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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ACERBIS X-Power Cover Kit - Black - KTM/Husqvarna 2645510001
ACERBIS
$76.95If you're running your KTM or Husqvarna hard in dusty conditions or tight terrain, engine cover damage means costly repairs and downtime. The ACERBIS X-Power Cover Kit shields your crankcase and...09401764- SKU:
- 09401764
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$76.95 -
MOOSE RACING Clutch Cover - Kawasaki 250 D70-2423MB
MOOSE RACING
$152.95The stock clutch cover on your Kawasaki 250 is vulnerable to heat damage and impact stress during aggressive riding or racing. This MOOSE Racing clutch cover upgrades you to aircraft-grade aluminum...09401857- SKU:
- 09401857
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
$152.95 -
MOOSE RACING Clutch Cover - Kawasaki 450 D70-2424MB
MOOSE RACING
$152.95The stock clutch cover on your Kawasaki 450 is vulnerable to heat damage and potential failure under aggressive riding conditions. This MOOSE RACING replacement upgrades you to aircraft-grade...09401858- SKU:
- 09401858
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
$152.95 -
On Sale
MOOSE RACING Clutch Cover - Kawasaki 450 D70-2425MB
MOOSE RACING
MSRP: $156.95Now: $100.00Was: $156.95Your stock clutch cover is the weak link in high-stress riding conditions. The MOOSE RACING clutch cover replaces it with aircraft-grade aluminum construction that runs cooler, lasts longer, and...09401859- SKU:
- 09401859
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
MSRP: $156.95Now: $100.00Was: $156.95 -
MOOSE RACING Clutch Cover - Suzuki 250Z D70-3421MB
MOOSE RACING
$157.95Your clutch cover endures extreme thermal and mechanical stress during aggressive riding—the OEM unit simply wasn't engineered for sustained high-performance use. This MOOSE RACING cover replaces...09401860- SKU:
- 09401860
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$157.95 -
MOOSE RACING Clutch Cover - Yamaha 250F D70-4475MB
MOOSE RACING
$159.95The stock clutch cover on your YZ250F takes a beating—especially in high-RPM racing conditions where heat and impact are constant threats. This MOOSE RACING clutch cover replaces that vulnerable OEM...09401865- SKU:
- 09401865
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$159.95 -
MOOSE RACING Clutch Cover - Yamaha 450F D70-4421MB
MOOSE RACING
$157.95The stock clutch cover on your Yamaha 450F is a potential weak point under sustained racing loads and high operating temperatures. This MOOSE RACING replacement upgrades you to aircraft-grade...09401866- SKU:
- 09401866
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$157.95 -
MOOSE RACING Ignition Cover - Yamaha 450F D70-4474MB
MOOSE RACING
$269.95Your stock ignition cover is a weak point in your engine's thermal management and structural integrity. Moose Racing's billet aircraft-grade aluminum replacement handles the heat your 450F generates...09401867- SKU:
- 09401867
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
$269.95 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811231
MOOSE RACING
$90.04A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or wallet. MOOSE Racing delivers genuine OEM-equivalent seals at a fraction of OEM...M811231- SKU:
- M811231
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$90.04 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811232
MOOSE RACING
$91.46A complete engine and transmission rebuild demands precision gaskets and seals—factory tolerances won't tolerate improvisation. The MOOSE RACING Motor Gasket Kit delivers OEM-equivalent performance...M811232- SKU:
- M811232
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$91.46 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811233
MOOSE RACING
$99.86A complete engine and transmission rebuild requires gaskets and seals that won't fail under load. The MOOSE RACING Motor Gasket Kit eliminates the frustration of sourcing individual components from...M811233- SKU:
- M811233
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$99.86Qty in Cart: 0Quantity:Price:$99.86Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811663
MOOSE RACING
$68.97A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. This MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a...M811663- SKU:
- M811663
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$68.97 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811664
MOOSE RACING
$68.97A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—and OEM replacements drain your budget fast. The MOOSE RACING Motor Gasket Kit delivers...M811664- SKU:
- M811664
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$68.97 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811666
MOOSE RACING
$64.70A complete engine and transmission rebuild demands precision-fit gaskets and seals—and OEM pricing shouldn't dictate your budget. This Moose Racing Motor Gasket Kit delivers genuine OEM-quality...M811666- SKU:
- M811666
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$64.70 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811667
MOOSE RACING
$84.39A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your YZ250's reliability or performance. This Moose Racing kit eliminates the guesswork of...M811667- SKU:
- M811667
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
$84.39 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811668
MOOSE RACING
$81.65A complete engine and transmission rebuild demands OEM-quality gaskets and seals without the OEM price tag. This Moose Racing Motor Gasket Kit delivers genuine oil seals paired with precision-formed...M811668- SKU:
- M811668
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$81.65 -
MOOSE RACING Motor Gasket Kit with Seal - YZ250 811669
MOOSE RACING
$80.18A complete engine and transmission rebuild demands precision components that won't compromise durability or break your budget. The MOOSE RACING Motor Gasket Kit eliminates the guesswork by bundling...M811669- SKU:
- M811669
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$80.18 -
MOOSE RACING Top End Gasket Kit - CR125 810236
MOOSE RACING
$41.54When you're rebuilding a CR125 top end, precision gaskets and seals aren't optional—they're essential to engine integrity and reliability. This Moose Racing kit eliminates the guesswork by including...M810236- SKU:
- M810236
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$41.54 -
MOOSE RACING Top End Gasket Kit - CR125R 810237
MOOSE RACING
$42.99A top-end rebuild demands precision gaskets and seals that won't fail mid-season—this Moose Racing kit delivers OEM-quality components at a fraction of dealership pricing. Whether you're refreshing a...M810237- SKU:
- M810237
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$42.99 -
MOOSE RACING Top End Gasket Kit - XR200 810240
MOOSE RACING
$49.88A top-end rebuild demands precision-fit gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance...M810240- SKU:
- M810240
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$49.88
