine rebuild or overhaul. WSM Piston Rings deliver OEM-equivalent reliability with...01091707- SKU:
- 01091707
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- SET
$43.40Qty in Cart: 0Quantity:Price:$43.40Subtotal: -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1010
MOOSE RACING
$85.95A healthy crankshaft is the foundation of reliable engine performance, and worn bearings or seals will cost you power, efficiency, and ultimately, engine life. The MOOSE RACING Crankcase Bearing and Seal Kit 24-1010 delivers OEM-quality precision...A241010- SKU:
- A241010
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
$85.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1011
MOOSE RACING
$109.95A crankshaft bearing failure mid-race isn't just costly—it's catastrophic. The MOOSE RACING 24-1011 Crankcase Bearing and Seal Kit delivers OEM-quality precision bearings engineered to handle sustained high RPM loads while maintaining tight tolerances...A241011- SKU:
- A241011
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
$109.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1016
MOOSE RACING
$92.95A worn crankshaft bearing or damaged seal will compromise engine reliability and performance—leading to increased friction, oil leakage, and potential catastrophic failure. The MOOSE RACING Crankcase Bearing and Seal Kit 24-1016 delivers OEM-quality...A241016- SKU:
- A241016
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- BEARING KIT
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$92.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1021
MOOSE RACING
$103.95A worn or failing crankshaft bearing kit compromises engine reliability and performance—especially in high-RPM 2-stroke applications where precision matters. The MOOSE RACING 24-1021 delivers OEM-quality bearings with fluorocarbon seals engineered to...A241021- SKU:
- A241021
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
$103.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1024
MOOSE RACING
$75.95A worn or failing crankcase bearing directly compromises engine reliability and performance—especially critical in high-RPM 2-stroke applications where precision clearances are non-negotiable. The MOOSE RACING 24-1024 kit delivers OEM-quality bearings...A241024- SKU:
- A241024
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
$75.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1025
MOOSE RACING
$76.95A failing crankshaft bearing will quickly cascade into catastrophic engine failure—and there's no coming back from that. The MOOSE RACING 24-1025 kit delivers precision-engineered bearings with a fluorocarbon-sealed design that minimizes dry start...A241025- SKU:
- A241025
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$76.95 -
MOOSE RACING Gasket - Top End - Suzuki 810532
MOOSE RACING
$45.27A top-end rebuild demands precision gaskets that won't compromise seal integrity or cost you a fortune. The MOOSE RACING Gasket Set delivers OEM-quality sealing performance at a fraction of the price, using high-tech materials engineered for reliability...09346577- SKU:
- 09346577
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
$45.27 -
MOOSE RACING Valve and Spring Kit M40-41160
MOOSE RACING
$196.95If you're running OEM titanium valves, you're leaving performance and longevity on the table. The MOOSE RACING Valve and Spring Kit M40-41160 upgrades your cylinder head to Black Diamond stainless steel intake valves that deliver up to 4x longer service...09262445- SKU:
- 09262445
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95
