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 Ignition Cover Gasket 816705
MOOSE RACING
$10.63A leaking ignition cover gasket compromises engine sealing and can lead to oil seepage that damages adjacent components. This MOOSE RACING replacement gasket delivers OEM-quality sealing at a fraction of dealership pricing, making it an economical choice...09342213- SKU:
- 09342213
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63 -
MOOSE RACING Complete Gasket Kit 808337
MOOSE RACING
$63.10A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. The MOOSE RACING Complete Gasket Kit delivers OEM-quality components at a fraction of dealership pricing, giving you the confidence to...09341954- SKU:
- 09341954
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$63.10 -
MOOSE RACING Top End Gasket Kit - KTM105 SX/XC 810332
MOOSE RACING
$44.42A top-end rebuild demands precision seals and gaskets that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit gives you OEM-quality components at a fraction of factory pricing, so you can confidently refresh your KTM...09341955- SKU:
- 09341955
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$44.42 -
MOOSE RACING Valve Seal Kit M96-96470
MOOSE RACING
$15.95Valve seal degradation is one of the most common causes of oil consumption and compression loss in high-mileage engines. The MOOSE RACING Valve Seal Kit M96-96470 replaces worn OEM seals with precision-engineered components that deliver superior sealing...09262840- SKU:
- 09262840
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
MOOSE RACING Intake Valve Kit M30-31210
MOOSE RACING
$196.95OEM titanium intake valves face accelerated wear under high-stress racing conditions, limiting your engine's reliability and rebuild intervals. The MOOSE RACING Intake Valve Kit M30-31210 replaces those components with stainless steel Black Diamond...09262428- SKU:
- 09262428
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$196.95 -
MOOSE RACING Valve Shim - 9.48 x 3.50 - 5 pack MSE5PK948350
MOOSE RACING
$9.95Precision valve shimming is critical for maintaining tight valve clearances and preventing costly engine damage. This 5-pack of MOOSE RACING valve shims eliminates the guesswork during valve train maintenance—each shim is laser-etched with its size for...09261974- SKU:
- 09261974
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.50 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Seal Kit M30-31410
MOOSE RACING
$15.95Valve seal degradation causes oil consumption, compression loss, and increased emissions—issues that compound quickly under racing or high-performance driving conditions. The MOOSE RACING Valve Seal Kit M30-31410 replaces worn OEM seals with...09262817- SKU:
- 09262817
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- BASE COLOR:
- RED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
MOOSE RACING Valve Seal Kit M30-31570
MOOSE RACING
$15.95Valve seals are a critical wear item that directly impacts combustion chamber integrity and oil consumption. Factory seals often degrade under sustained high RPM operation, leading to blow-by and reduced engine efficiency. The MOOSE RACING Valve Seal Kit...09262820- SKU:
- 09262820
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
$15.95 -
MOOSE RACING Clutch Cylinder Guard - 400-525 13-092
MOOSE RACING
$27.95Hydraulic clutch cylinders are vulnerable to chain slap and impact damage on aggressive riding—unplanned downtime derails race day. The MOOSE RACING Clutch Cylinder Guard protects this critical component with CNC-machined aluminum construction, while...09500150- SKU:
- 09500150
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- SLAVE CYLINDER
$27.95 -
MOOSE RACING Case Saver - CRF250R 01-163
MOOSE RACING
$23.95Engine case damage from crashes or debris can sideline your CRF250R and drain your wallet fast. This MOOSE RACING case saver replaces the vulnerable OEM plastic guards with CNC-machined 6061 aluminum that actually withstands impact, keeping your engine...09500015- SKU:
- 09500015
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- TYPE:
- ENGINE
$23.95 -
MOOSE RACING Case Saver - CRF450R 01-164
MOOSE RACING
$23.95Engine case damage can sideline your CRF450R mid-season and drain your wallet fast. The MOOSE RACING Case Saver replaces flimsy OEM plastic guards with precision-engineered aluminum protection that actually withstands crashes, rocks, and aggressive trail...09500017- SKU:
- 09500017
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$23.95 -
MOOSE RACING Case Saver - YZ250F 04-163
MOOSE RACING
$23.95Engine case damage can sideline your YZ250F and drain your wallet fast. The MOOSE RACING Case Saver replaces fragile OEM plastic guards with CNC-machined aluminum protection that actually looks purposeful on your bike. Whether you're racing or riding...09500019- SKU:
- 09500019
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
$23.95 -
MOOSE RACING Case Saver - YZ450F 04-164
MOOSE RACING
$23.95Engine case damage on your YZ450F can mean expensive repairs and lost race time. This MOOSE RACING Case Saver replaces flimsy OEM plastic with rigid 6061 aluminum, delivering real protection where it matters most. Built and proven by riders who demand...09500021- SKU:
- 09500021
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
$23.95 -
MOOSE RACING Case Saver Guard - RMZ450 CSG16
MOOSE RACING
$37.95Engine case damage during a crash or tip-over can mean thousands in rebuild costs and lost race time. The MOOSE RACING Case Saver Guard protects your RMZ450's vulnerable crankcase with a slim, lightweight design that doesn't compromise your bike's...09500379- SKU:
- 09500379
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- RED
- TYPE:
- CASE SAVER
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- MATERIAL:
- NYLON
- RIDING STYLE:
- OFF-ROAD
$37.95 -
MOOSE RACING Clutch Guard - Cylinder - Sherco 13-9019
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain strikes and debris during aggressive riding—damage here means catastrophic clutch failure mid-race. The MOOSE RACING Clutch Guard shields your cylinder with purpose-built protection while integrated...09500919- SKU:
- 09500919
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- SLAVE CYLINDER
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
$42.95 -
MOOSE RACING Clutch Cover Gasket 817253
MOOSE RACING
$7.49A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly what you don't need mid-race or during a rebuild. The MOOSE RACING 817253 clutch cover gasket delivers OEM-equivalent sealing performance at a...M817253- SKU:
- M817253
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$7.49 -
MOOSE RACING Complete Motor Gasket Kit - KTM 50SX 808312
MOOSE RACING
$32.09A complete engine and transmission rebuild demands precision gaskets and seals that won't fail mid-season. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to push your KTM...09340140- SKU:
- 09340140
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$32.09 -
MOOSE RACING Complete Motor Gasket Kit - DR350 808584
MOOSE RACING
$93.43A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't fail mid-season. This MOOSE RACING kit eliminates the guesswork of sourcing individual components, giving you every gasket, o-ring, and seal needed for a...09340142- SKU:
- 09340142
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$93.43 -
MOOSE RACING Complete Motor Gasket Kit - KX125 808425
MOOSE RACING
$80.32A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load—the MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of the cost. This comprehensive set eliminates multiple...M808425- SKU:
- M808425
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
$80.32 -
MOOSE RACING Complete Motor Gasket Kit - KX125 808429
MOOSE RACING
$87.56A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your motor's integrity. This Moose Racing kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to rebuild without...M808429- SKU:
- M808429
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$87.56
