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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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...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...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...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...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...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...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...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...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...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...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...09402197- SKU:
- 09402197
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
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...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...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...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...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...09106820- SKU:
- 09106820
- Availability:
- Ships Same Business Day
- Weight:
- 1.34 LBS
$336.95 -
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...09106821- SKU:
- 09106821
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95 -
On Sale
COMETIC Top End Gasket/O-Ring Cylinder Head Gasket Kit - Yamaha C3694
COMETIC
MSRP: $39.95Now: $35.96Was: $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...09351299- SKU:
- 09351299
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
COMETIC Top End Gasket Kit - 68 mm - Honda C3171-EST
COMETIC
MSRP: $63.95Now: $57.56Was: $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...09347824- SKU:
- 09347824
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $63.95Now: $57.56Was: $63.95 -
On Sale
COMETIC Top End Gasket Kit - Yamaha C3215
COMETIC
MSRP: $44.95Now: $40.46Was: $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...09347826- SKU:
- 09347826
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $44.95Now: $40.46Was: $44.95
