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 Complete Motor Gasket Kit - YZ250 808666
MOOSE RACING
$48.17A complete engine and transmission rebuild demands precision gasket and seal replacement—compromised sealing surfaces invite oil leaks, contamination, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by bundling...M808666- SKU:
- M808666
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$48.17 -
MOOSE RACING Complete Motor Gasket Kit - YZ250 808668
MOOSE RACING
$61.34A complete engine and transmission rebuild demands gasket and seal integrity—any compromise leads to leaks, loss of compression, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality sealing components at a fraction of...M808668- SKU:
- M808668
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$61.34 -
MOOSE RACING Top End Gasket Kit - YZ 80 810611
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to reassemble...M810611- SKU:
- M810611
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Top End Gasket Kit - YZ 80 810612
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, using high-tech materials engineered for...M810612- SKU:
- M810612
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Top End Gasket Kit - YZ 80 810613
MOOSE RACING
$21.90When you're rebuilding a YZ 80 top end, using OEM-equivalent gaskets and seals isn't optional—it's essential for preventing oil leaks, maintaining compression, and ensuring your engine performs reliably. The MOOSE RACING Top End Gasket Kit gives you...M810613- SKU:
- M810613
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$21.90 -
MOOSE RACING Top End Gasket Kit - YZ 85 810614
MOOSE RACING
$24.35A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to confidently refresh your YZ...M810614- SKU:
- M810614
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$24.35 -
MOOSE RACING Motor Seals - KX250F 822977
MOOSE RACING
$62.53Engine seal failure can lead to catastrophic oil leaks and internal damage—rebuilding with worn or substandard seals is a recipe for disaster. MOOSE Racing Motor Seals deliver OEM-equivalent fitment and material quality at a fraction of factory pricing,...09350973- SKU:
- 09350973
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- UNITS:
- SET
- TYPE:
- OIL
$62.53 -
MOOSE RACING Motor Seals - CRF450 822989
MOOSE RACING
$59.35Engine seal degradation is inevitable—but catastrophic failure isn't. MOOSE RACING Motor Seals give you OEM-equivalent reliability at a fraction of the cost, so you can rebuild your CRF450 with confidence. This complete seal kit eliminates the guesswork...09350974- SKU:
- 09350974
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- ENGINE
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
$59.35 -
MOOSE RACING Complete Motor Gasket Kit 808372
MOOSE RACING
$127.66A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. This MOOSE RACING kit eliminates the hassle of sourcing individual components, giving you every gasket, o-ring, and seal needed in one...09345878- SKU:
- 09345878
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
$127.66 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 808376
MOOSE RACING
$130.03A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork of sourcing individual components, giving you every gasket, o-ring, and seal...09345879- SKU:
- 09345879
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$130.03Qty in Cart: 0Quantity:Price:$130.03Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - RM125 811549
MOOSE RACING
$102.28A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your budget. This MOOSE RACING gasket kit eliminates the guesswork and expense of sourcing OEM components individually, giving you...M811549- SKU:
- M811549
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$102.28 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811574
MOOSE RACING
$80.18A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your wallet. Moose Racing's motor gasket kit delivers OEM-quality components at a fraction of dealership pricing, so you can rebuild...M811574- SKU:
- M811574
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$80.18 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811575
MOOSE RACING
$90.04A complete engine and transmission rebuild demands gaskets and seals that match OEM specifications without the OEM price tag. This MOOSE RACING kit eliminates sourcing individual components by bundling everything you need in one purchase, letting you...M811575- SKU:
- M811575
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$90.04 -
MOOSE RACING Motor Gasket Kit with Seal - YZ80 811612
MOOSE RACING
$49.23A complete engine and transmission rebuild demands precision components that won't compromise your performance or reliability. MOOSE Racing's gasket and seal kit eliminates the guesswork of sourcing individual seals and gaskets, delivering genuine...M811612- SKU:
- M811612
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$49.23 -
LA Sleeve Cylinder Rebuild Kit for 2000-2006 Honda TRX350TE FourTrax Rancher ES LAS-5443K
LA SLEEVE
$312.95When your Honda TRX350TE Rancher's top-end starts losing compression and efficiency, a quality rebuild kit is the most cost-effective way to restore original performance—or exceed it. The LA Sleeve Cylinder Rebuild Kit delivers a complete solution with a...09310356- SKU:
- 09310356
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$312.95 -
LA Sleeve Cylinder Sleeve 85mm Bore Honda TRX400FA 2004-2007 H5630
LA SLEEVE
$117.95A worn cylinder bore reduces compression, kills power output, and forces you to rebuild or replace the entire engine. The LA Sleeve H5630 restores your TRX400FA to factory specifications without the expense of a complete engine replacement. This...09310371- SKU:
- 09310371
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
MOOSE RACING Oil Pump Cover - KTM/Husky T04-5103B
MOOSE RACING
$32.95Protecting your engine's oil system while managing thermal stress is critical for sustained performance on the track or trail. The MOOSE RACING Oil Pump Cover replaces factory plastic components with precision-engineered aluminum that actively dissipates...09401938- SKU:
- 09401938
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 T-6 ALUMINUM
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- TYPE:
- OIL PUMP
- UNITS:
- EACH
$32.95 -
MOOSE RACING Oil Filter Cover - Yamaha T14-4300GB
MOOSE RACING
$42.95Engine oil temperature management directly impacts performance consistency and component longevity, especially in high-demand racing applications. The MOOSE RACING Oil Filter Cover replaces stock plastic covers with precision-machined aluminum that...09401939- SKU:
- 09401939
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- TYPE:
- OIL FILTER
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- 6061 T-6 ALUMINUM
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal: -
MOOSE RACING Motor Gasket Kit with Oil Seal - 50 Adventure A/C 811314
MOOSE RACING
$40.75A complete engine and transmission rebuild demands precision components that won't compromise reliability or drain your wallet. This MOOSE RACING Motor Gasket Kit delivers OEM-quality seals and gaskets at a fraction of dealership pricing, letting you...09340467- SKU:
- 09340467
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$40.75 -
MOOSE RACING Second Oil Filter - Stainless Steel - KTM DT-09-51S
MOOSE RACING
$27.95Stock paper oil filters sacrifice flow consistency under extreme thermal stress—a critical vulnerability in high-performance engines where oil temperature swings demand reliable filtration. The MOOSE RACING Second Oil Filter eliminates this weakness with...07120235- SKU:
- 07120235
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- BASE COLOR:
- SILVER
- MATERIAL:
- STAINLESS STEEL
- MICRON RATING:
- 35 MICRONS
- STYLE:
- SECOND FILTER FOR DUAL FILTER APPLICATIONS
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- FILTER MEDIA MATERIAL:
- MICRONIC FILTER CLOTH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
$27.95
