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
-
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...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...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...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...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...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...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...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 -
On Sale
KIBBLEWHITE Intake Valve Guide 30-30610
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $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...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
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 30-30620
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $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...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
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Intake Valve Guide 60-60060
KIBBLEWHITE
MSRP: $14.34Now: $12.91Was: $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...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
MSRP: $14.34Now: $12.91Was: $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...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,...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...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 -
On Sale
Wossner Piston Kit Kawasaki KX85 2001-2025 8082DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $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...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
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $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...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...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
$920.95Qty in Cart: 0Quantity:Price:$920.95Subtotal: -
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...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...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...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,...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
