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
-
TMV Camchain Tensioner - Orange 138101012OR
TMV
$108.95Excessive timing chain slack is a silent killer—it allows destructive movement between your crankshaft and camshaft, risking catastrophic piston-to-valve contact and engine failure. The TMV Camchain Tensioner eliminates this dangerous play, maintaining...09251323- SKU:
- 09251323
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BASE COLOR:
- ORANGE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAM CHAIN TENSIONER
- UNITS:
- EACH
$108.95 -
MOOSE RACING Valve Shim - 7.48 x 2.95 - 5 pack MSE5PK748295
MOOSE RACING
$9.95Valve shim maintenance is critical to maintaining proper valve clearance and engine performance—spec drift in your valve train directly impacts combustion efficiency and longevity. This 5-pack of MOOSE Racing shims ensures you have precision sizing on...09261893- SKU:
- 09261893
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
$9.95 -
MOOSE RACING Valve Shim Kit - 8.90 mm MSEHCSHIM00
MOOSE RACING
$86.95Maintaining proper valve clearance is critical to engine reliability and performance—even a few thousandths of an inch off can cause misfires, valve float, or catastrophic damage. MOOSE Racing's 8.90 mm valve shim kit eliminates guesswork with...09261826- SKU:
- 09261826
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$86.95 -
MOOSE RACING Inner Clutch Cover Gasket 816174
MOOSE RACING
$13.80A leaking clutch cover gasket compromises engine oil retention and creates messy drips on your shop floor. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of the cost, using high-tech materials...09346125- SKU:
- 09346125
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$13.80 -
MOOSE RACING Inner Clutch Cover Gasket 816234
MOOSE RACING
$15.59A leaking clutch cover gasket compromises engine integrity and invites oil seepage that can damage surrounding components. The MOOSE RACING Inner Clutch Cover Gasket (816234) delivers OEM-equivalent sealing performance at a fraction of factory pricing,...09346128- SKU:
- 09346128
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$15.59 -
MOOSE RACING Inner Clutch Cover Gasket 816238
MOOSE RACING
$17.74A leaking clutch cover gasket compromises engine sealing integrity and can lead to oil contamination and transmission issues. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of OEM pricing, making it...09346129- SKU:
- 09346129
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$17.74 -
MOOSE RACING Inner Clutch Cover Gasket 816250
MOOSE RACING
$16.37A leaking clutch cover gasket compromises both engine performance and reliability—allowing oil seepage that can damage adjacent components and create messy maintenance headaches. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing...09346130- SKU:
- 09346130
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$16.37Qty in Cart: 0Quantity:Price:$16.37Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816255
MOOSE RACING
$13.91A leaking clutch cover gasket compromises engine reliability and can lead to costly oil seepage issues. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of OEM pricing, making it an essential...09346132- SKU:
- 09346132
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$13.91 -
MOOSE RACING Inner Clutch Cover Gasket 816256
MOOSE RACING
$16.73A leaking clutch cover doesn't just cost you oil—it costs you reliability and peace of mind on track or trail. The MOOSE RACING Inner Clutch Cover Gasket (816256) is a genuine OEM replacement engineered to seal tight and last, eliminating the guesswork...09346133- SKU:
- 09346133
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$16.73 -
MOOSE RACING Inner Clutch Cover Gasket 816263
MOOSE RACING
$16.90A leaking clutch cover gasket compromises both performance and engine longevity—oil seepage leads to contamination, slipped clutches, and costly secondary damage. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing without the...09346134- SKU:
- 09346134
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$16.90 -
MOOSE RACING Case Saver - KX250 0950-0113
MOOSE RACING
$27.95Engine case damage can sideline your KX250 mid-season, turning a minor crash into an expensive rebuild. The MOOSE RACING Case Saver replaces fragile OEM plastic guards with CNC-machined 6061 aluminum, providing genuine impact protection without adding...09500113- SKU:
- 09500113
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$27.95 -
MOOSE RACING Clutch Cover Gasket 817841
MOOSE RACING
$15.26A leaking clutch cover gasket compromises engine integrity and leads to costly oil seepage. The MOOSE RACING Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using high-tech materials engineered for durability...09341461- SKU:
- 09341461
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$15.26 -
MOOSE RACING Head Cover Gasket - CRF250 817844
MOOSE RACING
$19.21Head cover gaskets fail silently—a small leak turns into catastrophic oil loss and engine damage if left unchecked. OEM gaskets carry premium pricing that doesn't reflect the material or engineering involved, making Moose Racing's U.S.-manufactured...09341462- SKU:
- 09341462
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$19.21Qty in Cart: 0Quantity:Price:$19.21Subtotal: -
MOOSE RACING Head Cover Gasket - CRF450 817845
MOOSE RACING
$16.77A leaking head cover gasket compromises engine sealing and can lead to oil seepage that damages adjacent components. Moose Racing delivers OEM-equivalent gasket performance at a fraction of the cost, allowing you to rebuild with confidence without the...09341463- SKU:
- 09341463
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
$16.77Qty in Cart: 0Quantity:Price:$16.77Subtotal: -
MOOSE RACING Head Cover Gasket - KXF/RMZ 817846
MOOSE RACING
$24.96Engine valve cover gaskets wear out and fail—when they do, oil seeps into areas it shouldn't, compromising seal integrity and potentially damaging other components. The MOOSE RACING Head Cover Gasket delivers OEM-equivalent sealing performance at a...09341464- SKU:
- 09341464
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$24.96 -
MOOSE RACING Head Cover Gasket - RMZ450 817847
MOOSE RACING
$25.40Engine oil seepage around the valve cover is a clear sign your head gasket has lost its seal. OEM replacements carry a premium price tag, but Moose Racing delivers genuine-quality gasket performance at a fraction of the cost. This U.S.-manufactured...09341465- SKU:
- 09341465
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
- TYPE:
- HEAD COVER
$25.40 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1028
MOOSE RACING
$94.95A crankshaft bearing kit is essential maintenance for preserving engine longevity and reliable performance. Worn or damaged crank bearings introduce play into your crankshaft, leading to excessive vibration, power loss, and catastrophic engine failure...A241028- SKU:
- A241028
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
- UNITS:
- KIT
$94.95 -
MOOSE RACING Ignition Cover Gasket 816702
MOOSE RACING
$11.24A leaking ignition cover gasket can compromise engine sealing and lead to costly oil seepage. MOOSE RACING's OEM-specification replacement gasket delivers the precision fit and durability you need to restore proper engine integrity without the premium...09341901- SKU:
- 09341901
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$11.24 -
MOOSE RACING Top End Gasket Kit - 50 SX 810337
MOOSE RACING
$30.94A top-end rebuild demands precision components that won't compromise reliability or break your budget. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction of manufacturer pricing, giving you the confidence to rebuild...09341904- SKU:
- 09341904
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$30.94 -
MOOSE RACING Top End Gasket Kit - 65 XC/SX 810338
MOOSE RACING
$33.72A top-end rebuild demands precision—and cutting corners on gaskets and seals is how engines fail. The MOOSE RACING Top End Gasket Kit delivers OEM-quality sealing at a fraction of factory pricing, with every component engineered to handle repeated heat...09341906- SKU:
- 09341906
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$33.72
