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 808670
MOOSE RACING
$60.26A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under race conditions or high-mileage wear. The MOOSE RACING Complete Motor Gasket Kit delivers...M808670- SKU:
- M808670
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$60.26 -
MOOSE RACING Complete Motor Gasket Kit - YZ250F/WR250F 808671
MOOSE RACING
$109.78A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or break your budget. This Moose Racing kit delivers OEM-quality components at a...M808671- SKU:
- M808671
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$109.78 -
MOOSE RACING Complete Motor Gasket Kit - YZ400F/WR400F 808675
MOOSE RACING
$111.90A complete engine rebuild demands precision gaskets and seals that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork and expense of...M808675- SKU:
- M808675
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$111.90Qty in Cart: 0Quantity:Price:$111.90Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - Yamaha 808676
MOOSE RACING
$111.90A complete engine and transmission rebuild requires precision-fit gaskets and seals that can withstand demanding operating conditions. The MOOSE RACING Complete Motor Gasket Kit eliminates the...M808676- SKU:
- M808676
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$111.90Qty in Cart: 0Quantity:Price:$111.90Subtotal: -
MOOSE RACING Top End Gasket Kit - CR250R 810261
MOOSE RACING
$47.28When you're rebuilding a CR250R top end, you need gaskets and seals that match OEM precision without the OEM price tag. This Moose Racing kit gives you every component required for a complete top-end...M810261- SKU:
- M810261
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$47.28Qty in Cart: 0Quantity:Price:$47.28Subtotal: -
MOOSE RACING Top End Gasket Kit - XR400 810265
MOOSE RACING
$55.47A top-end rebuild demands precision—and compromising on gaskets invites leaks, compression loss, and premature wear. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a...M810265- SKU:
- M810265
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$55.47 -
LA Sleeve Cylinder Sleeve 66.40mm Bore Suzuki RM250 2003 FL5494
LA SLEEVE
$148.95A worn or damaged cylinder sleeve kills engine performance and reliability. The LA SLEEVE FL5494 restores your RM250's cylinder integrity with precision engineering, delivering the power and...09310147- SKU:
- 09310147
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 66.40mm Bore Suzuki RM250 2006-2008 FL5629
LA SLEEVE
$148.95A worn or damaged cylinder sleeve compromises compression, increases blow-by, and accelerates piston and ring wear—ultimately costing you race wins or reliability on the track. The LA SLEEVE FL5629...09310150- SKU:
- 09310150
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
La Sleeve Sleeve and Piston Kit Yamaha YZ125 2002-2023 LAS-5476K
LA SLEEVE
$312.95The YZ125's top-end takes a beating in competition and trail riding, making a quality sleeve and piston kit essential for restoring compression, power delivery, and engine longevity. LA Sleeve's...09310388- SKU:
- 09310388
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- MATERIAL:
- IRON
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
LA Sleeve YZ125 2005-2017 Sleeve and Piston Kit LAS-5533K-1
LA SLEEVE
$360.95Your YZ125's top-end is the foundation of its power delivery—and factory components wear fast under racing demands. The LA Sleeve Sleeve and Piston Kit delivers a complete, precision-matched rebuild...09310389- SKU:
- 09310389
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- CAST
$360.95Qty in Cart: 0Quantity:Price:$360.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Honda CR250R 2002-2003 LAS-5477K
LA SLEEVE
$422.95When your Honda CR250R's top-end begins to wear, compression loss and power degradation follow quickly. The LA Sleeve Sleeve and Piston Kit restores—and exceeds—original performance by replacing worn...09310383- SKU:
- 09310383
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- IRON
$422.95Qty in Cart: 0Quantity:Price:$422.95Subtotal: -
DEL WEST Intake Valve DW-KX450F-IV06
DEL WEST
$155.95When you're pushing your KX450F to its limits in high-RPM off-road conditions, valve reliability becomes non-negotiable. The DEL WEST Intake Valve DW-KX450F-IV06 is engineered to withstand the...09261057- SKU:
- 09261057
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
MOOSE RACING Oil Seals 822370
MOOSE RACING
$40.60Engine and transmission rebuilds demand precision-fit seals that won't compromise reliability or longevity. MOOSE RACING Oil Seals deliver OEM-equivalent performance at a fraction of dealership...09350947- SKU:
- 09350947
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
$40.60 -
MOOSE RACING Oil Seals 822372
MOOSE RACING
$46.08Engine and transmission seals are critical to maintaining proper oil containment and preventing costly leaks that compromise performance and reliability. When rebuilding or servicing your engine,...09350948- SKU:
- 09350948
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$46.08 -
MOOSE RACING Engine Oil Seal Kit - Honda 822165
MOOSE RACING
$32.32Engine oil seals are critical wear items that prevent oil leakage and maintain proper lubrication pressure throughout your engine. A compromised seal can lead to oil loss, inadequate bearing...09351016- SKU:
- 09351016
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- OIL
$32.32Qty in Cart: 0Quantity:Price:$32.32Subtotal: -
MOOSE RACING Engine Oil Seal Kit - Honda 822180
MOOSE RACING
$18.94Engine oil seals are critical wear items that prevent oil leakage and maintain proper lubrication throughout your engine. A failing seal kit leads to oil loss, reduced bearing protection, and...09351017- SKU:
- 09351017
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- OIL
$18.94 -
MOOSE RACING Engine Oil Seal Kit - Suzuki 822195
MOOSE RACING
$35.24Engine oil seals deteriorate over time, leading to costly leaks that compromise performance and engine longevity. This complete seal kit from MOOSE Racing replaces all critical engine seals—including...09351018- SKU:
- 09351018
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- OIL
- UNITS:
- KIT
- APPLICATION:
- ENGINE
$35.24Qty in Cart: 0Quantity:Price:$35.24Subtotal: -
MOOSE RACING Engine Oil Seal Kit - Yamaha 822196
MOOSE RACING
$21.56Engine oil seals are critical wear items that prevent costly leaks and maintain proper lubrication throughout your engine. A complete seal kit replacement ensures you address all potential leak...09351019- SKU:
- 09351019
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$21.56 -
MOOSE RACING Engine Oil Seal Kit - Honda 822332
MOOSE RACING
$62.26Engine seals degrade over time, leading to oil leaks that compromise performance and can cause catastrophic damage if left unaddressed. This MOOSE Racing Engine Oil Seal Kit gives you a complete...09351025- SKU:
- 09351025
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$62.26 -
MOOSE RACING Magnetic Drain Plug T14-6085S
MOOSE RACING
$17.95Engine wear doesn't happen all at once—it accumulates through microscopic metal particles suspended in your oil. The MOOSE RACING Magnetic Drain Plug T14-6085S captures ferrous debris before it...09200196- SKU:
- 09200196
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- COLOR/FINISH:
- ANODIZED CLEAR
- DIAMETER - THREAD SIZE METRIC:
- M12 X 1.50 X 15 MM
- COLOR/FINISH:
- SILVER
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
$17.95
