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
-
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 -
On Sale
Pro Circuit Water Pump Cover with Impeller for Kawasaki KX250 2019-2020 WPK17250
PRO CIRCUIT
MSRP: $239.95Now: $215.96Was: $239.95Engine cooling directly impacts your KX250's reliability and peak performance—especially under sustained high-RPM racing conditions. A stock water pump cover often allows cavitation and inefficient...09401611- SKU:
- 09401611
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COLOR/FINISH:
- MACHINED
- PRODUCT NAME:
- COVER
- UNITS:
- SET
- TYPE:
- WATER PUMP
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
MSRP: $239.95Now: $215.96Was: $239.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4022
MOOSE RACING
$23.95Countershaft seals are critical wear points that directly impact engine reliability and transmission performance. A failing seal allows contamination and fluid loss, compromising your engine's...09350447- SKU:
- 09350447
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$23.95 -
MOOSE RACING Inner Clutch Cover Gasket 816099
MOOSE RACING
$19.22A leaking clutch cover gasket compromises engine sealing and can lead to oil contamination and performance degradation. The MOOSE RACING Inner Clutch Cover Gasket (816099) delivers OEM-equivalent...09346121- SKU:
- 09346121
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$19.22 -
MOOSE RACING Inner Clutch Cover Gasket 816130
MOOSE RACING
$8.55A failing clutch cover gasket leads to oil leakage, contamination, and potential engine damage—exactly what you can't afford during competition or a critical rebuild. The MOOSE RACING Inner Clutch...09346122- SKU:
- 09346122
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$8.55 -
MOOSE RACING Inner Clutch Cover Gasket 816138
MOOSE RACING
$13.91Clutch cover gasket failures lead to oil seepage, loss of compression, and potential engine damage—especially critical if you're running a rebuilt or high-mileage engine. The MOOSE RACING Inner...09346123- SKU:
- 09346123
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$13.91 -
MOOSE RACING Inner Clutch Cover Gasket 816149
MOOSE RACING
$12.69A leaking clutch cover gasket compromises engine sealing and invites oil contamination into your clutch assembly—a costly problem if left unaddressed. The MOOSE RACING Inner Clutch Cover Gasket...09346124- SKU:
- 09346124
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$12.69 -
MOOSE RACING Motor Gasket Kit with Seal - Husqvarna/KTM 811374
MOOSE RACING
$145.13A complete engine and transmission rebuild demands precision-fit gaskets and seals—any compromise on fit or material quality risks oil leaks, compression loss, and premature wear. The MOOSE RACING...09345370- SKU:
- 09345370
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$145.13 -
MOOSE RACING Motor Gasket Kit with Seal - Kawasaki 811485
MOOSE RACING
$200.43A complete engine and transmission rebuild demands precision-fit gaskets and seals you can trust—and OEM replacements often carry premium pricing that doesn't reflect the part's actual value. The...09345371- SKU:
- 09345371
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$200.43
