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 Ignition Cover Gasket 816721
MOOSE RACING
$8.83A quality ignition cover gasket is critical to preventing oil seepage and maintaining proper engine sealing—especially in high-performance applications where heat and vibration accelerate gasket degradation. The MOOSE Racing 816721 delivers reliable...09346163- SKU:
- 09346163
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$8.83 -
MOOSE RACING Top End Gasket Kit 8100009
MOOSE RACING
$70.36A top-end rebuild demands precision and reliability—this gasket kit delivers both without the OEM price tag. Engineered with high-tech materials and manufactured to exact tolerances, you get the durability of genuine seals with the cost-effectiveness of...09346442- SKU:
- 09346442
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$70.36 -
MOOSE RACING Top End Gasket Kit - Yamaha 8100022
MOOSE RACING
$29.19A top-end gasket kit is essential when rebuilding your engine or replacing pistons—it ensures proper sealing at every critical junction and prevents oil leaks, combustion bypass, and premature wear. MOOSE Racing delivers OEM-equivalent reliability at a...09346443- SKU:
- 09346443
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$29.19 -
MOOSE RACING Top End Gasket Kit - Kawasaki 8100023
MOOSE RACING
$87.56A top-end rebuild demands precision-matched components that won't compromise reliability or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction of the OEM price, giving you confidence that every critical...09346444- SKU:
- 09346444
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$87.56 -
MOOSE RACING Top End Gasket Kit - KTM 8100024
MOOSE RACING
$43.01A top-end rebuild demands precision-matched components that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction of manufacturer pricing, eliminating the risk of cheap...09346445- SKU:
- 09346445
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$43.01 -
MOOSE RACING Top End Gasket Kit - RM-Z 250 810567
MOOSE RACING
$75.98A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance at a fraction of the cost, with U.S.-manufactured components engineered...09342207- SKU:
- 09342207
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$75.98 -
MOOSE RACING Top End Gasket Kit - YZ450F 810689
MOOSE RACING
$71.71A top-end rebuild demands precision-matched components—mismatched or worn gaskets will compromise compression, cause oil leakage, and accelerate wear on fresh internals. The MOOSE RACING Top End Gasket Kit eliminates guesswork by supplying every OEM-spec...09342208- SKU:
- 09342208
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$71.71 -
MOOSE RACING Complete Motor Gasket Kit - KDX220 808445
MOOSE RACING
$70.11A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your KDX220's reliability. This Moose Racing kit eliminates the hassle of sourcing individual components and delivers OEM-quality seals at a fraction...M808445- SKU:
- M808445
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- TYPE:
- ENGINE
$70.11 -
MOOSE RACING Top End Gasket Kit - CR125R 810244
MOOSE RACING
$49.60A complete top-end rebuild demands precision-matched gaskets and seals—anything less risks compression loss, oil leakage, and engine failure. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of factory pricing, so you can...09340454- SKU:
- 09340454
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$49.60 -
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 - 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 010-915-05
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
