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 Motor Gasket Kit with Seal - CR125R 811244
MOOSE RACING
$120.99A complete engine and transmission rebuild demands precision-engineered gaskets and seals that won't compromise your work or your wallet. MOOSE Racing delivers OEM-equivalent quality at a fraction of dealership pricing, so you can confidently reassemble...09340456- SKU:
- 09340456
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$120.99 -
MOOSE RACING Top End Gasket Kit - SX/EXC/XL 810324
MOOSE RACING
$27.97A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. MOOSE RACING delivers OEM-equivalent performance at a fraction of OEM pricing, with every gasket, O-ring, and seal engineered for accurate...09340474- SKU:
- 09340474
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$27.97 -
VESRAH Intake Valve GG-1013-IN
VESRAH
$14.67Valve degradation is one of the most insidious causes of power loss and combustion inefficiency—and a worn intake valve can compromise your entire engine's performance. The VESRAH Intake Valve GG-1013-IN is precision-manufactured to OEM specifications,...09262804- SKU:
- 09262804
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 5.50 MM
- RIDING STYLE:
- STREET
- HEAD DIAMETER:
- 28,50 MM
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 28.50 MM
- LENGTH METRIC:
- 68.00 MM
- PRODUCT NAME:
- VALVE
$14.67 -
VESRAH Exhaust Gasket VE-1001
VESRAH
$11.95A reliable exhaust gasket is critical to maintaining a proper seal between your exhaust manifold and exhaust pipe—any leak will compromise both performance and emissions. The VESRAH VE-1001 delivers consistent sealing across thermal cycles, preventing...VX1001- SKU:
- VX1001
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 10 PACK
- TYPE:
- EXHAUST
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$11.95 -
VESRAH Complete Gasket Kit - KDX200 VG-471
VESRAH
$46.33A complete engine rebuild demands precision and reliability at every seal and gasket interface—this VESRAH kit eliminates the guesswork by bundling all necessary components into one OEM-quality package. Whether you're refreshing a tired top-end or going...VG471- SKU:
- VG471
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- SET
$46.33 -
On Sale
VESRAH Complete Gasket Kit - KX250 VG-487
VESRAH
MSRP: $40.95Now: $29.00Was: $40.95Engine rebuilds demand precision gaskets that seal properly under extreme combustion pressures—factory tolerances leave no room for leakage or blow-by. The VESRAH Complete Gasket Kit VG-487 supplies every gasket, o-ring, and valve guide oil seal needed...VG487- SKU:
- VG487
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $40.95Now: $29.00Was: $40.95 -
VESRAH Complete Gasket Kit - KDX80 VG-489
VESRAH
$32.97A complete engine rebuild demands precision—gasket failure is one of the fastest ways to lose compression, leak fluids, and compromise engine integrity. The VESRAH Complete Gasket Kit (VG-489) supplies every seal, o-ring, and gasket your KDX80 needs for...VG489- SKU:
- VG489
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- SET
$32.97 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-840-12
WSM
$339.74A complete top-end rebuild demands precision components that restore your engine to factory specifications or better. This WSM Original Series kit eliminates the guesswork by bundling every critical component needed for a professional-grade piston...01084012- SKU:
- 01084012
- Availability:
- Ships Same Business Day
- Weight:
- 4.05 LBS
- RIDING STYLE:
- WATERCRAFT
- PISTON SIZE METRIC:
- +0.50 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 73.50 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$339.74 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-840-14
WSM
$339.74A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained RPM cycles. The WSM Original Series kit delivers OEM-quality pistons paired with premium racing bearings and complete gasket sets, eliminating...01084014- SKU:
- 01084014
- Availability:
- Ships Same Business Day
- Weight:
- 4.40 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 74.00 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$339.74 -
WSM Piston Kit - K1200 - Standard 010-841PK
WSM
$98.28Stock pistons wear down, lose compression, and rob your engine of power and efficiency. The WSM Piston Kit K1200 restores your engine to peak performance with OEM-matching quality and engineering refinements that factory units simply don't offer. The...010841P- SKU:
- 010841P
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 80.00 MM
$98.28 -
WSM Piston Rings 010-902
WSM
$24.97Piston rings are a critical wear item that directly impacts compression, blow-by control, and oil consumption in any high-performance engine. WSM Piston Rings 010-902 deliver OEM-equivalent or superior sealing geometry, ensuring consistent ring gap and...010902- SKU:
- 010902
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
$24.97 -
WSM Piston Rings 010-910
WSM
$24.76Piston rings are critical wear items that directly impact compression, blow-by control, and oil consumption—neglecting them costs you power and reliability. WSM Piston Rings 010-910 deliver OEM-equivalent performance with tight tolerances and premium...010910- SKU:
- 010910
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$24.76Qty in Cart: 0Quantity:Price:$24.76Subtotal: -
WSM Piston Rings 010-915-05
WSM
$42.46Piston rings are critical to engine efficiency, sealing combustion pressure while managing oil consumption and blow-by. WSM rings deliver precise tolerances and reliable performance across demanding racing and high-output applications. Order one ring per...01091505- SKU:
- 01091505
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$42.46 -
WSM Ring Set 010-916
WSM
$43.40Piston ring sets are fundamental to engine reliability and performance—they seal combustion pressure, regulate oil consumption, and directly impact power output and longevity. The WSM Ring Set 010-916 delivers OEM-quality construction with tight...010916- SKU:
- 010916
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$43.40 -
MOOSE RACING Valve Shim - 7.48 x 2.30 - 5 pack MSE5PK748230
MOOSE RACING
$9.95Precision valve train maintenance demands reliable, accurately-sized shims you can identify instantly—especially when you're deep in tuning or rebuilding. These MOOSE RACING shims eliminate guesswork with laser-etched sizing on each piece, letting you...09261880- SKU:
- 09261880
- 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
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.30 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.80 - 5 pack MSE5PK748280
MOOSE RACING
$9.95Proper valve clearance is critical to engine performance and longevity—incorrect shim selection leads to valve float, compression loss, and potential catastrophic engine damage. MOOSE Racing valve shims give you precise, reliable valve train adjustment...09261890- SKU:
- 09261890
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.80 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
$9.95 -
MOOSE RACING Inner Clutch Cover Gasket 816194
MOOSE RACING
$18.03A leaking clutch cover gasket compromises engine integrity and invites oil seepage that can damage surrounding components. The MOOSE RACING Inner Clutch Cover Gasket 816194 delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using...09346126- SKU:
- 09346126
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$18.03 -
MOOSE RACING Inner Clutch Cover Gasket 816251
MOOSE RACING
$20.86A leaking clutch cover gasket compromises engine sealing and invites oil contamination into critical drivetrain components. The MOOSE RACING Inner Clutch Cover Gasket 816251 delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using...09346131- SKU:
- 09346131
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$20.86 -
MOOSE RACING Inner Clutch Cover Gasket 816272
MOOSE RACING
$17.74A worn or damaged inner clutch cover gasket will compromise engine sealing and lead to oil leakage, performance loss, and potential internal damage. The MOOSE RACING 816272 delivers OEM-equivalent sealing reliability at a fraction of OEM pricing, using...09346136- SKU:
- 09346136
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$17.74 -
MOOSE RACING Water Pump Rebuild Kit 821998
MOOSE RACING
$53.56A failing water pump doesn't just compromise cooling efficiency—it can leave you stranded mid-race or mid-drive with catastrophic engine damage. The MOOSE RACING Water Pump Rebuild Kit 821998 gives you everything needed to restore your pump to OEM...09346542- SKU:
- 09346542
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$53.56
