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!
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- Qty in Cart
- Quantity
- Price
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On Sale
Wossner Piston Kit 94.95 mm Husqvarna FC450 2023-2024 4097DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00When your FC450 demands peak performance, a worn or stock piston becomes your limiting factor. The Wossner 94.95 mm Piston Kit delivers the precision engineering and durability required to sustain high RPMs and aggressive riding conditions while reducing...09106845- SKU:
- 09106845
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $214.00Now: $203.30Was: $214.00 -
VERTEX Top End Gasket Kit - Gas Gas/Husqvarna/KTM 810991
VERTEX
$101.25A leaking or deteriorating top-end gasket can silently drain your engine's performance and lead to costly damage if left unchecked. This VERTEX gasket kit delivers OEM-quality sealing across all critical top-end surfaces, keeping compression where it...09348014- SKU:
- 09348014
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$101.25 -
MOOSE RACING SEAL KIT COUNTERSHAFT BET 25-4047
MOOSE RACING
$25.95Countershaft seal failure leads to oil leakage, contamination, and accelerated wear on critical drivetrain components. The MOOSE RACING SEAL KIT COUNTERSHAFT BET 25-4047 delivers OEM-quality sealing with engineered precision to keep your transmission...09351195- SKU:
- 09351195
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
$25.95 -
WINDEROSA Top End Gasket Kit - Kawasaki 550 610103
WINDEROSA
$51.03A top-end gasket kit is essential maintenance for any Kawasaki 550/610 engine—worn gaskets lead to compression loss, oil seepage, and decreased performance. WINDEROSA's comprehensive kit addresses all critical sealing points, ensuring your engine...PD812325- SKU:
- PD812325
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$51.03 -
WINDEROSA Top End Gasket Kit - Raider 701 610602
WINDEROSA
$67.95A failed top-end gasket can compromise your engine's compression and introduce coolant or oil contamination into the combustion chamber—both catastrophic for performance and engine longevity. The WINDEROSA Top End Gasket Kit delivers OEM-quality sealing...PD812532- SKU:
- PD812532
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$67.95 -
WINDEROSA Gasket Kit - Standard Bore 810373
WINDEROSA
$71.97A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures reliable sealing across all critical surfaces and prevents costly coolant and oil leaks that compromise performance and engine longevity. The WINDEROSA Gasket Kit...09346009- SKU:
- 09346009
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$71.97 -
WORKS CONNECTION Engine Timing Plug - Red - Honda 24-508
WORKS CONNECTION
$46.95Stock engine timing plugs are often overlooked, but replacing them with precision-machined alternatives eliminates wobbling, improves reliability, and gives your engine bay a finished, professional appearance. The WORKS CONNECTION timing plugs are...09500092- SKU:
- 09500092
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- RED
- TYPE:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
$46.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1008
MOOSE RACING
$83.95A crankshaft bearing failure doesn't just sideline your engine—it can cause catastrophic internal damage that ends a season or a rebuild investment. The MOOSE RACING 24-1008 kit delivers OEM-quality precision bearings with engineered seals that protect...A241008- SKU:
- A241008
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
$83.95 -
MOOSE RACING Motor Gasket Kit with Seal - 125SX 811330
MOOSE RACING
$121.59A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work—OEM-quality components at a fraction of dealership pricing. This Moose Racing kit eliminates the hassle of sourcing individual gasket sets...09341268- SKU:
- 09341268
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$121.59 -
MOOSE RACING Inner Clutch Cover Gasket 816213
MOOSE RACING
$13.18A leaking clutch cover gasket compromises engine sealing and invites oil loss—replacing it is essential maintenance for any rebuild or repair. This Moose Racing gasket delivers OEM-equivalent fitment and reliability at a fraction of OEM pricing, so you...09346127- SKU:
- 09346127
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$13.18 -
MOOSE RACING Clutch Cover Gasket 817826
MOOSE RACING
$8.88A leaking clutch cover gasket compromises engine reliability and creates messy maintenance headaches. The Moose Racing 817826 replacement gasket seals with precision while withstanding thermal cycling and pressure demands, letting you rebuild with...09341460- SKU:
- 09341460
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$8.88 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1027
MOOSE RACING
$89.95A worn crankshaft bearing or degraded seal can introduce metal-to-metal contact, excessive drag, and catastrophic engine failure—especially critical in high-RPM 2-stroke applications. The MOOSE RACING 24-1027 kit delivers precision-matched bearings with...A241027- SKU:
- A241027
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$89.95 -
MOOSE RACING Valve Shim - 9.48 x 2.75 - 5 pack MSE5PK948275
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity and performance—improper shimming leads to valve clearance issues, lost compression, and catastrophic engine damage. The MOOSE RACING 9.48 x 2.75 Valve Shim 5-pack eliminates guesswork with...09261959- SKU:
- 09261959
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.75 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.80 - 5 pack MSE5PK948280
MOOSE RACING
$9.95Precision valve train maintenance demands reliable, clearly-identified shims that won't let you down mid-rebuild. These MOOSE RACING shims eliminate guesswork with laser-etched sizing and forged 4140 steel construction that maintains dimensional...09261960- SKU:
- 09261960
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.80 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Complete Motor Gasket Kit - XR650L 808281
MOOSE RACING
$121.92A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. The Moose Racing Complete Motor Gasket Kit eliminates the frustration of sourcing individual components by bundling everything you need in one...M808281- SKU:
- M808281
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$121.92 -
MOOSE RACING Clutch Guard - Cylinder - Beta 13-4020
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain strikes and debris impact—damage that can sideline your bike mid-season. The MOOSE RACING Clutch Guard provides direct protection where it matters most, combining durable aluminum construction with...09500921- SKU:
- 09500921
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- COLOR/FINISH:
- ANODIZED
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
$42.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4024
MOOSE RACING
$22.95A worn countershaft sprocket seal allows oil leakage and accelerates wear on critical drivetrain components—a small oversight that compounds into expensive damage. This MOOSE RACING kit delivers OEM-quality sealing with upgraded materials, ensuring your...09350449- SKU:
- 09350449
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
$22.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4025
MOOSE RACING
$22.95Countershaft seals are critical to engine longevity—they prevent oil contamination and gear wear that can compromise your transmission. The MOOSE RACING 25-4025 kit replaces worn or damaged seals with OEM-quality components, restoring proper lubrication...09350450- SKU:
- 09350450
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$22.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4027
MOOSE RACING
$23.95A worn countershaft sprocket seal compromises engine performance and invites contamination into critical drivetrain components. This MOOSE RACING kit delivers OEM-quality sealing with precision-engineered components that restore reliability and extend...09350452- SKU:
- 09350452
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$23.95 -
On Sale
VESRAH Complete Gasket Kit - XL 250 VG-142
VESRAH
MSRP: $58.95Now: $56.00Was: $58.95A complete gasket kit is non-negotiable for any engine rebuild—mismatched or worn seals will compromise compression, leak oil, and undermine all your other restoration work. The VESRAH VG-142 delivers every gasket and seal you need in one comprehensive...VG142- SKU:
- VG142
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $58.95Now: $56.00Was: $58.95
