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 - YZ450F 810997
MOOSE RACING
$87.72A top-end rebuild demands gaskets and seals that match OEM precision without the OEM price tag. The MOOSE RACING Top End Gasket Kit delivers U.S.-manufactured components engineered for reliability and accurate fitment, so you can confidently reassemble...09346110- SKU:
- 09346110
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
$87.72 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Honda 811248
MOOSE RACING
$91.46A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—this kit eliminates the tedious sourcing of individual components while delivering OEM-quality reliability at a fraction of the cost. Whether...09346111- SKU:
- 09346111
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$91.46Qty in Cart: 0Quantity:Price:$91.46Subtotal: -
MOOSE RACING Complete Motor Gasket Kit with Seals - Suzuki 811983
MOOSE RACING
$182.97A complete engine and transmission rebuild demands precision-fit gaskets and seals—factory OEM replacements that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit eliminates the tedious sourcing of individual components while...09346112- SKU:
- 09346112
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$182.97 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Yamaha 811997
MOOSE RACING
$172.74A complete engine rebuild requires precision gaskets and seals that maintain proper compression and prevent fluid leakage—compromises here lead to performance loss and costly damage. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by...09346113- SKU:
- 09346113
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$172.74 -
MOOSE RACING Magnetic Drain Plug T14-2081S
MOOSE RACING
$17.95Engine wear is silent until it's expensive. A magnetic drain plug captures ferrous metal particles that circulate through your oil, giving you early warning of internal component degradation before catastrophic failure occurs. By switching to the MOOSE...09200193- SKU:
- 09200193
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- ANODIZED CLEAR
- FEATURES:
- MAGNETIC
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- DIAMETER - THREAD SIZE METRIC:
- M10 X 1.5 X 15 MM
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
$17.95Qty in Cart: 0Quantity:Price:$17.95Subtotal: -
MOOSE RACING Magnetic Drain Plug T14-2082S
MOOSE RACING
$17.95Engine wear begins the moment oil circulates, carrying ferrous particles that accumulate over thousands of miles. The MOOSE RACING Magnetic Drain Plug T14-2082S captures these metal filings before they circulate back through your engine, extending...09200194- SKU:
- 09200194
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- ANODIZED CLEAR
- DIAMETER - THREAD SIZE METRIC:
- M10 X 1.5 X 22 MM
- FEATURES:
- MAGNETIC
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- UNITS:
- EACH
$17.95 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811235
MOOSE RACING
$74.29A complete engine and transmission rebuild demands gaskets and seals that fit precisely and hold up under load—and OEM replacements can drain your budget fast. This Moose Racing Motor Gasket Kit delivers genuine OEM-quality seals at a fraction of the...M811235- SKU:
- M811235
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$74.29 -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811254
MOOSE RACING
$81.65Engine and transmission rebuilds demand precision and reliability—a single failed gasket or seal can compromise hours of machine work and thousands in parts investment. The MOOSE RACING Motor Gasket Kit delivers OEM-quality seals at a fraction of...M811254- SKU:
- M811254
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$81.65Qty in Cart: 0Quantity:Price:$81.65Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM65 811412
MOOSE RACING
$67.72A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't fail under race conditions or heavy use. The MOOSE RACING Motor Gasket Kit eliminates the guesswork and expense of sourcing individual components by delivering...M811412- SKU:
- M811412
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$67.72Qty in Cart: 0Quantity:Price:$67.72Subtotal: -
MOOSE RACING Top End Gasket Kit - CR250R 810257
MOOSE RACING
$33.51When you're rebuilding a CR250R top end, you need gaskets and seals that won't let you down—and OEM replacements can drain your wallet fast. This Moose Racing kit gives you every gasket, O-ring, and seal required for a complete rebuild at a fraction of...M810257- SKU:
- M810257
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$33.51Qty in Cart: 0Quantity:Price:$33.51Subtotal: -
MOOSE RACING Top End Gasket Kit - XL/XR250 810258
MOOSE RACING
$80.32When you're rebuilding a top end, every gasket and seal matters—factory tolerances demand precision, and substandard materials lead to leaks, compression loss, and catastrophic failure. The MOOSE RACING Top End Gasket Kit gives you OEM-quality seals at a...M810258- SKU:
- M810258
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$80.32 -
MOOSE RACING Top End Gasket Kit - CR250R 810259
MOOSE RACING
$41.54When you're rebuilding a CR250R top end, using a complete OEM-quality gasket kit eliminates guesswork and ensures proper sealing from the first fire-up. The MOOSE RACING Top End Gasket Kit gives you every seal and gasket needed for a professional rebuild...M810259- SKU:
- M810259
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$41.54 -
MOOSE RACING Top End Gasket Kit - CR250 810260
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to restore your CR250 with confidence...M810260- SKU:
- M810260
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- THICKNESS METRIC:
- 2.50 MM
- THICKNESS IMPERIAL:
- 0,100'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51Qty in Cart: 0Quantity:Price:$33.51Subtotal: -
LA Sleeve Cylinder Sleeve 54mm Bore Suzuki RM125 2004-2007 FL5532
LA SLEEVE
$127.95When your RM125's cylinder shows signs of wear—scoring, pitting, or loss of compression—a quality sleeve restores your engine to factory spec without requiring a complete cylinder replacement. The LA SLEEVE FL5532 is precision-engineered for the...09310040- SKU:
- 09310040
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
LA Sleeve Cylinder Sleeve 45mm Bore 2003-2008 KTM 65 SX FL5550
LA SLEEVE
$117.95A worn or damaged cylinder sleeve compromises compression, reduces power output, and accelerates further engine wear—ultimately shortening your 2003-2008 KTM 65 SX's lifespan. The LA SLEEVE FL5550 restores your engine to factory compression standards,...09310042- SKU:
- 09310042
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$117.95 -
LA Sleeve Cylinder Sleeve 54mm Bore Honda CR125R 1987-1988 H5001
LA SLEEVE
$137.95A worn cylinder sleeve compromises compression, sealing, and overall engine reliability—critical issues in competitive two-stroke racing where every horsepower and consistency matters. The LA SLEEVE H5001 is a precision-engineered replacement that...09310047- SKU:
- 09310047
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$137.95 -
LA Sleeve Cylinder Sleeve for Yamaha YFZ450 2004-2013 YA5495
LA SLEEVE
$127.95A worn cylinder compromises compression, power output, and fuel efficiency—especially critical on high-performance machines like the YFZ450. The LA SLEEVE Cylinder Sleeve YA5495 restores your engine to original specifications without requiring a full...09310070- SKU:
- 09310070
- Availability:
- Ships Same Business Day
- Weight:
- 1.59 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$127.95 -
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX250F 2017-2019 30012-K02
CYLINDER WORKS
$704.95Your KX250F's stock cylinder will eventually wear—piston blow-by, lost compression, and increased friction are inevitable. The Cylinder Works Standard Bore Kit restores your engine to peak efficiency with OEM-matched specifications and Vertex pistons...09310727- SKU:
- 09310727
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$704.95 -
Cylinder Works Kawasaki KX 250 F 2017-2019 Standard Bore High Compression Cylinder Kit 30012-K02HC
CYLINDER WORKS
$773.95Factory cylinder wear reduces compression and robs your KX 250 F of peak power delivery. This Cylinder Works kit restores lost performance with matched Vertex pistons and nickel silicon carbide plating that outlasts OEM components. Bolt-on installation...09310729- SKU:
- 09310729
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.3:1
$773.95 -
Cylinder Works Big Bore Gasket Kit Yamaha YFZ450R 2009-2019 21003-G01
CYLINDER WORKS
$112.95Stock cylinders wear down over time, causing compression loss, increased blow-by, and sluggish throttle response. The Cylinder Works Big Bore Gasket Kit delivers a straightforward path to restore and exceed your YFZ450R's original performance without the...09341699- SKU:
- 09341699
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- MATERIAL:
- NICKEL SILICON CARBIDE
$112.95Qty in Cart: 0Quantity:Price:$112.95Subtotal:
