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 Inner Clutch Cover Gasket 816301
MOOSE RACING
$20.35A leaking clutch cover gasket compromises both engine integrity and performance—allowing oil seepage that can contaminate your clutch assembly and degrade friction characteristics. The MOOSE RACING Inner Clutch Cover Gasket 816301 is engineered as a...09346149- SKU:
- 09346149
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$20.35 -
MOOSE RACING Inner Clutch Cover Gasket 816306
MOOSE RACING
$13.64A leaking inner clutch cover doesn't just cost you oil—it compromises engine sealing integrity and can lead to contamination of critical drivetrain components. The MOOSE RACING Inner Clutch Cover Gasket 816306 delivers OEM-equivalent sealing performance...09346150- SKU:
- 09346150
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$13.64 -
MOOSE RACING Inner Clutch Cover Gasket 816315
MOOSE RACING
$28.13A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly what you want to avoid during critical race sessions or long rebuild work. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent...09346151- SKU:
- 09346151
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$28.13 -
MOOSE RACING Water Pump Rebuild Kit 821327
MOOSE RACING
$61.88A failing water pump leads to catastrophic engine overheating and potential catastrophic damage—downtime you can't afford. The MOOSE RACING Water Pump Rebuild Kit 821327 gives you OEM-quality replacement components to restore full cooling system...09345198- SKU:
- 09345198
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$61.88 -
MOOSE RACING Water Pump Rebuild Kit 821676
MOOSE RACING
$53.84A failing water pump is a silent killer that can leave you stranded or cause catastrophic engine damage. This MOOSE RACING rebuild kit supplies every seal, bearing, and gasket you need to restore your water pump to OEM specifications without replacing...09345262- SKU:
- 09345262
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$53.84 -
MOOSE RACING Water Pump Rebuild Kit 821679
MOOSE RACING
$55.70A failing water pump can leave you stranded or cause catastrophic engine damage—and replacement isn't always practical or cost-effective. The MOOSE RACING Water Pump Rebuild Kit gives you everything needed to restore your pump to factory specifications...09345264- SKU:
- 09345264
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$55.70 -
MOOSE RACING Exhaust Gasket Kit 823042
MOOSE RACING
$9.68A quality exhaust gasket kit is essential for maintaining a sealed exhaust system and preventing performance-robbing air leaks that compromise horsepower and fuel efficiency. MOOSE RACING's gasket kit provides OEM-equivalent sealing across critical...09345274- SKU:
- 09345274
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$9.68 -
MOOSE RACING Motor Gasket Kit with Seal - Husqvarna/KTM 811370
MOOSE RACING
$135.40A complete engine and transmission rebuild demands precision-fit gaskets and seals—and sourcing OEM-quality components separately becomes costly and time-consuming. This Moose Racing Motor Gasket Kit consolidates everything you need into one...09345366- SKU:
- 09345366
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$135.40 -
MOOSE RACING Exhaust Gasket Kit 823196
MOOSE RACING
$16.37A compromised exhaust seal can silently rob your engine of performance through gas leakage and heat loss—costing you horsepower you've paid for. The MOOSE RACING Exhaust Gasket Kit 823196 delivers OEM-quality sealing across your entire exhaust manifold...09346687- SKU:
- 09346687
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$16.37 -
MOOSE RACING Valve Shim - 7.48 x 1.35 - 5 pack MSE5PK748135
MOOSE RACING
$9.95Proper valve clearance is critical to engine performance and longevity, and having the right shims on hand eliminates guesswork during valve train maintenance. MOOSE RACING valve shims are forged from premium 4140 cold rolled steel—not sintered—ensuring...09261861- SKU:
- 09261861
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.35 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Ignition Cover Gasket 816193
MOOSE RACING
$11.93A leaking ignition cover gasket compromises engine sealing and can lead to oil loss and contamination. MOOSE RACING's OEM-equivalent replacement gasket delivers reliable sealing at a fraction of dealer pricing, whether you're doing routine maintenance or...09340971- SKU:
- 09340971
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
$11.93 -
MOOSE RACING Top End Gasket Kit - KX450 810469
MOOSE RACING
$78.88When you're rebuilding a KX450 top end, every gasket and seal matters—a single leak or improper fit can undermine your entire engine build. The MOOSE RACING Top End Gasket Kit eliminates guesswork by providing every component you need for a complete,...09341001- SKU:
- 09341001
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$78.88 -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811478
MOOSE RACING
$81.65A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising here invites oil leaks, compression loss, and catastrophic failure. The MOOSE RACING Motor Gasket Kit eliminates guesswork by supplying every gasket and seal...09341003- SKU:
- 09341003
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$81.65 -
MOOSE RACING Top End Gasket Kit - YZ450 810687
MOOSE RACING
$77.42A quality top-end gasket kit is essential when rebuilding a YZ450—worn seals and gaskets compromise compression, invite oil leaks, and undermine engine reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent sealing with U.S.-made...09341005- SKU:
- 09341005
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$77.42 -
VESRAH Exhaust Gasket VE-1002
VESRAH
$11.95Exhaust leaks compromise both performance and longevity—a degraded gasket allows unmetered air into your exhaust system, throwing off fuel trim and losing power. The VESRAH VE-1002 delivers a factory-quality seal that eliminates leaks at the source,...VX1002- SKU:
- VX1002
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 10 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$11.95 -
VESRAH Exhaust Gasket VE-1003
VESRAH
$16.95Exhaust gasket failure leads to performance loss, increased emissions, and potential engine damage—making reliable sealing critical for any serious build. The VESRAH VE-1003 delivers consistent, high-temperature performance across multiple installations,...VX1003- SKU:
- VX1003
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
$16.95 -
VESRAH Exhaust Gasket VE-1005
VESRAH
$35.21Exhaust leaks compromise horsepower, increase emissions, and create annoying drone under acceleration. The VESRAH VE-1005 exhaust gasket pack delivers the precise seal your exhaust manifold needs to maintain system integrity and performance. With ten...VX1005- SKU:
- VX1005
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
$35.21 -
MOOSE RACING Head Cover Gasket - CRF450X 819159
MOOSE RACING
$8.72Head cover gaskets are critical sealing components that prevent oil leakage from your engine's valve cover—a failure here means mess, contamination, and potential engine damage. OEM replacements carry premium pricing, but this Moose Racing gasket...09346570- SKU:
- 09346570
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
$8.72 -
MOOSE RACING Head Cover Gasket - KTM/Husqvarna 819208
MOOSE RACING
$13.18Head cover gaskets are critical sealing components that prevent oil leakage from your engine's valve cover—a failure here means costly oil loss and potential engine damage. The MOOSE RACING Head Cover Gasket delivers OEM-quality sealing at a fraction of...09346586- SKU:
- 09346586
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
$13.18 -
MOOSE RACING Clutch Cover Gasket 816346
MOOSE RACING
$14.45A leaking clutch cover gasket compromises engine sealing and can lead to oil loss during hard racing or spirited driving. The MOOSE RACING Clutch Cover Gasket 816346 delivers OEM-equivalent performance at a fraction of OEM pricing, using high-tech...09346589- SKU:
- 09346589
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$14.45
