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!
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- Quantity
- Price
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MOOSE OFFROAD Gasket Clutch Inner - Honda 816326MSE
MOOSE OFFROAD
$23.36A worn or damaged clutch inner gasket compromises engine sealing and invites oil leakage that degrades performance and reliability. This MOOSE OFFROAD gasket delivers OEM-level precision to restore...09346894- SKU:
- 09346894
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.36 -
MOOSE OFFROAD Gasket Clutch Inner 816341MSE
MOOSE OFFROAD
$20.73A worn or degraded clutch inner gasket compromises your ignition cover's seal, leading to oil seepage, contamination, and potential clutch performance loss. The MOOSE OFFROAD 816341MSE delivers a...09346896- SKU:
- 09346896
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$20.73 -
MOOSE OFFROAD Top End Gasket Set - Gas Gas/Husqvarna/KTM 8100035MSE
MOOSE OFFROAD
$73.01A top-end rebuild demands precision—and this complete gasket set eliminates the guesswork by bundling every seal you need in one package. Whether you're refreshing a high-mileage engine or performing...09346915- SKU:
- 09346915
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$73.01 -
MOOSE OFFROAD Head Cover Gasket - Yamaha 819200MSE
MOOSE OFFROAD
$51.54A leaking valve cover gasket compromises engine efficiency and risks oil contamination of critical engine components. MOOSE OFFROAD Head Cover Gaskets deliver OEM-equivalent sealing performance at a...09346943- SKU:
- 09346943
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
$51.54 -
MOOSE OFFROAD Motor Gasket Kit with Oil Seal - Honda 811285MSE
MOOSE OFFROAD
$179.68Engine rebuilds demand precision sealing to prevent oil leaks, compression loss, and catastrophic failure—this comprehensive gasket kit delivers OEM-quality components without the OEM price tag...09342209- SKU:
- 09342209
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
$179.68 -
MOOSE OFFROAD Valve Seal Kit M60-60490
MOOSE OFFROAD
$15.95OEM valve seals wear out and leak, causing blow-by, oil consumption, and performance loss. The MOOSE OFFROAD Valve Seal Kit M60-60490 replaces your factory seals with precision-engineered components...09262826- SKU:
- 09262826
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$15.95 -
PROX Top End Gasket Set - Kawasaki KX 450 F 35.4419
PROX
$93.95A top-end rebuild demands precision gaskets that won't fail under combustion pressures and extreme heat cycles. The PROX Top End Gasket Set eliminates the risk of compression leaks and coolant...09345771- SKU:
- 09345771
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$93.95 -
PROX Top End Gasket Set - Honda 35.1348
PROX
$84.95A failing top-end gasket set will compromise cylinder head sealing, leading to coolant leaks, oil seepage, and lost compression—all of which degrade engine performance and reliability. The PROX 35...09347108- SKU:
- 09347108
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$84.95 -
PROX Top End Gasket Set - Honda XR650L 35.1623
PROX
$67.95A top-end rebuild demands precision and reliability—compromise here and you're risking blow-by, compression loss, and catastrophic engine failure. The PROX Top End Gasket Set for the Honda XR650L...09347118- SKU:
- 09347118
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$67.95 -
PROX Top End Gasket Set - Husqvarna/Gas Gas/KTM 35.6216
PROX
$72.95A top-end rebuild demands precision—worn gaskets compromise compression, invite oil seepage, and undermine engine reliability. The PROX Top End Gasket Set delivers the complete seal integrity your...09347147- SKU:
- 09347147
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$72.95 -
SHINDY Needle Bearing - 16 mm x 21 mm x 23 mm - Yamaha 10-301
SHINDY
$11.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM applications where precision tolerances demand perfection. This SHINDY bearing delivers the exact dimensions and...NB1455- SKU:
- NB1455
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$11.95 -
Twin Air Oil Filter Arctic Cat Kawasaki Suzuki 2000-2025 140007
TWIN AIR
$11.95Clean oil is non-negotiable for engine longevity and performance. The Twin Air Oil Filter 140007 delivers reliable contaminant removal to keep your Arctic Cat, Kawasaki, or Suzuki running at peak...140007- SKU:
- 140007
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$11.95 -
VERTEX Top End Piston Kit - 66.35 mm - Yamaha YZ250/X VTK22584B-2
VERTEX
$235.95A worn top end compromises power delivery and throttle response on your YZ250/X. This VERTEX piston kit restores OEM performance with precision-cast components engineered for durability and reliable...09103134- SKU:
- 09103134
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
$235.95 -
VERTEX Piston Kit - 99.95 mm - KTM 23417B
VERTEX
$331.95A quality piston kit is the foundation of reliable engine performance, especially in high-demand racing and off-road applications. The VERTEX 99.95 mm piston kit delivers the durability and power...09102627- SKU:
- 09102627
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
$331.95 -
On Sale
VESRAH Oil Filter - Kawasaki/Suzuki SF-3012
VESRAH
MSRP: $7.00Now: $6.65Was: $7.00Engine protection hinges on filtration quality—contamination and particle buildup reduce oil flow, increase wear, and shorten engine life. The VESRAH SF-3012 uses premium filter media to capture...07120026- SKU:
- 07120026
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $7.00Now: $6.65Was: $7.00 -
On Sale
Wiseco Piston Kit 54.00 mm KTM 125 SX 2001-2024 RE904M05400
WISECO
MSRP: $221.95Now: $174.00Was: $221.95KTM 125 SX engines demand precision internals to handle the demands of competitive riding and high-RPM operation. This Wiseco piston kit delivers the durability and reliability you need to keep your...09105086- SKU:
- 09105086
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit 68.50mm Yamaha YZ250 2002-2020 560M06850
WISECO
MSRP: $219.95Now: $170.00Was: $219.95The Wiseco 68.50mm piston kit restores your YZ250 to factory specifications while delivering the durability and compression needed for consistent high-RPM performance on the track or trail. Factory...560M06850- SKU:
- 560M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $219.95Now: $170.00Was: $219.95 -
On Sale
Wiseco Engine Rebuild Kit 52.50 mm Kawasaki KX100 1995-2013 PWR173-100
WISECO
MSRP: $588.95Now: $484.00Was: $588.95A worn or damaged KX100 engine doesn't just rob you of power—it compromises reliability when you need it most. The Wiseco PWR173-100 rebuild kit gives you factory-engineered components designed to...09031681- SKU:
- 09031681
- Availability:
- Ships Same Business Day
- Weight:
- 7.85 LBS
MSRP: $588.95Now: $484.00Was: $588.95 -
On Sale
WISECO Piston Kit with Gaskets - 68.00 mm - Yamaha WR/YZ 250 PK1563
WISECO
MSRP: $275.95Now: $221.00Was: $275.95A worn or damaged top-end forces catastrophic engine failure and sidelined race time. The WISECO Piston Kit delivers OEM-quality reliability with precision-engineered components matched specifically...09030716- SKU:
- 09030716
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $275.95Now: $221.00Was: $275.95 -
WORKS CONNECTION Engine Plug - Blue - Gas Gas/Husqvarna/KTM 24-450
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and deterioration, compromising both aesthetics and reliability on your high-performance machine. These WORKS CONNECTION plugs deliver the precision fit and...09500977- SKU:
- 09500977
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$30.95
