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 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...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...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...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...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...09346130- SKU:
- 09346130
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$16.37 -
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...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...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...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...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...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...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
$19.21 -
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,...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
$16.77 -
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...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
$24.96Qty in Cart: 0Quantity:Price:$24.96Subtotal: -
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...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...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...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...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,...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 -
MOOSE RACING Water Pump Rebuild Kit 821212
MOOSE RACING
$56.29A failing water pump can compromise your entire cooling system, leading to catastrophic engine damage if left unaddressed. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap...09345178- SKU:
- 09345178
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$56.29 -
MOOSE RACING Valve Seal Kit M96-96320
MOOSE RACING
$15.95Valve seals are critical to maintaining compression and preventing oil burn-off in high-performance engines. Over time, OEM seals degrade from heat cycling and combustion pressures, leading to...09262836- SKU:
- 09262836
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
$15.95
