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 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...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...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...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...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...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...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...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...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...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...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...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...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...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
$102.28Qty in Cart: 0Quantity:Price:$102.28Subtotal: -
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...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...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...09340570- SKU:
- 09340570
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- IGNITION COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$11.65Qty in Cart: 0Quantity:Price:$11.65Subtotal: -
On Sale
VESRAH Exhaust Valve GG-1013-EX
VESRAH
MSRP: $23.33Now: $22.16Was: $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...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
MSRP: $23.33Now: $22.16Was: $23.33 -
On Sale
VESRAH Exhaust Valve GG-1014-EX
VESRAH
MSRP: $23.50Now: $22.33Was: $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...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
MSRP: $23.50Now: $22.33Was: $23.50 -
On Sale
VESRAH Complete Gasket Kit - Z50 R VG-1006
VESRAH
MSRP: $47.95Now: $45.55Was: $47.95A complete engine rebuild demands precision sealing at every junction—and this VESRAH gasket kit eliminates the guesswork by including every gasket, o-ring, and valve guide oil seal you need for a...VG1006- SKU:
- VG1006
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
MSRP: $47.95Now: $45.55Was: $47.95 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-825-14
WSM
$250.31A top-end rebuild is critical maintenance for high-performance engines operating at sustained RPMs and boost levels—this kit delivers OEM-quality components engineered to restore compression, reduce...01082514- SKU:
- 01082514
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
$250.31Qty in Cart: 0Quantity:Price:$250.31Subtotal:
