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 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 - 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 -
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 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 -
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 Diamond stainless steel conversion kit replaces them with...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 life by up to 4x while improving flow...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 -
MOOSE RACING Valve and Spring Kit M60-61160
MOOSE RACING
$196.95If you're running high-performance applications that demand reliability over thousands of miles, OEM titanium intake valves hit a durability ceiling. The MOOSE RACING Valve and Spring Kit M60-61160 replaces that ceiling with stainless steel Black Diamond...09262454- SKU:
- 09262454
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
$196.95 -
MOOSE RACING Valve and Spring Kit M60-61260
MOOSE RACING
$196.95If you're running your engine hard, valve train durability becomes critical—and OEM titanium intake valves simply can't keep pace with sustained high-performance demands. The MOOSE RACING Valve and Spring Kit M60-61260 replaces them with stainless steel...09262455- SKU:
- 09262455
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
$196.95 -
MOOSE RACING Valve Kit M30-32270
MOOSE RACING
$274.95If you're pushing your engine to the limit, your valvetrain needs to match that commitment. Stock valves are engineered for longevity, not peak performance—they flex under high RPM loads and limit your engine's breathing potential. The MOOSE RACING Valve...09262576- SKU:
- 09262576
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- MODEL:
- PRO
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$274.95 -
MOOSE RACING Crank Bearing - YZ 65/85 24-1117
MOOSE RACING
$53.95A worn or failing crankshaft bearing will quickly rob your YZ 65/85 of reliability and throttle response—two things you can't afford to lose on the track or trail. MOOSE Racing's precision bearings restore the tight tolerances your engine demands, while...09240604- SKU:
- 09240604
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- PRODUCT NAME:
- BEARING
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BALL
$53.95 -
MOOSE RACING Crank Bearing - KXF/RMZ 24-1081
MOOSE RACING
$56.95The crankshaft is the heart of your 2-stroke engine, and worn or failing bearings will kill performance and reliability faster than anything else. MOOSE Racing crank bearings are precision-engineered to restore tight tolerances and smooth rotation,...09240103- SKU:
- 09240103
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
$56.95 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808330
MOOSE RACING
$88.86A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load—OEM parts carry premium pricing that Moose Racing eliminates without compromising quality. This comprehensive kit includes every gasket, o-ring, and...09341684- SKU:
- 09341684
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$88.86
