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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- Qty in Cart
- Quantity
- Price
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MOOSE RACING Clutch Cover - Sherco D70-5440MB
MOOSE RACING
$169.95Your Sherco's clutch cover takes constant abuse from heat cycles and impact—OEM aluminum simply isn't engineered to handle sustained high-performance demands. This MOOSE Racing cover replaces it with aircraft-grade billet aluminum that's measurably...09402187- SKU:
- 09402187
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
$169.95 -
MOOSE RACING Clutch Cover - Yamaha D70-4427MB
MOOSE RACING
$220.95Your clutch cover endures extreme heat and mechanical stress on every ride—stock aluminum simply won't cut it if you're pushing performance. MOOSE Racing's aircraft-grade aluminum cover handles the demands of high-RPM riding with superior strength and...09402188- SKU:
- 09402188
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$220.95 -
MOOSE RACING Clutch Cover - Gas Gas/Husqvarna/KTM D70-5441MB
MOOSE RACING
$199.95A stock clutch cover can't handle the demands of aggressive riding or racing conditions—it warps under heat, fails prematurely, and compromises your bike's reliability when you need it most. The MOOSE RACING Clutch Cover replaces that weakness with...09402189- SKU:
- 09402189
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
$199.95 -
MOOSE RACING Ignition Cover - Husqvarna/KTM D70-5486MB
MOOSE RACING
$329.95Your ignition cover takes constant abuse from heat cycles, debris, and vibration—stock covers crack, warp, and fail at the worst possible moments. The MOOSE RACING Ignition Cover replaces that weak point with aircraft-grade aluminum that's engineered to...09402190- SKU:
- 09402190
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$329.95 -
MOOSE RACING Ignition Cover - Yamaha D70-4477MB
MOOSE RACING
$345.95Your ignition cover takes constant heat cycles and mechanical stress—stock Yamaha covers often crack or degrade under sustained performance use. The MOOSE RACING D70-4477MB replaces that vulnerability with aircraft-grade aluminum construction, delivering...09402191- SKU:
- 09402191
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$345.95 -
MOOSE RACING Ignition Cover - Yamaha D70-4476MB
MOOSE RACING
$172.95Your stock ignition cover is compromising both cooling efficiency and long-term durability. This MOOSE RACING billet aluminum replacement dissipates heat more effectively while delivering superior impact resistance—a critical upgrade for riders pushing...09402192- SKU:
- 09402192
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
$172.95 -
MOOSE RACING Ignition Cover - Husqvarna D70-5483MB
MOOSE RACING
$379.95Stock ignition covers are vulnerable to impact damage and heat degradation—especially in high-performance riding conditions. This MOOSE RACING ignition cover replaces that weak point with aircraft-grade aluminum construction that withstands the rigors of...09402193- SKU:
- 09402193
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$379.95 -
MOOSE RACING Oil Filter Cover - Husqvarna/KTM T14-5321GB
MOOSE RACING
$40.95Protect your engine's oil system from debris, mud, and trail damage with a purpose-built oil filter cover engineered for the demands of off-road riding. This MOOSE RACING cover shields your filter housing during aggressive terrain navigation while...09402194- SKU:
- 09402194
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
$40.95 -
MOOSE RACING Oil Filter Cover - Yamaha T14-4302GB
MOOSE RACING
$40.95An oil filter cover protects one of your engine's most critical components from impacts, debris, and damage during aggressive riding or racing conditions. Whether you're pushing hard on the track or tackling technical terrain, a quality cover prevents...09402195- SKU:
- 09402195
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
$40.95 -
MOOSE RACING Oil Filter Cover - KTM/Gas Gas T14-5312B
MOOSE RACING
$34.95The MOOSE RACING Oil Filter Cover delivers essential engine protection by shielding your oil filter from debris, mud, and impact damage during aggressive riding conditions. This bolt-on component prevents costly filter compromise and maintains consistent...09402196- SKU:
- 09402196
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$34.95 -
MOOSE RACING Water Pump Cover - Black - Yamaha I04-4251B
MOOSE RACING
$99.95Stock water pump covers are vulnerable to corrosion and impact damage, leaving your cooling system exposed to premature failure. The MOOSE RACING billet aluminum cover replaces that weak OEM casting with aerospace-grade durability while maintaining a...09402197- SKU:
- 09402197
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
$99.95 -
MOOSE RACING Water Pump Cover - Black - KTM/Gas Gas/Husqvarna I04-5262B
MOOSE RACING
$79.95Stock water pump covers on KTM, Gas Gas, and Husqvarna dirt bikes are vulnerable to impact damage and corrosion—compromising your cooling system's reliability when it matters most. The MOOSE RACING billet aluminum cover delivers the durability of factory...09402198- SKU:
- 09402198
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$79.95 -
MOOSE RACING Oil Filter Plug - Beta T14-5311R
MOOSE RACING
$28.95A quality oil filter plug is essential for maintaining proper oil system integrity and preventing leaks that compromise engine performance. The MOOSE RACING Oil Filter Plug for Beta delivers OEM-equivalent reliability with precision engineering, ensuring...09501033- SKU:
- 09501033
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$28.95 -
VERTEX Top End Piston Kit - 71.925 mm - Gas Gas | Husqvarna | KTM VTK24244A-1
VERTEX
$336.95When your two-stroke top end reaches the end of its service life, a quality piston kit is the foundation of reliable performance and longevity. The VERTEX Top End Piston Kit delivers OEM-equivalent quality with factory-grade durability, ensuring...09106818- SKU:
- 09106818
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$336.95 -
VERTEX Top End Piston Kit - 71.935 mm - Gas Gas | Husqvarna | KTM VTK24244B-1
VERTEX
$336.95When your top end wears out, you need a piston kit that matches OE specifications without compromise. The VERTEX VTK24244B-1 delivers reliable performance with factory-equivalent geometry and a Molybdenum Disulphite-coated skirt that reduces friction...09106819- SKU:
- 09106819
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$336.95 -
VERTEX Top End Piston Kit - 71.945 mm - Gas Gas | Husqvarna | KTM VTK24244C-1
VERTEX
$336.95A properly functioning top end is critical to maintaining peak engine performance and reliability in your two-stroke. The VERTEX Top End Piston Kit delivers OEM-quality construction with factory-standard fitment for Gas Gas, Husqvarna, and KTM platforms,...09106820- SKU:
- 09106820
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
$336.95Qty in Cart: 0Quantity:Price:$336.95Subtotal: -
VERTEX Top End Piston Kit - 66.34 mm - Gas Gas | Husqvarna | KTM VTK23630A-3
VERTEX
$307.95When your top end is worn, you need a piston kit that restores OE reliability without compromise. The VERTEX VTK23630A-3 delivers factory-spec performance with enhanced durability features—ideal for riders who demand dependable power delivery across the...09106821- SKU:
- 09106821
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
COMETIC Top End Gasket/O-Ring Cylinder Head Gasket Kit - Yamaha C3694
COMETIC
$39.95A worn or damaged cylinder head gasket compromises combustion sealing, leading to loss of compression, coolant leaks, and potential engine damage. The COMETIC C3694 Top End Gasket/O-Ring Kit supplies all OEM-equivalent sealing components needed for a...09351299- SKU:
- 09351299
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
COMETIC Top End Gasket Kit - 68 mm - Honda C3171-EST
COMETIC
$63.95A quality top end gasket kit is non-negotiable if you're serious about engine reliability and peak performance. Cometic's EST gasket technology delivers superior sealing on high-boost and naturally aspirated engines by distributing combustion pressure...09347824- SKU:
- 09347824
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$63.95 -
COMETIC Top End Gasket Kit - Yamaha C3215
COMETIC
$44.95A top end gasket kit is critical insurance for any engine rebuild or refresh—even one failed seal can lead to compression loss, coolant leaks, and catastrophic engine damage. The COMETIC C3215 uses multi-layered steel construction with Viton rubber...09347826- SKU:
- 09347826
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal:
