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 Gasket 816346
MOOSE RACING
$14.45A leaking clutch cover gasket compromises engine sealing and can lead to oil loss during hard racing or spirited driving. The MOOSE RACING Clutch Cover Gasket 816346 delivers OEM-equivalent performance at a fraction of OEM pricing, using high-tech...09346589- SKU:
- 09346589
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$14.45 -
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 - KTM 822274
MOOSE RACING
$44.10Engine seal failure can compromise compression, cause oil leakage, and lead to costly internal damage. MOOSE RACING Motor Seals deliver OEM-equivalent performance at a fraction of the cost, allowing you to rebuild with confidence knowing every critical...09350045- SKU:
- 09350045
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
$44.10Qty in Cart: 0Quantity:Price:$44.10Subtotal: -
MOOSE RACING Motor Seals - KX/KDX 250 822287
MOOSE RACING
$33.18Engine seal degradation compromises compression, leaks oil, and accelerates internal wear—exactly what you can't afford when reliability matters. MOOSE RACING Motor Seals deliver OEM-equivalent fitment and durability at a fraction of OEM pricing, letting...09350051- SKU:
- 09350051
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
$33.18 -
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 Gasket Clutch Inner - Kawasaki 816090
MOOSE RACING
$13.64A worn or compromised clutch gasket leads to fluid leakage, loss of clutch engagement, and potential engine damage—all of which sideline your bike at the worst times. The MOOSE RACING Gasket Clutch Inner is engineered to OEM specifications, delivering a...09346892- SKU:
- 09346892
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH INNER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$13.64Qty in Cart: 0Quantity:Price:$13.64Subtotal: -
MOOSE RACING Gasket Clutch Inner - Kawasaki 816197
MOOSE RACING
$27.84A worn or damaged clutch gasket compromises your clutch system's seal integrity, leading to fluid leakage and unpredictable engagement. The MOOSE RACING Gasket Clutch Inner is engineered to OEM specifications for your Kawasaki, ensuring proper pressure...09346893- SKU:
- 09346893
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH INNER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$27.84 -
MOOSE RACING Connecting Rod MR5497
MOOSE RACING
$474.95If you're building or rebuilding a high-performance engine, your connecting rod is the critical link between combustion force and crankshaft rotation—it has to handle extreme stress without compromise. The MOOSE RACING Connecting Rod MR5497, developed in...09230311- SKU:
- 09230311
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- MATERIAL:
- PROPRIETARY ALLOY
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CONNECTING ROD
- STYLE:
- HIGH PERFORMANCE
- UNITS:
- EACH
$474.95 -
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
