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
-
On Sale
VESRAH Exhaust Gasket VE-4004
VESRAH
MSRP: $55.95Now: $53.15Was: $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...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
MSRP: $55.95Now: $53.15Was: $55.95 -
On Sale
VESRAH Top End Gasket Kit - Yamaha 50 VG-6021
VESRAH
MSRP: $13.74Now: $13.05Was: $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...09342896- SKU:
- 09342896
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
MSRP: $13.74Now: $13.05Was: $13.74 -
On Sale
VESRAH Complete Gasket Kit - XL/R 70/80 VG-1034
VESRAH
MSRP: $59.95Now: $56.95Was: $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...VG1034- SKU:
- VG1034
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
MSRP: $59.95Now: $56.95Was: $59.95Qty in Cart: 0Quantity:Price:MSRP: $59.95Now: $56.95Was: $59.95Subtotal: -
On Sale
VESRAH Complete Gasket Kit - DT/MX/YZ125 VG-265
VESRAH
MSRP: $26.25Now: $24.94Was: $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...VG265- SKU:
- VG265
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
MSRP: $26.25Now: $24.94Was: $26.25 -
On Sale
VESRAH Top End Gasket Kit - XL350 VG-5080-M
VESRAH
MSRP: $138.95Now: $132.00Was: $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...VG5080- SKU:
- VG5080
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $138.95Now: $132.00Was: $138.95 -
On Sale
VESRAH Top End Gasket Kit - XL 200 VG-591
VESRAH
MSRP: $31.95Now: $30.35Was: $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...VG591- SKU:
- VG591
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $31.95Now: $30.35Was: $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...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...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...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...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...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...A241011- SKU:
- A241011
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
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...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...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...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...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...09346577- SKU:
- 09346577
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
$45.27Qty in Cart: 0Quantity:Price:$45.27Subtotal: -
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...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 -
MOOSE RACING Intake Valve Kit M60-60460
MOOSE RACING
$196.95If you're running high-RPM applications or extended track sessions, OEM titanium intake valves won't cut it—they're the first component to show fatigue under sustained load. The MOOSE RACING Black...09262448- SKU:
- 09262448
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$196.95 -
MOOSE RACING Intake Valve Kit M60-60470
MOOSE RACING
$217.95If you're running high-mileage or high-boost applications, OEM titanium intake valves become a reliability liability. The MOOSE RACING Black Diamond stainless steel conversion kit extends valve train...09262449- SKU:
- 09262449
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95
