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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On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900068
ATHENA
MSRP: $224.95Now: $202.00Was: $224.95A complete gasket failure can leave you stranded or cost thousands in engine damage. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing integrity across all critical surfaces, ensuring your Kawasaki P400 engine maintains compression and...09346355- SKU:
- 09346355
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $224.95Now: $202.00Was: $224.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270900088
ATHENA
MSRP: $205.95Now: $185.00Was: $205.95A complete gasket kit is essential for engine longevity and reliability—whether you're rebuilding after a major service or protecting against future failures. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across all critical engine...09346356- SKU:
- 09346356
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $205.95Now: $185.00Was: $205.95 -
ACERBIS X-Power Cover Kit - Black - Yamaha 2780680001
ACERBIS
$76.95Off-road riding exposes your engine to constant battering from rocks, mud, and debris—damage that compromises performance and shortens component lifespan. The ACERBIS X-Power Cover Kit shields your crankcase and clutch cover with molded plastic...09401893- SKU:
- 09401893
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- MODEL:
- X-POWER
- PRODUCT NAME:
- COVER
- TYPE:
- ENGINE
- MATERIAL:
- PLASTIC
- PRODUCT NAME:
- COVER KIT
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
ACERBIS X-Power Cover Kit - Black - Yamaha 2780690001
ACERBIS
$76.95Dirt, debris, and impact damage are constant threats to your engine's vulnerable crankcase and ignition covers during aggressive riding. The ACERBIS X-Power Cover Kit shields these critical components with molded, heat-resistant protection while...09401895- SKU:
- 09401895
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- PLASTIC
- TYPE:
- ENGINE
- MODEL:
- X-POWER
- PRODUCT NAME:
- COVER
- PRODUCT NAME:
- COVER KIT
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
ACERBIS X-Power Cover Kit - Blue - Yamaha 2780690211
ACERBIS
$76.95Protect your engine from the trail abuse that comes with serious riding. The ACERBIS X-Power Cover Kit shields your crankcase and ignition/clutch cover from dirt, debris, and impact damage while maintaining unrestricted access to critical service points...09401896- SKU:
- 09401896
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- MATERIAL:
- PLASTIC
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLUE
- MODEL:
- X-POWER
- PRODUCT NAME:
- COVER
- UNITS:
- KIT
- PRODUCT NAME:
- COVER KIT
- RIDING STYLE:
- OFF-ROAD
$76.95 -
ACERBIS X-Power Cover Kit - Black - Yamaha 2791690001
ACERBIS
$76.95Protecting your engine from track debris and impact damage isn't optional—it's essential for reliability and longevity. The ACERBIS X-Power Cover Kit shields your crankcase and ignition/clutch cover with durable, heat-resistant material that won't...09401897- SKU:
- 09401897
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- PRODUCT NAME:
- COVER KIT
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- X-POWER
- UNITS:
- KIT
- MATERIAL:
- PLASTIC
- TYPE:
- ENGINE
$76.95 -
ACERBIS X-Power Cover Kit - Black - KTM/Husqvarna 2709760001
ACERBIS
$76.95Dirt and debris are inevitable when pushing your KTM or Husqvarna to the limit, but unprotected engine cases aren't. The ACERBIS X-Power Cover Kit shields your crankcase and ignition/clutch cover from impact and contamination while maintaining stock...09401757- SKU:
- 09401757
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
ACERBIS X-Power Cover Kit - Orange - KTM/Husqvarna 2709760237
ACERBIS
$69.95Dirt, rocks, and debris are inevitable when pushing your KTM or Husqvarna to the limit—and unprotected engine covers pay the price. The ACERBIS X-Power Cover Kit shields your crankcase and clutch cover from impact and contamination while maintaining...09401759- SKU:
- 09401759
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- MATERIAL:
- PLASTIC
- MODEL:
- X-POWER
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- ORANGE
$69.95 -
JAGG OIL COOLERS Universal 10-Row Oil Cooler 3140
JAGG OIL COOLERS
$239.95Jagg Universal Oil Cooler Cores are the very same oil coolers that are used in high-quality Jagg kits, These units are perfect for the customizer, the fabricator, and the racer, Supplied as oil cooler only, Mounting hardware sold separately07130212- SKU:
- 07130212
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- MOUNTING POSITION:
- TOP
- PRODUCT NAME:
- OIL COOLER
- STYLE:
- 90°
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- MOUNTING STYLE:
- THREADED
- BASE COLOR:
- BLACK
- TYPE:
- 10-ROW
- UNITS:
- EACH
- BASE FINISH:
- POWDER-COATED
- RIDING STYLE:
- STREET
$239.95 -
JAGG OIL COOLERS Thermostat Service Kit AK4700-T
JAGG OIL COOLERS
$37.95Service kit to replace thermostat by-pass element in Jagg 4700 Offset Oil Filter Adapter07130216- SKU:
- 07130216
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- THERMOSTAT
- TYPE:
- OIL COOLER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$37.95 -
JAGG OIL COOLERS By-Pass Valve Service Kit SK4050-T
JAGG OIL COOLERS
$29.95Proper oil temperature management is critical for engine longevity and performance, especially in variable weather conditions. The JAGG SK4050-T by-pass valve gives you precise thermal control by allowing oil to bypass the cooler during cold starts or...07130219- SKU:
- 07130219
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BYPASS VALVE
- TYPE:
- AUTOMATIC
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$29.95 -
JAGG OIL COOLERS 180 Degree Preset Thermal Switch TS180
JAGG OIL COOLERS
$27.95This bi-metal disc type thermostat installs directly into any 1/8" NPT port and provides an automatic switch to turn on 12V electric fan at the set temperature07130220- SKU:
- 07130220
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- FAN SWITCH
- RIDING STYLE:
- STREET
- STYLE:
- 180°F
- TYPE:
- AUTOMATIC
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
$27.95 -
HOT RODS Seal Output Shaft OSK0010
HOT RODS
$27.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This HOT RODS complete kit eliminates guesswork by bundling everything you need to properly restore your seal in one purchase, saving...09350576- SKU:
- 09350576
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95 -
HOT RODS Seal Output Shaft OSK0033
HOT RODS
$8.95A leaking countershaft seal will compromise your transmission performance and lead to costly internal damage if left unaddressed. This complete kit eliminates the guesswork by bundling everything needed for a proper seal replacement in one package,...09350596- SKU:
- 09350596
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$8.95 -
HOT RODS Seal Output Shaft OSK0036
HOT RODS
$30.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. The HOT RODS Seal Output Shaft kit eliminates the guesswork by bundling everything you need for a complete repair in one...09350598- SKU:
- 09350598
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- UNITS:
- KIT
$30.95 -
HOT RODS Seal Output Shaft OSK0037
HOT RODS
$38.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This complete HOT RODS kit eliminates the guesswork by bundling everything needed for a proper repair in one purchase, saving you...09350599- SKU:
- 09350599
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$38.95 -
HOT RODS Seal Output Shaft OSK0054
HOT RODS
$39.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This complete kit from HOT RODS gives you everything needed to stop the leak and restore proper operation in one installation,...09350724- SKU:
- 09350724
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$39.95 -
HOT RODS Water Pump Repair Kit - Kawasaki WPK0030
HOT RODS
$39.95A leaking water pump doesn't just waste coolant—it puts your engine at risk of overheating and catastrophic failure. The HOT RODS Water Pump Repair Kit gives you OEM-quality replacement internals to restore pump integrity without the cost of a full...09345375- SKU:
- 09345375
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$39.95 -
HOT RODS Water Pump Repair Kit - KTM WPK0068
HOT RODS
$70.95A leaking water pump compromises engine cooling efficiency and can lead to catastrophic overheating—especially under racing conditions or extended high-load operation. The HOT RODS Water Pump Repair Kit (WPK0068) gives you OEM-equivalent precision...09345377- SKU:
- 09345377
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.95 -
HOT RODS Water Pump Shaft HRSHA-005
HOT RODS
$34.95A worn water pump shaft compromises cooling system efficiency and accelerates seal degradation, leading to costly leaks and potential engine damage. The HOT RODS Water Pump Shaft HRSHA-005 restores OE-spec performance with precision engineering and a...09500578- SKU:
- 09500578
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- OFF-ROAD
$34.95
