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
PROX Cam Chain - T106ER - 110 Links - Gas Gas | Husqvarna | KTM 31.6356
PROX
MSRP: $88.95Now: $72.00Was: $88.95A worn or failing cam chain compromises valve timing precision and can lead to catastrophic engine damage if it breaks during operation. The PROX T106ER delivers OEM-equivalent reliability with...09251201- SKU:
- 09251201
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
BOLT Oil Change Hardware Kit - Honda OILCHG-CRF.2
BOLT
MSRP: $7.99Now: $7.19Was: $7.99Proper oil change intervals are non-negotiable for engine longevity, and using OEM-specification hardware ensures a reliable seal every time. This kit eliminates the hassle of sourcing individual...07120671- SKU:
- 07120671
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $7.99Now: $7.19Was: $7.99 -
Hot Cams Manual Cam Chain Tensioner for KTM 250 SX-F 2005-2023 HC00146
HOT CAMS
$46.95A worn or improperly tensioned cam chain will cause timing drift, increased noise, and accelerated wear on your top-end—all of which compromise both performance and engine longevity. The Hot Cams...09251602- SKU:
- 09251602
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$46.95 -
VERTEX Top End Piston Kit - 66.35 mm - Gas Gas | Husqvarna | KTM VTK23630B-3
VERTEX
$307.95When your top end starts showing signs of wear—whether it's lost compression, increased blow-by, or sluggish throttle response—a quality piston kit is essential to restore your bike's original...09106822- SKU:
- 09106822
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95 -
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...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...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...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...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...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...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...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...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 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...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...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...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...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...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...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...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...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
