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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- Price
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HOT RODS Crankshaft Kit - OE Crankshaft Replacement - Kawasaki CBK0118
HOT RODS
$795.95A crankshaft failure means complete engine shutdown—and an expensive rebuild. The HOT RODS Crankshaft Kit gives you a factory-spec replacement that's assembled, inspected, and ready to bolt in,...09210355- SKU:
- 09210355
- Availability:
- Ships Same Business Day
- Weight:
- 13.35 LBS
$795.95Qty in Cart: 0Quantity:Price:$795.95Subtotal: -
HOT RODS Crankshaft Bearings - Honda K073
HOT RODS
$83.95A crankshaft rebuild demands precision-matched bearings and seals—using inferior components will compromise oil pressure, increase friction, and risk catastrophic engine failure. The HOT RODS K073...09240248- SKU:
- 09240248
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$83.95 -
MOOSE OFFROAD Gasket Clutch Inner - Honda 332003MSE
MOOSE OFFROAD
$21.87A failing clutch inner gasket compromises your Honda's seal integrity, leading to oil weeping, contamination, and potential clutch slip. This MOOSE OFFROAD replacement restores a factory-tight seal...09346908- SKU:
- 09346908
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$21.87Qty in Cart: 0Quantity:Price:$21.87Subtotal: -
MOOSE OFFROAD Outer Clutch Cover Gasket - Honda 819160MSE
MOOSE OFFROAD
$7.31A failing outer clutch cover gasket compromises engine sealing and invites oil leakage that accelerates wear on adjacent components. Whether you're doing a full clutch replacement or addressing a...09346921- SKU:
- 09346921
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$7.31Qty in Cart: 0Quantity:Price:$7.31Subtotal: -
MOOSE OFFROAD Complete Gasket Set - Yamaha 8080037MSE
MOOSE OFFROAD
$146.11A complete engine rebuild demands precision at every seal and gasket—any leak or failure compromises performance and reliability. This MOOSE OFFROAD Complete Gasket Set eliminates guesswork by...09346924- SKU:
- 09346924
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$146.11 -
MOOSE OFFROAD Complete Gasket Set 808616MSE
MOOSE OFFROAD
$67.11A complete engine or transmission rebuild demands precision at every seal and gasket—one leak or premature failure compromises hours of work and thousands in parts. This MOOSE OFFROAD Complete Gasket...09346925- SKU:
- 09346925
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$67.11Qty in Cart: 0Quantity:Price:$67.11Subtotal: -
MOOSE OFFROAD Complete Gasket Set - Yamaha 808691MSE
MOOSE OFFROAD
$128.89A complete engine rebuild demands precision sealing at every junction—missed gaskets mean oil leaks, compression loss, and premature failure. This MOOSE OFFROAD Complete Gasket Set eliminates...09346926- SKU:
- 09346926
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$128.89 -
MOOSE OFFROAD Top End Gasket Kit - Yamaha 8100031MSE
MOOSE OFFROAD
$87.56A top-end rebuild demands precision-fit gaskets and seals that won't fail under load—and OEM replacements come with premium pricing. The MOOSE OFFROAD Top End Gasket Kit delivers OEM-quality seals...09346927- SKU:
- 09346927
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$87.56 -
MOOSE OFFROAD Gasket Set with Seals - Yamaha 811691MSE
MOOSE OFFROAD
$179.43A complete engine and transmission rebuild demands precision sealing at every joint—missed gaskets or degraded seals lead to oil leaks, compression loss, and premature wear. This MOOSE OFFROAD gasket...09346928- SKU:
- 09346928
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
$179.43 -
MOOSE OFFROAD Gasket Clutch Inner - Yamaha 816097MSE
MOOSE OFFROAD
$11.51A worn or compromised clutch gasket will cost you reliability on the track or trail. This MOOSE Offroad gasket seals your ignition cover and clutch assembly against oil leakage, preventing...09346931- SKU:
- 09346931
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$11.51 -
MOOSE OFFROAD Complete Motor Gasket Kit - Suzuki 808547MSE
MOOSE OFFROAD
$67.01A complete engine rebuild demands precision gaskets and seals that won't fail under load—OEM kits come with premium pricing that doesn't match the performance. The MOOSE OFFROAD Complete Motor Gasket...09340132- SKU:
- 09340132
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$67.01 -
On Sale
KIBBLEWHITE Piston System 80-81200
KIBBLEWHITE
MSRP: $732.91Now: $659.62Was: $732.91If you're serious about maximizing compression without compromising reliability, the KIBBLEWHITE Piston System 80-81200 is engineered to deliver exactly that. The convex valve reliefs are precisely...09031304- SKU:
- 09031304
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $732.91Now: $659.62Was: $732.91Qty in Cart: 0Quantity:Price:MSRP: $732.91Now: $659.62Was: $732.91Subtotal: -
MOOSE OFFROAD Oil Cap - Blue - Husqvarna T14-6301L
MOOSE OFFROAD
$28.95A quality oil cap might seem like a small detail, but it's a critical seal protecting your engine from contamination and fluid loss—especially in demanding off-road conditions. The MOOSE OFFROAD oil...09500968- SKU:
- 09500968
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$28.95 -
MOOSE OFFROAD Top End Gasket Kit - Suzuki 810584MSE
MOOSE OFFROAD
$35.01A top-end rebuild demands precision gaskets and seals that maintain compression and prevent oil weeping—this kit delivers everything you need in one box. Whether you're refreshing a stock engine or...M810584- SKU:
- M810584
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$35.01 -
MOOSE OFFROAD Top End Gasket Kit - Yamaha 810659MSE
MOOSE OFFROAD
$33.51A top-end rebuild demands precision gaskets and seals that won't fail under compression and heat cycling—cheap or worn gaskets lead to oil leaks, loss of compression, and engine damage. The MOOSE...M810662- SKU:
- M810662
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$33.51Qty in Cart: 0Quantity:Price:$33.51Subtotal: -
MOOSE OFFROAD Oil Seal Set - Yamaha 822272MSE
MOOSE OFFROAD
$15.87A complete engine and transmission rebuild demands precision sealing to prevent oil leakage, compression loss, and contamination. This MOOSE OFFROAD Oil Seal Set gives you every gasket and seal...09351182- SKU:
- 09351182
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$15.87Qty in Cart: 0Quantity:Price:$15.87Subtotal: -
MOOSE OFFROAD Oil Seal Set - KTM 822222MSE
MOOSE OFFROAD
$21.61A complete engine and transmission rebuild demands precision sealing to prevent oil leakage and maintain compression integrity. This MOOSE OFFROAD Oil Seal Set delivers all the OEM-equivalent gaskets...09351183- SKU:
- 09351183
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$21.61 -
MOOSE OFFROAD Oil Seals 822224MSE
MOOSE OFFROAD
$28.94Engine and transmission rebuilds demand precision seals that won't compromise your freshly machined components. MOOSE OFFROAD Oil Seals deliver OEM-equivalent fitment and durability at a fraction of...09351175- SKU:
- 09351175
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$28.94Qty in Cart: 0Quantity:Price:$28.94Subtotal: -
MOOSE OFFROAD Oil Seals 822336MSE
MOOSE OFFROAD
$35.81Engine and transmission rebuilds demand seals that won't compromise your work or your reputation. MOOSE OFFROAD Oil Seals deliver OEM-equivalent reliability at a fraction of dealership pricing, so...09351176- SKU:
- 09351176
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$35.81Qty in Cart: 0Quantity:Price:$35.81Subtotal: -
MOOSE OFFROAD Oil Seals 822399MSE
MOOSE OFFROAD
$13.05Oil seals are critical components that prevent fluid leakage and maintain pressure integrity in your engine and transmission—neglect them during a rebuild and you risk catastrophic failure. The MOOSE...09351177- SKU:
- 09351177
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$13.05
