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 Crank Bearing - Gas Gas 24-1115
MOOSE RACING
$160.95A worn or failing crankshaft bearing will tank your engine's reliability and performance faster than a seized piston. The MOOSE RACING Crank Bearing Kit (Gas Gas 24-1115) delivers...09240290- SKU:
- 09240290
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- STREET
$160.95 -
MOOSE RACING Water Pump Rebuild Kit 821302
MOOSE RACING
$63.04A failing water pump compromises your engine's cooling efficiency and puts your entire drivetrain at risk. Rather than replacing the entire assembly, this MOOSE Racing rebuild kit lets you restore...09345192- SKU:
- 09345192
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$63.04 -
MOOSE RACING Water Pump Rebuild Kit 821312
MOOSE RACING
$56.37A failing water pump can compromise your engine's cooling efficiency and derail your race day or project timeline. This MOOSE RACING rebuild kit gives you everything needed to restore your water pump...09345194- SKU:
- 09345194
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$56.37 -
MOOSE RACING Water Pump Rebuild Kit 821318
MOOSE RACING
$35.70A failing water pump can catastrophically compromise engine cooling and cost thousands in repairs. This MOOSE RACING rebuild kit lets you restore your water pump to OEM specifications with all...09345196- SKU:
- 09345196
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$35.70 -
MOOSE RACING Water Pump Rebuild Kit 821319
MOOSE RACING
$46.30A failing water pump can leave you stranded mid-season, compromising engine cooling and risking catastrophic damage. The MOOSE RACING Water Pump Rebuild Kit 821319 gives you everything needed to...09345197- SKU:
- 09345197
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$46.30 -
On Sale
VESRAH Complete Gasket Kit - YZ 85 VG-2149
VESRAH
MSRP: $44.35Now: $42.13Was: $44.35A complete engine rebuild demands precision gaskets that seal under extreme combustion pressures—compromised seals lead to oil leaks, lost compression, and catastrophic engine failure. The VESRAH...09340963- SKU:
- 09340963
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
MSRP: $44.35Now: $42.13Was: $44.35 -
WSM Piston Rings 010-920-05
WSM
$36.88Piston rings are critical to engine performance—they seal combustion pressure, regulate oil consumption, and directly impact horsepower delivery and engine longevity. Worn or inadequate rings result...01092005- SKU:
- 01092005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- SET
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$36.88 -
WSM Piston Rings 010-925
WSM
$24.97Piston rings are critical to engine performance—they seal combustion pressure, manage oil consumption, and directly impact power output and longevity. WSM Piston Rings 010-925 deliver consistent...010925- SKU:
- 010925
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- SET
$24.97 -
WSM Piston Rings 010-925-04
WSM
$23.31Piston rings are critical to engine performance—they seal combustion pressure, regulate oil consumption, and maintain compression in your cylinder. Worn or substandard rings directly kill horsepower,...01092504- SKU:
- 01092504
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON RING
- BORE - OVERSIZE:
- +0,25 MM
- UNITS:
- SET
$23.31 -
WSM Piston Rings 010-925-05
WSM
$24.97Piston rings are critical to engine performance—they create the seal between pistons and cylinder walls that maintains compression, controls oil consumption, and prevents blowby. WSM Piston Rings...01092505- SKU:
- 01092505
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$24.97 -
WSM Piston Rings 010-925-06
WSM
$24.97Piston rings are critical wear items that directly impact compression, blow-by control, and oil consumption—neglecting them leads to power loss and engine damage. WSM Piston Rings 010-925-06 deliver...01092506- SKU:
- 01092506
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- UNITS:
- SET
- BORE - OVERSIZE:
- +0,75 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.75 MM
$24.97 -
WSM Piston Rings 010-929-04
WSM
$34.43Piston rings are critical wear components that directly impact compression, oil control, and engine longevity. WSM Piston Rings 010-929-04 deliver precise tolerances and reliable sealing across the...01092904- SKU:
- 01092904
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- UNITS:
- SET
$34.43Qty in Cart: 0Quantity:Price:$34.43Subtotal: -
WSM Piston Rings 010-930
WSM
$28.34Piston rings are critical to engine sealing and compression—worn or substandard rings lead to blowby, oil consumption, and power loss. WSM Piston Rings 010-930 deliver precise tolerances and reliable...010930- SKU:
- 010930
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
$28.34 -
WSM Piston Rings 010-931
WSM
$24.97Piston rings are critical wear items that directly impact compression, blow-by control, and oil consumption—factors that determine whether your engine delivers peak performance or falls short. WSM...010931- SKU:
- 010931
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
$24.97Qty in Cart: 0Quantity:Price:$24.97Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816350
MOOSE RACING
$19.17A failing clutch cover gasket leads to oil seepage, contaminated clutch surfaces, and potential engine damage—exactly why you need a precision replacement that seals reliably. The MOOSE RACING Inner...09346590- SKU:
- 09346590
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- MOUNTING POSITION:
- INNER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$19.17Qty in Cart: 0Quantity:Price:$19.17Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816672
MOOSE RACING
$16.90A leaking clutch cover gasket compromises engine sealing and invites oil contamination into your clutch assembly—exactly what your precision machinery doesn't need. This OEM-equivalent gasket from...09346160- SKU:
- 09346160
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$16.90 -
MOOSE RACING Inner Clutch Cover Gasket 816752
MOOSE RACING
$24.68A leaking clutch cover gasket compromises engine sealing and invites oil contamination into your clutch system—exactly what you can't afford mid-race or mid-rebuild. The MOOSE RACING Inner Clutch...09346167- SKU:
- 09346167
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$24.68Qty in Cart: 0Quantity:Price:$24.68Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816757
MOOSE RACING
$33.38A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly what you don't need mid-race or mid-project. The MOOSE RACING Inner Clutch Cover Gasket...09346169- SKU:
- 09346169
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$33.38 -
MOOSE RACING Motor Seals - YZ250 822304
MOOSE RACING
$33.45A complete engine seal failure can sideline your YZ250 indefinitely—and OEM replacement kits come with premium pricing that cuts into your race budget. MOOSE Racing Motor Seals deliver genuine...09350113- SKU:
- 09350113
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
$33.45 -
MOOSE RACING Exhaust Gasket Kit 823171
MOOSE RACING
$6.76A compromised exhaust seal is a silent performance killer—leaking combustion gases not only reduce horsepower but also introduce contaminants into your engine bay and compromise system reliability...09346686- SKU:
- 09346686
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$6.76Qty in Cart: 0Quantity:Price:$6.76Subtotal:
