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 Piston Ring - For 66.34/66.35 mm Piston MSE55910006640
MOOSE RACING
$32.95A worn or damaged piston ring directly compromises compression, oil control, and power output—making ring replacement one of the most critical maintenance tasks for any high-performance engine. MOOSE Racing piston rings are engineered to OEM...09120414- SKU:
- 09120414
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- EACH
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
MOOSE RACING Case Saver - RM125/250 03-161
MOOSE RACING
$23.95Engine case damage can sideline your bike faster than a DNF, and OEM plastic guards simply don't cut it on the track or trail. The MOOSE RACING Case Saver replaces flimsy stock protection with CNC-machined 6061 aluminum that absorbs impacts without...09500025- SKU:
- 09500025
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE COLOR:
- SILVER
- MATERIAL:
- 6061 ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$23.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6013
MOOSE RACING
$33.95Countershaft fasteners are wear items that should be replaced during any front sprocket service to ensure proper retention and prevent catastrophic drivetrain failure. The MOOSE RACING Washer/Snap Ring Counter Shaft 25-6013 delivers OEM-equivalent...09350493- SKU:
- 09350493
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 10 PACK
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SNAP RING
$33.95 -
MOOSE RACING Ignition Cover Gasket 816288
MOOSE RACING
$13.64A failing ignition cover gasket compromises engine sealing and invites oil leakage that can damage ignition components and degrade performance. The MOOSE RACING 816288 delivers OEM-grade reliability with a precision fit designed to maintain a watertight...09346143- SKU:
- 09346143
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$13.64 -
MOOSE RACING Water Pump Rebuild Kit 821364
MOOSE RACING
$35.25A failing water pump compromises engine cooling and risks catastrophic overheating—especially critical during high-performance racing or extended track sessions. The MOOSE RACING Water Pump Rebuild Kit 821364 gives you a complete, cost-effective solution...09345208- SKU:
- 09345208
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$35.25 -
MOOSE RACING Water Pump Rebuild Kit 821661
MOOSE RACING
$55.05A failing water pump can leave you stranded—or worse, destroy your engine. This MOOSE RACING rebuild kit gives you everything needed to restore your pump to factory specifications without the cost of a complete replacement. Whether you're prepping for...09345257- SKU:
- 09345257
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$55.05 -
MOOSE RACING Water Pump Rebuild Kit 821665
MOOSE RACING
$45.68A failing water pump compromises your entire cooling system, risking catastrophic engine damage during high-performance driving. The MOOSE RACING Water Pump Rebuild Kit 821665 restores your pump to OEM specifications with factory-quality seals, bearings,...09345258- SKU:
- 09345258
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$45.68 -
MOOSE RACING Water Pump Rebuild Kit 821264
MOOSE RACING
$37.45A failing water pump can sideline your engine before race day—corrosion, seal degradation, and bearing wear compromise cooling efficiency and create catastrophic failure risk. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap...09345186- SKU:
- 09345186
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$37.45 -
MOOSE RACING Water Pump Rebuild Kit 821273
MOOSE RACING
$48.77A failing water pump compromises your entire cooling system, risking catastrophic engine damage and costly downtime. The MOOSE RACING Water Pump Rebuild Kit 821273 delivers all the OEM-quality seals, bearings, and gaskets needed to restore your pump to...09345187- SKU:
- 09345187
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$48.77 -
MOOSE RACING Complete Motor Gasket Kit - CR500 808272
MOOSE RACING
$62.78A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. This MOOSE RACING kit eliminates the frustration of sourcing individual components and potential fitment issues by bundling everything you...09340137- SKU:
- 09340137
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$62.78 -
MOOSE RACING Top End Gasket Kit - 250SXF 810328
MOOSE RACING
$80.32A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the price, letting you restore your 250SXF's...09341009- SKU:
- 09341009
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
$80.32 -
MOOSE RACING Top End Gasket Kit - 125SX 810330
MOOSE RACING
$48.71A top-end rebuild demands precision components that won't compromise reliability or performance. The MOOSE RACING Gasket Kit eliminates the guesswork and expense of sourcing individual seals, gaskets, and O-rings—delivering a complete, engineered...09341267- SKU:
- 09341267
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$48.71 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1026
MOOSE RACING
$85.95A quality crankcase bearing and seal kit is non-negotiable for reliable engine performance, whether you're rebuilding after hard racing or performing preventive maintenance. The MOOSE RACING 24-1026 delivers precision-engineered bearings that maintain...A241026- SKU:
- A241026
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- CRANK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- BEARING KIT
$85.95 -
MOOSE RACING Inner Clutch Cover Gasket 816271
MOOSE RACING
$13.64A leaking clutch cover gasket compromises oil containment and engine reliability—exactly why OEM-quality sealing matters on your rebuild. The MOOSE RACING Inner Clutch Cover Gasket delivers genuine OEM-level performance at a fraction of OEM pricing,...09346135- SKU:
- 09346135
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$13.64 -
MOOSE RACING Inner Clutch Gasket 816300
MOOSE RACING
$33.38A leaking clutch gasket compromises both engine performance and reliability, leaving oil seepage that can damage adjacent components. The MOOSE RACING Inner Clutch Gasket 816300 delivers OEM-equivalent sealing with precision engineering and domestic...09346148- SKU:
- 09346148
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- RIDING STYLE:
- STREET
$33.38 -
MOOSE RACING Valve Shim - 7.48 x 2.05 - 5 pack MSE5PK748205
MOOSE RACING
$9.95Valve shim maintenance is critical to precision engine tuning, and having a complete refill kit on hand eliminates downtime during valve train adjustments. These forged 4140 shims deliver consistent thickness tolerances that directly impact valve...09261875- SKU:
- 09261875
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.05 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.10 - 5 pack MSE5PK748210
MOOSE RACING
$9.95Precision valve train maintenance demands reliable, durable shims that won't compromise your engine's calibration. These MOOSE RACING shims are forged from 4140 cold-rolled steel—not sintered—giving you superior strength and consistency across multiple...09261876- SKU:
- 09261876
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
$9.95 -
MOOSE RACING Inner Clutch Cover Gasket 816759
MOOSE RACING
$16.37A failing clutch cover gasket will compromise your engine's oil containment and leave you stranded. The MOOSE RACING Inner Clutch Cover Gasket 816759 delivers OEM-specification sealing without the premium OEM price tag, allowing you to rebuild with...09346171- SKU:
- 09346171
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$16.37 -
MOOSE RACING Outer Clutch Cover Gasket 817976
MOOSE RACING
$7.44A leaking clutch cover gasket compromises engine sealing and can lead to oil loss, contamination, and costly engine damage. The MOOSE RACING Outer Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using...09346183- SKU:
- 09346183
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$7.44Qty in Cart: 0Quantity:Price:$7.44Subtotal: -
MOOSE RACING Ignition Cover Gasket 816222
MOOSE RACING
$17.79A leaking ignition cover gasket compromises engine sealing and can lead to oil seepage that damages surrounding components. The MOOSE RACING Ignition Cover Gasket (816222) delivers OEM-grade durability at a fraction of OEM pricing, ensuring a reliable...09346898- SKU:
- 09346898
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$17.79
