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 Ignition Cover Gasket 816287
MOOSE RACING
$14.99A properly sealed ignition cover is critical to engine reliability—combustion heat and vibration will degrade a worn gasket, leading to oil seepage and potential ignition system failures. The MOOSE Racing Ignition Cover Gasket ensures a consistent,...09346142- SKU:
- 09346142
- 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
$14.99 -
MOOSE RACING Water Pump Rebuild Kit 8210030
MOOSE RACING
$59.00A failing water pump compromises your engine's cooling system and can lead to catastrophic overheating during high-performance driving. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and snap ring needed to restore your water pump to...09346543- SKU:
- 09346543
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$59.00 -
MOOSE RACING Motor Seals - TTR125 822240
MOOSE RACING
$27.13Engine seal degradation is one of the most common causes of oil leaks and internal wear in the TTR125. Rather than pay OEM prices for a complete gasket and seal kit, the MOOSE RACING Motor Seals deliver genuine OEM-equivalent performance at a fraction of...09350042- SKU:
- 09350042
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$27.13 -
MOOSE RACING Motor Seals - YZ125 822252
MOOSE RACING
$42.00Engine seals are critical wear items that directly impact compression, oil retention, and overall engine longevity. OEM replacement seals can strain your budget, but MOOSE Racing Motor Seals deliver genuine OEM-equivalent performance at a fraction of the...09350043- SKU:
- 09350043
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
$42.00 -
MOOSE RACING Motor Seals - KX250 822288
MOOSE RACING
$36.85Engine seals are critical wear items that directly impact oil containment, pressure retention, and longevity of your rebuild. OEM seals often carry premium pricing that doesn't match their performance—MOOSE Racing Motor Seals deliver genuine...09350052- SKU:
- 09350052
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SEAL
$36.85 -
MOOSE RACING Connecting Rod MR6102
MOOSE RACING
$474.95Stock connecting rods are a bottleneck in high-output engine builds—they flex under load, add unnecessary weight, and limit your engine's ability to respond to throttle input. The MOOSE RACING MR6102 Connecting Rod, developed in partnership with...09230314- SKU:
- 09230314
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- MATERIAL:
- PROPRIETARY ALLOY
- PRODUCT NAME:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- HIGH PERFORMANCE
- UNITS:
- EACH
$474.95 -
MOOSE RACING Connecting Rod MR12063
MOOSE RACING
$474.95A connecting rod is only as strong as its weakest point—and stock rods are engineered for reliability, not performance. The MOOSE RACING MR12063, co-developed with CP-Carrillo, delivers the precision metallurgy and lightweight construction that separates...09230510- SKU:
- 09230510
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- UNITS:
- EACH
- MATERIAL:
- PROPRIETARY ALLOY
- PRODUCT NAME:
- CONNECTING ROD
- STYLE:
- HIGH PERFORMANCE
- RIDING STYLE:
- OFF-ROAD
$474.95 -
MOOSE RACING Valve Shim - 7.48 x 1.40 - 5 pack MSE5PK748140
MOOSE RACING
$9.95Proper valve train geometry is critical for peak engine performance, and maintaining precise valve clearances requires reliable, durable shims. MOOSE Racing valve shims are forged from 4140 cold rolled steel—not sintered—ensuring superior durability and...09261862- SKU:
- 09261862
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.40 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.45 - 5 pack MSE5PK748145
MOOSE RACING
$9.95Proper valve clearance is critical to engine performance, fuel efficiency, and longevity—and maintaining it requires reliable shims that won't degrade under thermal cycling. MOOSE RACING valve shims are forged from 4140 cold-rolled steel, delivering the...09261863- SKU:
- 09261863
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.45 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.50 - 5 pack MSE5PK748150
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity, and these MOOSE RACING valve shims give you the durability and accuracy needed for reliable valve train adjustment. Forged from 4140 cold-rolled steel rather than...09261864- SKU:
- 09261864
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.50 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.55 - 5 pack MSE5PK748155
MOOSE RACING
$9.95Valve shim maintenance is critical to maintaining proper valve clearances and engine performance, and having the correct sizes on hand eliminates guesswork during setup or adjustment. MOOSE Racing's 7.48 x 1.55 shims are forged from 4140 cold rolled...09261865- SKU:
- 09261865
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.55 MM
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.60 - 5 pack MSE5PK748160
MOOSE RACING
$9.95Maintaining proper valve clearances is critical to engine performance and longevity, and having quality shims on hand ensures you can make precise adjustments without delays. MOOSE RACING valve shims are forged from 4140 cold rolled steel—a material that...09261866- SKU:
- 09261866
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.60 MM
- RIDING STYLE:
- SNOW
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Water Pump Rebuild Kit 821262
MOOSE RACING
$36.89A failing water pump can leave you stranded on the track or road, compromising engine cooling and reliability. This MOOSE RACING rebuild kit delivers all the critical seals, gaskets, and bearings needed to restore your water pump to OEM...09345185- SKU:
- 09345185
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$36.89 -
VESRAH Exhaust Gasket VE-1012
VESRAH
$44.86A leaking exhaust gasket compromises both performance and emissions control, forcing your engine to work harder while wasting power. VESRAH's VE-1012 gaskets deliver a reliable seal that prevents exhaust bypass and maintains optimal back-pressure for...VX1012- SKU:
- VX1012
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
$44.86 -
VESRAH Exhaust Gasket VE-2004
VESRAH
$42.78A compromised exhaust gasket is an often-overlooked source of performance loss and unwanted noise. The VESRAH VE-2004 delivers a reliable, OEM-quality seal that prevents exhaust leaks, maintains proper scavenging efficiency, and eliminates the metallic...VX2004- SKU:
- VX2004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- 10 PACK
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
$42.78 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4028
MOOSE RACING
$23.95A worn countershaft sprocket seal is a silent performance killer—it allows critical oil to leak into your transmission cavity, compromising lubrication and accelerating wear on your drivetrain. The MOOSE RACING Countershaft Sprocket Seal Kit delivers a...09350453- SKU:
- 09350453
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$23.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4029
MOOSE RACING
$24.95Countershaft seals are critical wear items that prevent transmission fluid from leaking into the engine case—a failure that can contaminate your oil and compromise engine performance. The MOOSE RACING 25-4029 kit replaces all essential sealing components...09350454- SKU:
- 09350454
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$24.95 -
MOOSE RACING Exhaust Gasket Kit 823094
MOOSE RACING
$8.13A quality exhaust gasket kit is essential for maintaining a sealed exhaust system and preventing power-robbing leaks that compromise performance and create annoying rattles. The MOOSE RACING 823094 provides OEM-grade sealing across critical exhaust...09345295- SKU:
- 09345295
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- EXHAUST
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$8.13 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810372
MOOSE RACING
$81.70A top-end rebuild demands precision and reliability—MOOSE RACING gasket kits deliver both at a fraction of OEM pricing. Each set is engineered with high-tech materials to withstand engine stress while maintaining exact fitment, ensuring your rebuild...09345361- SKU:
- 09345361
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$81.70 -
MOOSE RACING Top End Gasket Kit - Husqvarna/KTM 810373
MOOSE RACING
$70.36A top-end rebuild demands precision gaskets and seals that won't compromise your engine's 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 compression and...09345362- SKU:
- 09345362
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.36
