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 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
$56.32Qty in Cart: 0Quantity:Price:$56.32Subtotal: -
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
$80.18Qty in Cart: 0Quantity:Price:$80.18Subtotal: -
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
$15.92Qty in Cart: 0Quantity:Price:$15.92Subtotal: -
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
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
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 -
Wrench Rabbit Engine Rebuild Kit for Suzuki RM250 2006-2008 WR101-065
WRENCH RABBIT
$920.95A complete engine rebuild requires precision-engineered components working in harmony—and sourcing them individually wastes time and introduces compatibility risks. The Wrench Rabbit Engine Rebuild Kit for your RM250 consolidates everything into one...09031003- SKU:
- 09031003
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$920.95 -
SHINDY Needle Bearing -14 mm x 18 mm x 19 mm 10-051
SHINDY
$8.95Precision piston pin needle bearings are critical to engine reliability and performance, especially under high RPM conditions where lateral forces demand exact tolerances. SHINDY's 14mm x 18mm x 19mm bearing maintains consistent performance across...NB1450- SKU:
- NB1450
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 14 MM
- APPLICATION:
- PISTON
- INSIDE DIAMETER:
- 14 MM
- LENGTH METRIC:
- 19 MM
- TYPE:
- NEEDLE
- LENGTH:
- 19 MM
- UNITS:
- EACH
- OUTSIDE DIAMETER:
- 18 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$8.95 -
MOOSE RACING Magnetic Drain Plug T14-3081S
MOOSE RACING
$17.95Metal particles naturally circulate through your engine oil during normal operation—particularly during break-in periods or after high-mileage wear. A magnetic drain plug captures these ferrous contaminants before they can cause accelerated bearing wear,...09200195- SKU:
- 09200195
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- MAGNETIC
- TYPE:
- DRAIN
- COLOR/FINISH:
- ANODIZED CLEAR
- COLOR/FINISH:
- SILVER
- DIAMETER - THREAD SIZE METRIC:
- M12 X 1.25 X 10 MM
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$17.95 -
MOOSE RACING Top End Gasket Kit - YZ 125 810634
MOOSE RACING
$24.85When you're rebuilding a YZ 125 top end, you need gaskets and seals engineered for precision and durability—not OEM pricing. The MOOSE RACING Top End Gasket Kit delivers complete coverage with U.S.-made components that handle high-compression...M810634- SKU:
- M810634
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$24.85Qty in Cart: 0Quantity:Price:$24.85Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ 125 810635
MOOSE RACING
$24.85A top-end rebuild demands precision seals and gaskets that won't compromise your engine's integrity or your wallet. The MOOSE RACING gasket kit eliminates the guesswork with a complete, US-manufactured set engineered to OEM specifications—giving you the...M810635- SKU:
- M810635
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$24.85
