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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On Sale
VESRAH Intake Valve GG-1013-IN
VESRAH
MSRP: $14.67Now: $13.94Was: $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...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
MSRP: $14.67Now: $13.94Was: $14.67 -
On Sale
VESRAH Exhaust Gasket VE-1001
VESRAH
MSRP: $11.95Now: $11.35Was: $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...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
MSRP: $11.95Now: $11.35Was: $11.95 -
On Sale
VESRAH Complete Gasket Kit - KDX200 VG-471
VESRAH
MSRP: $46.33Now: $44.01Was: $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...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
MSRP: $46.33Now: $44.01Was: $46.33 -
On Sale
VESRAH Complete Gasket Kit - KX250 VG-487
VESRAH
MSRP: $40.95Now: $38.90Was: $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...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: $38.90Was: $40.95Qty in Cart: 0Quantity:Price:MSRP: $40.95Now: $38.90Was: $40.95Subtotal: -
On Sale
VESRAH Complete Gasket Kit - KDX80 VG-489
VESRAH
MSRP: $32.97Now: $31.32Was: $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)...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
MSRP: $32.97Now: $31.32Was: $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...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
$339.74Qty in Cart: 0Quantity:Price:$339.74Subtotal: -
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...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...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...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
$24.97Qty in Cart: 0Quantity:Price:$24.97Subtotal: -
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...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...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...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
$43.40Qty in Cart: 0Quantity:Price:$43.40Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 2.30 - 5 pack MSE5PK748230
MOOSE RACING
$10.95Precision 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...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
$10.95 -
MOOSE RACING Valve Shim - 7.48 x 2.80 - 5 pack MSE5PK748280
MOOSE RACING
$10.95Proper 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...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
$10.95 -
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...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...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...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...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 -
MOOSE RACING Cylinder - Standard - KX450F MSE30011
MOOSE RACING
$402.95A damaged or worn cylinder directly kills your KX450F's performance and reliability. This MOOSE RACING replacement restores OEM-spec compression, heat management, and longevity without compromising...09310625- SKU:
- 09310625
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- MATERIAL:
- ALUMINUM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- CAST
$402.95 -
MOOSE RACING Circlip MSE72071K
MOOSE RACING
$3.95Circlips are critical fastening components that prevent axial movement and keep internal assemblies secure under extreme load conditions. A quality circlip ensures reliability during high-rpm...09130190- SKU:
- 09130190
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- SET
$3.95
