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 Gasket VE-2004
VESRAH
$42.78A compromised exhaust gasket is an often-overlooked source of performance loss and unwanted noise. The VESRAH VE-2004 delivers a reliable, OEM-quality seal that prevents exhaust leaks, maintains proper scavenging efficiency, and eliminates the metallic...VX2004- SKU:
- VX2004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 10 PACK
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
$42.78 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4028
MOOSE RACING
$23.95A worn countershaft sprocket seal is a silent performance killer—it allows critical oil to leak into your transmission cavity, compromising lubrication and accelerating wear on your drivetrain. The MOOSE RACING Countershaft Sprocket Seal Kit delivers a...09350453- SKU:
- 09350453
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$23.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4029
MOOSE RACING
$24.95Countershaft seals are critical wear items that prevent transmission fluid from leaking into the engine case—a failure that can contaminate your oil and compromise engine performance. The MOOSE RACING 25-4029 kit replaces all essential sealing components...09350454- SKU:
- 09350454
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823077
MOOSE RACING
$8.13A quality exhaust gasket kit is essential for maintaining a sealed exhaust system and preventing performance-robbing leaks that compromise efficiency and increase emissions. MOOSE RACING's 823077 gasket kit delivers OEM-grade reliability with...09345292- SKU:
- 09345292
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$8.13 -
MOOSE RACING Exhaust Gasket Kit 823094
MOOSE RACING
$8.13A quality exhaust gasket kit is essential for maintaining a sealed exhaust system and preventing power-robbing leaks that compromise performance and create annoying rattles. The MOOSE RACING 823094 provides OEM-grade sealing across critical exhaust...09345295- SKU:
- 09345295
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- EXHAUST
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$8.13 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808370
MOOSE RACING
$123.32A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing individual components while delivering...09345354- SKU:
- 09345354
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$123.32Qty in Cart: 0Quantity:Price:$123.32Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808373
MOOSE RACING
$127.66A complete engine rebuild demands precision gaskets and seals that won't compromise reliability or performance. This Moose Racing kit eliminates the hassle of sourcing individual components by bundling everything you need for a full engine and...09345356- SKU:
- 09345356
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$127.66Qty in Cart: 0Quantity:Price:$127.66Subtotal: -
MOOSE RACING Top End Gasket Kit - Huqvarna/KTM 810370
MOOSE RACING
$70.25A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to reassemble...09345360- SKU:
- 09345360
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.25 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810372
MOOSE RACING
$81.70A top-end rebuild demands precision and reliability—MOOSE RACING gasket kits deliver both at a fraction of OEM pricing. Each set is engineered with high-tech materials to withstand engine stress while maintaining exact fitment, ensuring your rebuild...09345361- SKU:
- 09345361
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$81.70 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810373
MOOSE RACING
$70.36A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the price, letting you restore compression and...09345362- SKU:
- 09345362
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.36 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810374
MOOSE RACING
$73.09A top-end rebuild demands precision gaskets and seals that won't fail under race conditions or heavy use. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability at a fraction of the cost, letting you rebuild your Husqvarna or KTM engine...09345363- SKU:
- 09345363
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$73.09 -
MOOSE RACING Top End Gasket Kit - Kawasaki 810485
MOOSE RACING
$81.81A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, letting you rebuild with confidence whether you're...09345364- SKU:
- 09345364
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$81.81 -
MOOSE RACING Top End Gasket Kit - KTM 810976
MOOSE RACING
$71.76Whether you're rebuilding after a piston replacement or performing routine top-end maintenance, a quality gasket kit is non-negotiable for engine reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent sealing with domestic manufacturing...09345365- SKU:
- 09345365
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$71.76 -
MOOSE RACING Intake Valve Kit M40-40380
MOOSE RACING
$196.95OEM intake valves wear out and compromise flow efficiency—costing you power and reliability when it matters most. The MOOSE RACING Stainless Steel Intake Valve Kit M40-40380 replaces tired factory components with Black Diamond stainless steel valves...09262441- SKU:
- 09262441
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95 -
MOOSE RACING Valve and Spring Kit M40-41060
MOOSE RACING
$196.95If you're running your engine hard, OEM titanium valves won't cut it—they wear fast and leave performance on the table. The MOOSE RACING Valve and Spring Kit M40-41060 swaps them out for Black Diamond stainless steel valves that last up to 4x longer...09262444- SKU:
- 09262444
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- APPLICATION:
- INTAKE
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$196.95 -
MOOSE RACING Circlip MSE72048K
MOOSE RACING
$3.95A quality circlip is a critical fastener that prevents component separation under high loads and vibration—exactly what your engine or transmission experiences during aggressive driving. The MOOSE Racing MSE72048K delivers the precision retention you...09130185- SKU:
- 09130185
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- SET
- PRODUCT NAME:
- CIRCLIP
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
MOOSE RACING Circlip MSE72050K
MOOSE RACING
$3.95Precision circlips are critical fastening components in high-performance engines and transmissions, where failure can mean catastrophic internal damage. The MOOSE Racing MSE72050K delivers the reliability and dimensional accuracy your build demands,...09130186- SKU:
- 09130186
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- SET
- APPLICATION:
- PISTON
- PRODUCT NAME:
- CIRCLIP
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
MOOSE RACING Piston Kit - 71.94 mm MSE24244B
MOOSE RACING
$235.95If you're rebuilding an engine or replacing worn pistons, you need components engineered to withstand extreme combustion pressures while minimizing thermal distortion and wear. The MOOSE RACING Piston Kit MSE24244B delivers exactly that—a gravity-cast...09105953- SKU:
- 09105953
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$235.95 -
MOOSE RACING Piston Kit - 48.45 mm MSE23637B
MOOSE RACING
$158.95When your engine's piston assembly shows signs of wear or you're rebuilding for increased durability, a quality replacement kit is essential to maintain compression, reduce blow-by, and ensure consistent performance across the power band. The MOOSE...09105954- SKU:
- 09105954
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$158.95 -
MOOSE RACING Piston Kit - 57.95 mm MSE24101B
MOOSE RACING
$206.95A piston kit that delivers measurable reliability gains where it counts most—inside your engine. The gravity-cast aluminum construction with 18% silicon content resists thermal distortion and wear, giving you extended service life without sacrificing...09105956- SKU:
- 09105956
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 57.95 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$206.95
