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 Top End Gasket Kit - KE 100 810408
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability at a fraction of the price, with every component you need to...M810408- SKU:
- M810408
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51 -
MOOSE RACING Top End Gasket Kit - KX 100 810409
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise performance or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealer pricing, so you can confidently refresh your KX 100's...M810409- SKU:
- M810409
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51 -
MOOSE RACING Top End Gasket Kit - KX 80 810410
MOOSE RACING
$24.85Whether you're rebuilding after a piston replacement or maintaining peak compression, this gasket kit eliminates the guesswork and cost of sourcing individual seals and gaskets. Moose Racing delivers OEM-equivalent reliability at a fraction of the price,...M810410- SKU:
- M810410
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85 -
MOOSE RACING Top End Gasket Kit - KX/RM100 810411
MOOSE RACING
$37.29When you're rebuilding a top end, every gasket and seal matters—cheap compromises lead to oil leaks, compression loss, and catastrophic failures. The MOOSE RACING Top End Gasket Kit gives you OEM-quality seals at a fraction of the cost, with U.S.A.-made...M810411- SKU:
- M810411
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$37.29 -
MOOSE RACING Clutch Cover Gasket 817988
MOOSE RACING
$13.64A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination. The MOOSE RACING Clutch Cover Gasket 817988 delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using high-tech materials...09345899- SKU:
- 09345899
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$13.64 -
MOOSE RACING Head Cover Gasket 819037
MOOSE RACING
$19.21A leaking valve cover gasket forces oil past its seal, compromising engine cleanliness and potentially damaging surrounding components. OEM replacements carry premium pricing for a simple elastomer component—Moose Racing delivers genuine-quality...09345900- SKU:
- 09345900
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
$19.21Qty in Cart: 0Quantity:Price:$19.21Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811403
MOOSE RACING
$53.47A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your freshly machined components. MOOSE RACING delivers OEM-equivalent performance at a fraction of the cost, allowing you to rebuild with confidence...M811403- SKU:
- M811403
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$53.47 -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811404
MOOSE RACING
$56.32A complete engine and transmission rebuild demands precision gaskets and seals that fit right the first time—factory tolerances with aftermarket affordability. MOOSE Racing delivers OEM-equivalent components engineered specifically for the KX80,...M811404- SKU:
- M811404
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$56.32 -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811405
MOOSE RACING
$56.32A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or your budget. MOOSE Racing delivers OEM-equivalent performance at a fraction of the cost, letting you rebuild with confidence and recoup...M811405- SKU:
- M811405
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$56.32Qty in Cart: 0Quantity:Price:$56.32Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM60 811407
MOOSE RACING
$52.05A complete engine and transmission rebuild requires precision components that won't compromise reliability or drain your budget. This Moose Racing gasket and seal kit delivers OEM-quality fitment at a fraction of OEM pricing, giving you the confidence to...M811407- SKU:
- M811407
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$52.05 -
MOOSE RACING Motor Gasket Kit with Seal - KX100 811409
MOOSE RACING
$78.83A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your engine's integrity or drain your wallet. MOOSE Racing's comprehensive gasket kit delivers OEM-quality replacement seals at a fraction of dealership...M811409- SKU:
- M811409
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$78.83 -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM100 811411
MOOSE RACING
$80.18A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or wallet. MOOSE RACING's Motor Gasket Kit delivers genuine OEM-quality seals at a fraction of OEM pricing, giving you the confidence to...M811411- SKU:
- M811411
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$80.18 -
KIBBLEWHITE Intake Valve Guide 30-30610
KIBBLEWHITE
$15.92Valve guide wear is one of the most common failure points in high-revving engines, causing oil consumption, poor combustion sealing, and eventual valve seat damage. The KIBBLEWHITE Intake Valve Guide 30-30610 is engineered with Ampco-45 bronze alloy to...09300032- SKU:
- 09300032
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.1961'
- MATERIAL:
- AMPCO-45
- OUTSIDE DIAMETER IMPERIAL:
- 0.3965'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
$15.92 -
KIBBLEWHITE Exhaust Valve Guide 30-30620
KIBBLEWHITE
$15.92Valve guides are critical to engine longevity—they control oil consumption, maintain precise valve sealing, and prevent catastrophic wear that can compromise your entire cylinder head. The KIBBLEWHITE 30-30620 exhaust valve guide is engineered with...09300033- SKU:
- 09300033
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.1956'
- MATERIAL:
- AMPCO-45
- OUTSIDE DIAMETER IMPERIAL:
- 0.3965'
- PRODUCT NAME:
- VALVE GUIDE
$15.92 -
KIBBLEWHITE Intake Valve Guide 60-60060
KIBBLEWHITE
$14.34Valve guide wear is one of the primary causes of compression loss and oil consumption in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 60-60060 restores proper valve seat geometry and clearance, ensuring consistent sealing and optimal...09300034- SKU:
- 09300034
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4167'
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- STREET
- MATERIAL:
- AMPCO-45
$14.34 -
MOOSE RACING Oil Seal Kit 822995
MOOSE RACING
$43.37Engine seals are critical wear items that deteriorate over time, leading to oil leaks, contamination, and potential engine damage. The MOOSE RACING Oil Seal Kit 822995 gives you complete crankshaft and main seal coverage in one comprehensive package,...09351056- SKU:
- 09351056
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- UNITS:
- KIT
- APPLICATION:
- ENGINE
$43.37 -
MOOSE RACING Oil Seal Set - Honda 822996
MOOSE RACING
$50.56Engine seals are critical wear items that prevent oil leakage and maintain proper lubrication throughout your engine. A complete seal failure can lead to catastrophic oil loss and engine damage, making a quality replacement set essential for any rebuild...09351057- SKU:
- 09351057
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$50.56 -
MOOSE RACING Oil Cap Kit - Honda T14-6302R
MOOSE RACING
$28.95A quality oil cap isn't just a cover—it's a seal against contamination and pressure loss that directly impacts engine longevity. The MOOSE RACING Oil Cap Kit delivers OEM-equivalent reliability with the durability you need for track use or...09500966- SKU:
- 09500966
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CAP KIT
$28.95 -
Wossner Piston Kit Kawasaki KX85 2001-2025 8082DB
WOSSNER
$152.00A 2-stroke piston kit is the core of your engine's power delivery—wear or damage here directly impacts throttle response, compression, and reliability. The Wossner 8082DB is engineered specifically for the Kawasaki KX85, combining German precision with...09105507- SKU:
- 09105507
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
$152.00 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005 Suzuki RM250 WR101-064
WRENCH RABBIT
$920.95A two-stroke rebuild demands precision—worn pistons, bearings, and seals compromise power delivery and engine longevity. The Wrench Rabbit Complete Engine Rebuild Kit for your 2005 Suzuki RM250 consolidates virtually every internal component you'll need...09031002- SKU:
- 09031002
- Availability:
- Ships Same Business Day
- Weight:
- 14.40 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$920.95
