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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MOOSE RACING Complete Motor Gasket Kit - KX85 808414
MOOSE RACING
$58.40A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load—and OEM replacements come with OEM pricing. The MOOSE RACING Complete Motor Gasket Kit...M808414- SKU:
- M808414
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$58.40 -
MOOSE RACING Complete Motor Gasket Kit - KX125 808430
MOOSE RACING
$87.56A complete engine rebuild demands gasket and seal integrity—any leak or failure compromises compression, efficiency, and reliability. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality...09340141- SKU:
- 09340141
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$87.56 -
MOOSE RACING Complete Motor Gasket Kit - KLX/DRZ 808585
MOOSE RACING
$100.41A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality replacement seals...09340143- SKU:
- 09340143
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$100.41 -
MOOSE RACING Complete Motor Gasket Kit - KX125 808427
MOOSE RACING
$81.81A complete engine and transmission rebuild demands gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing individual...M808427- SKU:
- M808427
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$81.81 -
MOOSE RACING Ignition Cover Gasket 816100
MOOSE RACING
$7.81A failing ignition cover gasket compromises engine sealing and can lead to oil leakage, reduced performance, and potential engine damage. The MOOSE RACING Ignition Cover Gasket delivers OEM-quality...09340567- SKU:
- 09340567
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$7.81 -
MOOSE RACING Clutch Cover Gasket 816057
MOOSE RACING
$12.69A leaking clutch cover gasket compromises engine sealing and can lead to oil weeping that accelerates wear on internal components. The MOOSE RACING Clutch Cover Gasket 816057 delivers OEM-equivalent...09340568- SKU:
- 09340568
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$12.69 -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811264
MOOSE RACING
$126.65A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. MOOSE Racing delivers OEM-quality components at a fraction of dealership...09340459- SKU:
- 09340459
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$126.65 -
MOOSE RACING Complete Motor Gasket Kit - CRF250R/X 808262
MOOSE RACING
$169.24A complete engine rebuild demands precision gaskets and seals that won't compromise your work—OEM replacements often come at premium prices, but Moose Racing delivers the same reliability at a...09340460- SKU:
- 09340460
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$169.24 -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811465
MOOSE RACING
$123.84A complete engine and transmission rebuild demands precision-fit gaskets and seals—any compromise risks leaks, performance loss, and catastrophic damage. The MOOSE RACING Motor Gasket Kit eliminates...09340464- SKU:
- 09340464
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$123.84 -
MOOSE RACING Top End Gasket Kit - 50 Adventure 810314
MOOSE RACING
$27.72A top-end rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Top End Gasket Kit delivers OEM-quality replacement seals at a fraction of OEM pricing, giving you...09340465- SKU:
- 09340465
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$27.72 -
MOOSE RACING Top End Gasket Kit - 200/SX/EXC 810319
MOOSE RACING
$32.09A top-end rebuild demands gasket and seal components that match OEM quality without the OEM price tag. The MOOSE RACING Top End Gasket Kit delivers genuine replacement seals paired with high-tech...09340468- SKU:
- 09340468
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$32.09 -
MOOSE RACING Complete Motor Gasket Kit - KTM 200/250 808319
MOOSE RACING
$74.51A complete engine and transmission rebuild demands gasket integrity that matches OEM specifications without the OEM price tag. This Moose Racing kit delivers genuine oil seals and...09340469- SKU:
- 09340469
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$74.51 -
MOOSE RACING Motor Gasket Kit with Seal - 200SX/EXC 811319
MOOSE RACING
$98.45A complete engine and transmission rebuild demands precision gaskets and seals that fit right the first time—OEM quality without the premium price tag. This Moose Racing kit gives you everything...09340470- SKU:
- 09340470
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$98.45 -
MOOSE RACING Top End Gasket Kit - RM250 810593
MOOSE RACING
$47.28A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction...09340973- SKU:
- 09340973
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
$47.28 -
POWERSTANDS RACING Cam Chain Tensioner - MX GM 08-02000-28
POWERSTANDS RACING
$74.95A worn or failing cam chain tensioner introduces timing inconsistencies that compromise engine efficiency and accelerate internal wear. This POWERSTANDS Racing billet aluminum tensioner eliminates...09251260- SKU:
- 09251260
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAM CHAIN TENSIONER
- UNITS:
- EACH
$74.95 -
POWERSTANDS RACING Drain Plug 00-01946-22
POWERSTANDS RACING
$25.95A quality drain plug isn't just a fastener—it's insurance against catastrophic oil loss during high-RPM sessions. The POWERSTANDS RACING Drain Plug combines precision engineering with practical...09200107- SKU:
- 09200107
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- FEATURES:
- MAGNETIC
- TYPE:
- OIL DRAIN
- COLOR/FINISH:
- BLACK
- DIAMETER - THREAD SIZE METRIC:
- M12 X 1.50 X 15 MM
- RIDING STYLE:
- UTV
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- BOLT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Pro Circuit Engine Plug Kit for Kawasaki KX250F 2011-2024 PC4009-0001
PRO CIRCUIT
$69.95If you're running a KX250F, the stock engine plugs are functionally adequate but visually unremarkable. The Pro Circuit Engine Plug Kit elevates both the look and longevity of your engine bay with...09400659- SKU:
- 09400659
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- MIRROR
- PRODUCT NAME:
- PLUG KIT
- UNITS:
- KIT
- COLOR/FINISH:
- RED
- MATERIAL:
- ALUMINUM
- TYPE:
- ENGINE
$69.95 -
Pro Circuit Engine Plug Kit Yamaha YZ450F 2010-2020 PC40009-0019
PRO CIRCUIT
$69.95Engine covers and filler caps are exposed to constant heat, vibration, and mud—stock plastic plugs crack and degrade quickly. The Pro Circuit Engine Plug Kit replaces these wear items with...09401993- SKU:
- 09401993
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- MIRROR
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLUE
- PRODUCT NAME:
- PLUG KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- ANODIZED
$69.95 -
Pro Circuit Ignition Cover for Kawasaki KLX110 2010-2025 ICK20110
PRO CIRCUIT
$63.00The ignition cover is one of the most exposed components on your KLX110, taking direct hits from roost, mud, and debris during aggressive riding. This Pro Circuit ignition cover shields your bike's...09401985- SKU:
- 09401985
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
$63.00 -
Pro Circuit Replacement O-Ring for 2004 Kawasaki KX250F and RM-Z250 PC4008-0401
PRO CIRCUIT
$5.95A failing water pump seal compromises cooling system integrity and risks catastrophic engine damage on the track or trail. The PRO CIRCUIT PC4008-0401 replacement O-ring restores OEM-spec sealing...09350003- SKU:
- 09350003
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- WATER PUMP
- PRODUCT NAME:
- O-RING
- UNITS:
- EACH
$5.95
