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 Top End Gasket Kit - RM 125 810547
MOOSE RACING
$29.14A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability using...M810547- SKU:
- M810547
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.14 -
MOOSE RACING Motor Gasket Kit with Seal - KDX200 811440
MOOSE RACING
$91.46A complete engine and transmission rebuild demands precision-fit gaskets and seals—any compromise on fit or material quality leads to leaks, performance loss, and costly rework. The MOOSE RACING...M811440- SKU:
- M811440
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$91.46 -
MOOSE RACING Water Pump Rebuild Kit 821577
MOOSE RACING
$54.29A failing water pump can compromise your engine's cooling system and sideline you mid-season. This comprehensive MOOSE RACING rebuild kit gives you every gasket, seal, bearing, and snap ring needed...09345242- SKU:
- 09345242
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$54.29Qty in Cart: 0Quantity:Price:$54.29Subtotal: -
MOOSE RACING Motor Seals - KTM 822359
MOOSE RACING
$59.39Engine seal degradation is one of the most common causes of oil leaks and compression loss in high-mileage builds. MOOSE RACING Motor Seals give you a complete, cost-effective solution for full...09350543- SKU:
- 09350543
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$59.39Qty in Cart: 0Quantity:Price:$59.39Subtotal: -
MOOSE RACING Clutch Cover - Honda D70-1425MB
MOOSE RACING
$152.95Stock clutch covers are prone to thermal stress and premature wear in high-performance applications. The MOOSE RACING Clutch Cover upgrades you to aircraft-quality aluminum construction that...09401852- SKU:
- 09401852
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
$152.95Qty in Cart: 0Quantity:Price:$152.95Subtotal: -
MOOSE RACING Top End Gasket Kit - KLR 250 810459
MOOSE RACING
$71.42A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit for KLR 250 delivers OEM-quality components at a...M810459- SKU:
- M810459
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$71.42 -
MOOSE RACING Top End Gasket Kit - KLX 300 810461
MOOSE RACING
$33.51A 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 gives you OEM-quality components at a fraction...M810461- SKU:
- M810461
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$33.51 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811422
MOOSE RACING
$69.40A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. This Moose Racing kit eliminates the guesswork of sourcing individual...M811422- SKU:
- M811422
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$69.40Qty in Cart: 0Quantity:Price:$69.40Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811423
MOOSE RACING
$75.98A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or budget. The MOOSE RACING Motor Gasket Kit delivers OEM-equivalent sealing...M811423- SKU:
- M811423
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$75.98 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811425
MOOSE RACING
$99.86A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your KX125's performance or reliability. This MOOSE Racing kit eliminates the guesswork by...M811425- SKU:
- M811425
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$99.86 -
MOOSE RACING Motor Gasket Kit with Seal - XR650L 811281
MOOSE RACING
$135.61A complete engine and transmission rebuild requires precision gaskets and seals that won't compromise your XR650L's integrity or performance. MOOSE Racing gasket kits deliver OEM-quality seals at a...M811281- SKU:
- M811281
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
$135.61 -
LA Sleeve Cylinder Sleeve for 2004 Honda CR125R 54mm Bore H5568
LA SLEEVE
$127.95When your CR125R's cylinder wall shows signs of wear—loss of compression, increased blow-by, and declining power delivery—a quality sleeve restores original performance without requiring a full...09310059- SKU:
- 09310059
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- TYPE:
- AC
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
MOOSE RACING Engine Oil Seal Kit - Honda 822315
MOOSE RACING
$56.32Engine oil seals are critical wear items that prevent costly oil leakage and maintain proper engine pressure—ignoring degraded seals can lead to oil starvation and catastrophic engine damage. This...09351023- SKU:
- 09351023
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- TYPE:
- OIL
$56.32Qty in Cart: 0Quantity:Price:$56.32Subtotal: -
LA Sleeve Cylinder Sleeve for 1997-2005 Kawasaki KDX220R 69mm Bore KA5319
LA SLEEVE
$131.95If your KDX220R is showing signs of worn cylinder walls—loss of compression, increased blowby, or sluggish throttle response—a cylinder sleeve is often the most cost-effective way to restore...09310083- SKU:
- 09310083
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 69.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$131.95 -
LA Sleeve Cylinder Sleeve for Honda XR-650L 1993-2023 H5160
LA SLEEVE
$131.95If your XR-650L is showing signs of blow-by, loss of compression, or rough idle, a worn cylinder is likely the culprit. The LA Sleeve H5160 restores your engine to factory specifications without...09310151- SKU:
- 09310151
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 100.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- COLOR/FINISH:
- ALUMINUM
- UNITS:
- EACH
$131.95 -
LA Sleeve Cylinder Rebuild Kit for 1998-2000 Kawasaki KX80 LAS-5351K
LA SLEEVE
$312.95If your KX80 is showing signs of wear—loss of compression, reduced ring seal, or sluggish power delivery—a top-end rebuild is the most cost-effective way to restore factory performance or exceed it...09310384- SKU:
- 09310384
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- CAST
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
MOOSE RACING Oil Pump Cover - KTM/Husky T04-5102B
MOOSE RACING
$32.95Engine oil management is critical to maintaining peak performance and longevity in high-stress racing applications. The stock oil pump cover on your KTM or Husqvarna can become a heat liability,...09401937- SKU:
- 09401937
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- TYPE:
- OIL PUMP
- UNITS:
- EACH
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
MOOSE RACING Oil Filter Cover - Kawasaki T14-2301GB
MOOSE RACING
$32.95Your engine's oil system runs hotter under sustained track conditions, and standard plastic covers can't handle the thermal stress. The MOOSE RACING Oil Filter Cover replaces that weak point with...09401941- SKU:
- 09401941
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- MACHINED
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- OIL FILTER
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
MOOSE RACING Engine Oil Seal Kit - Honda 822219
MOOSE RACING
$31.85Engine oil seals are critical barriers that prevent oil leakage and maintain proper lubrication pressure throughout your engine's operation. Worn or degraded seals compromise performance, invite...09351020- SKU:
- 09351020
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- OIL
$31.85Qty in Cart: 0Quantity:Price:$31.85Subtotal: -
MOOSE RACING Water Pump Cover - Black - Gas Gas I04-5255B
MOOSE RACING
$79.95Your stock water pump cover is vulnerable to damage from debris, impact, and thermal stress—especially under racing conditions. The MOOSE RACING Water Pump Cover upgrades you to a more durable...09401934- SKU:
- 09401934
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- WATER PUMP
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal:
