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!
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- Quantity
- Price
- Subtotal
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MOOSE RACING Valve Shim - 7.48 x 1.85 - 5 pack MSE5PK748185
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity—even a few thousandths of an inch off tolerance can cost you horsepower and reliability. The MOOSE RACING Valve Shim 7.48 x 1.85 (5-pack) gives you a complete,...09261871- SKU:
- 09261871
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- 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
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.85 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.40 - 5 pack MSE5PK748240
MOOSE RACING
$9.95Valve shim maintenance doesn't have to mean hunting through unmarked hardware. These MOOSE RACING shims eliminate guesswork with laser-etched sizing, so you can quickly identify the right spec and keep your valve train dialed in without wasting shop time...09261882- SKU:
- 09261882
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.45 - 5 pack MSE5PK748245
MOOSE RACING
$9.95Maintaining precise valve clearances is critical for consistent performance and engine longevity—and these MOOSE RACING shims give you the durability and accuracy to dial in your valve train without guesswork. Forged from 4140 cold rolled steel, each...09261883- SKU:
- 09261883
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.50 - 5 pack MSE5PK748250
MOOSE RACING
$9.95Maintaining proper valve clearance is critical to engine performance, reliability, and longevity—and having quality shims on hand ensures you can make adjustments without delays or compromises. MOOSE Racing valve shims are forged from 4140 cold rolled...09261884- SKU:
- 09261884
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- VALVE SHIM THICKNESS METRIC:
- 2.50 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- 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 Valve Shim - 8.90 x 1.82 - 5 pack MSE5PK890192
MOOSE RACING
$10.95Precision valve shim selection is critical to maintaining proper valve clearance and preventing costly engine damage. This 5-pack of forged 4140 steel shims gives you the exact sizing options needed for quick, accurate valve train adjustments without the...09261910- SKU:
- 09261910
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.92 MM
$10.95 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811427
MOOSE RACING
$92.89A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—OEM-quality components at a fraction of dealership pricing. This MOOSE RACING kit eliminates the frustration of sourcing individual seals and...M811427- SKU:
- M811427
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$92.89 -
MOOSE RACING Water Pump Rebuild Kit 821213
MOOSE RACING
$38.48A failing water pump can sideline your engine and compromise cooling system integrity—this MOOSE RACING rebuild kit gives you everything needed to restore your pump to OEM specifications without unnecessary downtime or expense. Rather than replacing the...09345179- SKU:
- 09345179
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$38.48 -
MOOSE RACING Water Pump Rebuild Kit 821233
MOOSE RACING
$53.09A failing water pump can compromise your entire cooling system, leaving you stranded trackside or worse. This MOOSE RACING rebuild kit supplies every gasket, seal, bearing, and O-ring needed to restore your water pump to OEM specifications—saving you the...09345181- SKU:
- 09345181
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$53.09 -
MOOSE RACING Water Pump Rebuild Kit 821243
MOOSE RACING
$52.37A failing water pump doesn't just reduce cooling efficiency—it can cause catastrophic engine damage in minutes. This MOOSE RACING rebuild kit gives you all the OEM-quality components needed to restore your water pump to factory specifications without...09345182- SKU:
- 09345182
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$52.37 -
MOOSE RACING Water Pump Rebuild Kit 821259
MOOSE RACING
$40.88A failing water pump can sideline your engine and compromise cooling system integrity—exactly what you can't afford during competition or demanding track sessions. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump to...09345184- SKU:
- 09345184
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$40.88 -
MOOSE RACING Motor Gasket Kit with Seal - KTM360/380 811307
MOOSE RACING
$92.89A complete engine and transmission rebuild demands gaskets and seals that fit precisely and last through countless heat cycles. The MOOSE RACING Motor Gasket Kit eliminates the frustration of sourcing individual components from multiple suppliers while...09340110- SKU:
- 09340110
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$92.89 -
MOOSE RACING Motor Seals - RM85 822176
MOOSE RACING
$30.56Engine rebuild projects demand reliability at every seal and gasket—compromised seals lead to oil leaks, contamination, and premature failure. The MOOSE RACING Motor Seals kit eliminates the guesswork by delivering OEM-equivalent components at a fraction...M822176- SKU:
- M822176
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$30.56 -
MOOSE RACING Motor Seals - CRF450 822178
MOOSE RACING
$59.71Engine and transmission seals are critical wear items that demand precision and reliability—especially when you're rebuilding or maintaining high-performance equipment. MOOSE RACING Motor Seals deliver OEM-quality fitment at a fraction of OEM pricing, so...M822178- SKU:
- M822178
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
$59.71 -
MOOSE RACING Complete Motor Gasket Kit - CR500 808273
MOOSE RACING
$81.27A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing individual components by bundling...M808273- SKU:
- M808273
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$81.27 -
MOOSE RACING Complete Motor Gasket Kit - XR600 808280
MOOSE RACING
$102.28A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or wallet. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of dealership pricing, letting you...M808280- SKU:
- M808280
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$102.28 -
MOOSE RACING Complete Motor Gasket Kit - KLR110/DRZ110 808415
MOOSE RACING
$71.55A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing individual components at premium OEM prices, giving you every...09340131- SKU:
- 09340131
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$71.55 -
MOOSE RACING Complete Motor Gasket Kit - KX/RM100 808411
MOOSE RACING
$62.78A complete engine rebuild demands precision gaskets and seals that won't compromise your motor's integrity or your wallet. This Moose Racing kit eliminates the guesswork of sourcing individual components, giving you every gasket and seal needed for...M808411- SKU:
- M808411
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$62.78 -
MOOSE RACING Ignition Cover Gasket 816058
MOOSE RACING
$11.65A compromised ignition cover gasket can lead to oil seepage, contamination, and potential engine damage—precisely why OEM-quality replacement is non-negotiable for serious builders. The MOOSE RACING 816058 delivers genuine sealing performance at a...09340570- SKU:
- 09340570
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- IGNITION COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$11.65 -
VESRAH Exhaust Valve GG-1013-EX
VESRAH
$23.33Exhaust valve performance directly impacts your engine's ability to expel combustion gases efficiently, which is critical for maintaining horsepower and thermal stability under sustained racing conditions. The VESRAH GG-1013-EX is precision-engineered to...09262805- SKU:
- 09262805
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER:
- 23,50 MM
- HEAD DIAMETER METRIC:
- 23.50 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 5.50 MM
- RIDING STYLE:
- STREET
- APPLICATION:
- EXHAUST
- LENGTH METRIC:
- 67.60 MM
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$23.33 -
VESRAH Exhaust Valve GG-1014-EX
VESRAH
$23.50A precision exhaust valve is critical to your engine's breathing efficiency—poor valve sealing directly impacts horsepower, fuel economy, and combustion reliability. The VESRAH GG-1014-EX delivers OEM-equivalent performance with the precision...GG1014EX- SKU:
- GG1014EX
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 5.50 MM
- APPLICATION:
- EXHAUST
- HEAD DIAMETER:
- 25,00 MM
- PRODUCT NAME:
- VALVE
- HEAD DIAMETER METRIC:
- 25.00 MM
- LENGTH METRIC:
- 91.50 MM
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$23.50
