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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MOOSE OFFROAD Cam Chain - 98XRH2015 x 80 Links MSEHC98XRH2015080
MOOSE OFFROAD
$51.95A worn or damaged cam chain compromises valve timing precision and can lead to catastrophic engine failure. The MOOSE OFFROAD Cam Chain 98XRH2015 x 80 Links delivers OEM-equivalent reliability with shot-peened solid bushings engineered to handle...09251438- SKU:
- 09251438
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
$51.95 -
MOOSE OFFROAD Cam Chain - 98XRH2010 x 118 Links MSEHC98XRH2010118
MOOSE OFFROAD
$62.95A worn or damaged cam chain compromises valve timing precision, leading to poor engine performance, increased wear, and potential catastrophic engine failure. The MOOSE OFFROAD Cam Chain delivers OEM-equivalent reliability with superior material...09251439- SKU:
- 09251439
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$62.95 -
MOOSE OFFROAD Cam Chain - 98XRH2010 x 114 Links MSEHC98XRH2010114
MOOSE OFFROAD
$41.95A worn or damaged cam chain compromises valve timing precision and can lead to catastrophic engine failure. The MOOSE OFFROAD Cam Chain delivers OEM-equivalent reliability with premium materials engineered to handle both stock and modified powertrains...09251440- SKU:
- 09251440
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
$41.95 -
MOOSE OFFROAD Cam Chain - 92RH2015 x 108 Links MSEHC92RH2015108
MOOSE OFFROAD
$71.95A worn or compromised cam chain directly impacts valve timing precision and engine reliability—two non-negotiables for any serious build. The MOOSE OFFROAD 92RH2015 x 108 Links cam chain combines OEM-equivalent durability with select steel alloys...09251441- SKU:
- 09251441
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$71.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00117
HOT RODS
$1,591.95If you're planning a complete bottom-end rebuild on your Polaris, this kit eliminates the guesswork by bundling everything you need in one package. Rather than sourcing bearings, seals, and gaskets separately, you get HOT RODS-quality components...09210896- SKU:
- 09210896
- Availability:
- Ships Same Business Day
- Weight:
- 24.85 LBS
$1,591.95 -
MOOSE OFFROAD Crank Bearing/Seal Kit - Beta 24-1122
MOOSE OFFROAD
$59.95Your crankshaft is the heart of your engine's reliability and longevity. Worn or damaged crank bearings accelerate internal wear, reduce power transmission efficiency, and can lead to catastrophic engine failure. The MOOSE OFFROAD Crank Bearing/Seal Kit...09240643- SKU:
- 09240643
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$59.95 -
MOOSE OFFROAD Crank Bearing/Seal Kit - Beta 24-1123
MOOSE OFFROAD
$79.95A worn or failing crankshaft bearing kit compromises engine reliability and performance—especially critical in 2-stroke engines where precision tolerances are unforgiving. The MOOSE OFFROAD Crank Bearing/Seal Kit keeps your crankshaft spinning true with...09240644- SKU:
- 09240644
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
$79.95 -
MOOSE OFFROAD Crank Bearing/Seal Kit - Beta 24-1128
MOOSE OFFROAD
$109.95Worn crankshaft bearings compromise engine reliability and performance—replace them before catastrophic failure occurs. This complete bearing and seal kit restores optimal crankshaft clearances and eliminates leakage points, critical for maintaining...09240645- SKU:
- 09240645
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
$109.95 -
MOOSE OFFROAD Oil Seal Gasket Kit - Honda 822999MSE
MOOSE OFFROAD
$6.52Engine seal degradation is one of the most common culprits behind oil leaks and loss of compression in high-mileage builds. This comprehensive gasket kit from MOOSE Offroad eliminates the guesswork by providing every critical seal your Honda engine needs...09351196- SKU:
- 09351196
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$6.52 -
MOOSE OFFROAD Oil Seal Gasket Kit - Gas Gas/Husqvarna/KTM 822348MSE
MOOSE OFFROAD
$47.13Engine seal degradation leads to oil leaks, compromised compression, and catastrophic engine failure—especially critical in high-demand off-road conditions where reliability is non-negotiable. This comprehensive gasket kit eliminates the guesswork by...09351197- SKU:
- 09351197
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
$47.13 -
MOOSE OFFROAD Gasket Kit with Oil Seal - Honda 8110043MSE
MOOSE OFFROAD
$112.56A complete engine and transmission rebuild demands precision—and compromised gaskets or seals will undermine even the best machine work. This MOOSE OFFROAD Gasket Kit gives you factory-correct sealing surfaces across your entire drivetrain, eliminating...09347197- SKU:
- 09347197
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$112.56 -
MOOSE OFFROAD Complete Motor Gasket Kit - Honda 808213MSE
MOOSE OFFROAD
$169.49A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or performance. MOOSE Offroad delivers a comprehensive kit with all necessary components at a fraction of OEM pricing, letting you rebuild...09347198- SKU:
- 09347198
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$169.49 -
MOOSE OFFROAD Top End Gasket Kit - Honda 8100042MSE
MOOSE OFFROAD
$106.05A top-end rebuild demands precision gasket-to-surface contact—any compromise in material quality or fit tolerance will result in oil weeping, combustion leakage, and accelerated wear. The MOOSE OFFROAD Top End Gasket Kit delivers OEM-specification...09347199- SKU:
- 09347199
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$106.05 -
MOOSE OFFROAD Complete Gasket Kit - Yamaha 8080028MSE
MOOSE OFFROAD
$154.90A complete engine and transmission rebuild demands precision gaskets that won't fail under load—and OEM replacements come with OEM pricing. The MOOSE OFFROAD Complete Gasket Kit delivers durability and accuracy at a fraction of the cost, letting you...09347200- SKU:
- 09347200
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$154.90 -
MOOSE OFFROAD Complete Gasket Kit - Honda 8080040MSE
MOOSE OFFROAD
$86.16A complete engine and transmission rebuild demands precision-fit gaskets that won't compromise your reliability or budget. The MOOSE OFFROAD Complete Gasket Kit delivers OEM-quality sealing at a fraction of the cost, with every gasket and o-ring...09347201- SKU:
- 09347201
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$86.16 -
MOOSE OFFROAD Clutch Cylinder Guard - Gas Gas/Husqvarna/KTM 13-1021
MOOSE OFFROAD
$42.95Hydraulic clutch cylinders are vulnerable to impact damage and chain strikes—two of the most common causes of mid-race failures. This MOOSE OFFROAD guard protects your clutch cylinder with CNC-machined aluminum construction while integrated knockdown...09500988- SKU:
- 09500988
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
$42.95 -
MOOSE OFFROAD Slave Cylinder Rebuild Kit - Honda 18-6040
MOOSE OFFROAD
$29.95A leaking slave cylinder compromises both safety and clutch performance, leading to spongy engagement and potential hydraulic failure. This rebuild kit gives you a cost-effective alternative to full replacement, restoring your hydraulic system's...09500987- SKU:
- 09500987
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$29.95 -
MOOSE OFFROAD Exhaust Gasket Kit - Yamaha 823200MSE
MOOSE OFFROAD
$29.14Exhaust gaskets are critical wear items that deteriorate under thermal cycling and vibration, leading to exhaust leaks that compromise performance and increase emissions. The MOOSE OFFROAD Exhaust Gasket Kit delivers OEM-quality replacement gaskets and...09347189- SKU:
- 09347189
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$29.14 -
MOOSE OFFROAD Exhaust Gasket Kit - Yamaha 823201MSE
MOOSE OFFROAD
$15.81A compromised exhaust seal costs you power and reliability. This Moose Offroad gasket kit eliminates leaks at critical connection points, restoring the backpressure and flow characteristics your engine was designed for. Whether you're running stock or...09347190- SKU:
- 09347190
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$15.81 -
MOOSE OFFROAD Exhaust Gasket Kit - KTM 823195MSE
MOOSE OFFROAD
$16.37Exhaust gasket deterioration is one of the most common causes of performance loss and exhaust leaks on KTM 4-stroke engines. A failing gasket compromises seal integrity, allowing unburned fuel to escape and throwing off your air-fuel ratio—resulting in...09347191- SKU:
- 09347191
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$16.37
