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 Washer/Snap Ring Counter Shaft 25-6008
MOOSE RACING
$21.95Front sprocket replacements demand precision hardware—and overlooking the countershaft lock-washers and snap rings is a costly mistake that can lead to sprocket creep, misalignment, and accelerated wear. The MOOSE RACING Washer/Snap Ring Counter Shaft...09350490- SKU:
- 09350490
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 10 PACK
- PRODUCT NAME:
- SNAP RING
- RIDING STYLE:
- STREET
$21.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4043
MOOSE RACING
$29.95A worn countershaft sprocket seal is a direct path to transmission fluid contamination and premature drivetrain wear. This MOOSE RACING kit delivers OEM-quality sealing with hardened steel components engineered to withstand the demands of high-RPM riding...09350845- SKU:
- 09350845
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4045
MOOSE RACING
$27.95A worn countershaft sprocket seal compromises transmission integrity and allows contamination into critical drivetrain components. This MOOSE RACING kit delivers OEM-quality sealing with upgraded materials, ensuring reliable power delivery and extended...09350847- SKU:
- 09350847
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1002
MOOSE RACING
$76.95A worn or damaged crankshaft bearing assembly compromises engine reliability and performance—especially critical in 2-stroke applications where precision tolerances are non-negotiable. The MOOSE RACING 24-1002 kit delivers OEM-quality bearings with...A241002- SKU:
- A241002
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1004
MOOSE RACING
$85.95A healthy crankshaft is the foundation of engine reliability, and worn bearings or compromised seals will cost you performance and uptime. The MOOSE RACING 24-1004 Crankcase Bearing and Seal Kit delivers precision-engineered components that restore...A241004- SKU:
- A241004
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$85.95 -
MOOSE RACING Crank Bearing with Seals - KDX 24-1045
MOOSE RACING
$85.95A worn or damaged crankshaft bearing will compromise engine reliability and performance, leading to costly downtime and potential catastrophic failure in 2-stroke applications. The MOOSE RACING Crank Bearing Kit ensures precise fitment and smooth...A241045- SKU:
- A241045
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- UNITS:
- KIT
- TYPE:
- BALL
$85.95 -
MOOSE RACING Water Pump Rebuild Kit 821440
MOOSE RACING
$47.41A failing water pump can sideline your engine faster than you'd expect, leaving you stranded mid-season or mid-race. This complete MOOSE RACING rebuild kit gives you every gasket, seal, bearing, and snap ring needed to restore your water pump to factory...09345220- SKU:
- 09345220
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$47.41 -
MOOSE RACING Water Pump Rebuild Kit 821483
MOOSE RACING
$33.18A failing water pump can quickly escalate into catastrophic engine damage, making preventative maintenance non-negotiable for serious racers and performance enthusiasts. The MOOSE RACING Water Pump Rebuild Kit 821483 gives you a complete seal, gasket,...09345233- SKU:
- 09345233
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$33.18 -
MOOSE RACING Water Pump Rebuild Kit 821485
MOOSE RACING
$58.97A failing water pump can compromise your entire cooling system, leading to catastrophic engine damage and costly downtime. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to OEM specifications without the expense of a...09345234- SKU:
- 09345234
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$58.97 -
MOOSE RACING Water Pump Rebuild Kit 821581
MOOSE RACING
$54.07A failed water pump doesn't just leave you stranded—it can cause catastrophic engine damage in minutes. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to OEM specifications without the cost of a complete replacement...09345244- SKU:
- 09345244
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$54.07 -
MOOSE RACING Water Pump Rebuild Kit 821614
MOOSE RACING
$42.36A failing water pump doesn't just risk overheating—it can strand you trackside or worse. The MOOSE RACING Water Pump Rebuild Kit 821614 gives you a complete set of OEM-quality replacement components to restore your pump to factory specification without...09345252- SKU:
- 09345252
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$42.36 -
MOOSE RACING Water Pump Rebuild Kit 821670
MOOSE RACING
$40.11A failing water pump can leave you stranded mid-season and compromise your engine's thermal stability when you need it most. This MOOSE RACING rebuild kit delivers all the OEM-grade components needed to restore your water pump to factory specification...09345260- SKU:
- 09345260
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$40.11 -
MOOSE RACING Exhaust Gasket Kit 823120
MOOSE RACING
$16.37A compromised exhaust gasket leads to performance loss, exhaust leaks, and potential engine damage—issues that compound quickly on high-performance builds. The MOOSE RACING Exhaust Gasket Kit 823120 delivers OEM-grade sealing with the durability required...09345319- SKU:
- 09345319
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
$16.37 -
MOOSE RACING Exhaust Gasket Kit 823142
MOOSE RACING
$21.48A quality exhaust gasket kit is essential for maintaining a proper seal between exhaust manifold and header components, preventing dangerous exhaust leaks that compromise both performance and safety. Factory gaskets deteriorate under extreme heat cycles,...09345324- SKU:
- 09345324
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823143
MOOSE RACING
$21.87Exhaust system integrity directly impacts engine performance and longevity. A compromised gasket seal allows unburned gases to escape before the exhaust reaches your catalytic converter and muffler, robbing you of power and creating dangerous leaks. The...09345325- SKU:
- 09345325
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823151
MOOSE RACING
$21.87A leaking exhaust manifold gasket will rob your engine of power, increase emissions, and create persistent noise that signals trouble to anyone within earshot. MOOSE RACING's Exhaust Gasket Kit 823151 delivers OEM-quality sealing performance with...09345333- SKU:
- 09345333
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823154
MOOSE RACING
$21.87Exhaust gasket failure is one of the most common causes of performance loss and reliability issues in high-revving engines. A degraded or blown gasket allows exhaust gases to escape before reaching your header or manifold, robbing you of power while...09345335- SKU:
- 09345335
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823156
MOOSE RACING
$13.64A proper exhaust seal is fundamental to engine performance and longevity. Worn or damaged gaskets cause exhaust leaks that rob horsepower, increase emissions, and allow unburned fuel to escape. The MOOSE RACING Exhaust Gasket Kit 823156 delivers...09345337- SKU:
- 09345337
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$13.64 -
MOOSE RACING Exhaust Gasket Kit 823158
MOOSE RACING
$21.87A leaking exhaust gasket compromises both performance and reliability, allowing unmetered gases to escape and creating diagnostic headaches. MOOSE RACING's Exhaust Gasket Kit 823158 delivers OEM-quality sealing with the durability to handle sustained...09345339- SKU:
- 09345339
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823159
MOOSE RACING
$21.87A leaking exhaust gasket compromises engine sealing, increases emissions, and wastes horsepower—problems that cascade into costly engine damage if left unchecked. The MOOSE RACING Exhaust Gasket Kit 823159 delivers OEM-quality sealing with premium...09345340- SKU:
- 09345340
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$21.87
