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 Motor Gasket Kit with Seal - RMZ450 811595
MOOSE RACING
$183.26A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work—or your wallet. The MOOSE RACING Motor Gasket Kit delivers OEM-quality replacement...09341898- SKU:
- 09341898
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$183.26 -
MOOSE RACING Ignition Cover Gasket 816693
MOOSE RACING
$8.29A leaking ignition cover gasket compromises engine sealing and can lead to oil weeping that accelerates wear on surrounding components. The MOOSE RACING Ignition Cover Gasket delivers OEM-equivalent...09341899- SKU:
- 09341899
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$8.29 -
MOOSE RACING Clutch Cover Gasket 816701
MOOSE RACING
$12.14A leaking clutch cover gasket can compromise engine integrity and lead to costly oil seepage issues. The MOOSE RACING Clutch Cover Gasket 816701 delivers OEM-equivalent sealing performance at a...09341900- SKU:
- 09341900
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$12.14 -
MOOSE RACING Cylinder - Standard - KX250F MSE30012
MOOSE RACING
$402.95A worn or damaged cylinder directly undermines your KX250F's compression, throttle response, and overall reliability—especially if you're pushing hard on the track or trail. This MOOSE RACING...09310881- SKU:
- 09310881
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$402.95 -
MOOSE RACING Cylinder - Standard - YZ450F MSECW20012
MOOSE RACING
$427.95A worn or damaged cylinder directly compromises your YZ450F's compression, power delivery, and engine longevity. This MOOSE RACING replacement restores your bike to factory performance specs without...09310882- SKU:
- 09310882
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- COLOR/FINISH:
- GRAY
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- STANDARD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 97,00 MM
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- DISPLACEMENT:
- 450 CC
$427.95 -
MOOSE RACING Cylinder - Standard - Suzuki MSECW40005
MOOSE RACING
$358.95A worn or damaged cylinder directly impacts compression, heat management, and overall engine reliability—three non-negotiables for consistent track performance or trail duty. The MOOSE RACING...09310974- SKU:
- 09310974
- Availability:
- Ships Same Business Day
- Weight:
- 2.36 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
$358.95Qty in Cart: 0Quantity:Price:$358.95Subtotal: -
MOOSE RACING Top End Gasket Kit - RMZ250 810568
MOOSE RACING
$74.59A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of OEM...09341269- SKU:
- 09341269
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$74.59 -
MOOSE RACING Complete Motor Gasket Kit - YZ250 808669
MOOSE RACING
$61.34A complete engine and transmission rebuild demands gasket and seal integrity—any compromise leads to oil leaks, contamination, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit...09341517- SKU:
- 09341517
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$61.34 -
MOOSE RACING Ignition Cover Gasket 816677
MOOSE RACING
$11.22A leaking ignition cover gasket compromises engine sealing and invites oil contamination into critical systems. MOOSE RACING's OEM-equivalent gasket delivers the precise fit and durability you need...09341459- SKU:
- 09341459
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$11.22 -
On Sale
TMV Camchain Tensioner 138361060
TMV
MSRP: $110.95Now: $71.00Was: $110.95A worn camchain tensioner compromises valve timing precision and can escalate into catastrophic engine damage if left unaddressed. The TMV Camchain Tensioner 138361060 restores optimal chain tension,...09220177- SKU:
- 09220177
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- TENSIONER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM CHAIN
MSRP: $110.95Now: $71.00Was: $110.95 -
TMV Flywheel Weight 310FW1211
TMV
$152.95A flywheel is only as effective as its mass characteristics—and the TMV 310FW1211 delivers superior rotational inertia without sacrificing space or adding complexity. By using 303 stainless steel...09220085- SKU:
- 09220085
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- MATERIAL:
- 303 STAINLESS STEEL
$152.95 -
TMV Flywheel Weight 310FW1213
TMV
$152.95A heavier flywheel reduces engine rev hang and improves throttle response by increasing rotational inertia, giving you more control during aggressive driving and precision shifts. The TMV 310FW1213...09220086- SKU:
- 09220086
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- UNITS:
- EACH
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 303 STAINLESS STEEL
$152.95 -
TMV Flywheel Weight 310FW1313
TMV
$181.95A heavier flywheel stabilizes engine operation and improves throttle response by storing rotational energy more efficiently. The TMV 310FW1313 uses 303 stainless steel—15% denser than standard...09220089- SKU:
- 09220089
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$181.95 -
TMV Flywheel Weight 310FW5109
TMV
$152.95A heavier flywheel increases rotational inertia, delivering smoother power delivery and improved acceleration response across a broader RPM range. The TMV 310FW5109 achieves this critical mass...09220090- SKU:
- 09220090
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- UNITS:
- EACH
- FEATURES:
- FLYWHEEL WEIGHT - 9 OZ.
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- FLYWHEEL WEIGHT
$152.95 -
TMV Flywheel Weight 310FW5111
TMV
$152.95A heavier flywheel stabilizes engine RPM and improves throttle response, especially crucial for high-revving applications where rotational mass directly impacts power delivery. The TMV 310FW5111...09220091- SKU:
- 09220091
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- FEATURES:
- FLYWHEEL WEIGHT - 11 OZ.
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$152.95 -
TMV Flywheel Weight 310FW5113
TMV
$152.95A heavier flywheel stores more rotational energy, delivering smoother power delivery and more predictable throttle response—critical for precision driving where consistency matters. The TMV 310FW5113...09220092- SKU:
- 09220092
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- UNITS:
- EACH
$152.95 -
TMV Flywheel Weight 310FW2213
TMV
$152.95A heavier flywheel increases engine inertia, delivering smoother power delivery and more predictable throttle response under acceleration and gear transitions. The TMV 310FW2213 achieves this...09220101- SKU:
- 09220101
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- MATERIAL:
- 303 STAINLESS STEEL
- PRODUCT NAME:
- FLYWHEEL WEIGHT
- FEATURES:
- FLYWHEEL WEIGHT - 13 OZ.
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$152.95 -
TMV Camchain Tensioner - Blue 138101012BU
TMV
$108.95Excessive timing chain slack is a silent killer—it allows the chain to slap against guides and can force your pistons and valves into catastrophic contact. The TMV Camchain Tensioner eliminates this...09251322- SKU:
- 09251322
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- BLUE
- PRODUCT NAME:
- CAM CHAIN TENSIONER
$108.95 -
TMV Camchain Tensioner - Orange 138101012OR
TMV
$108.95Excessive timing chain slack is a silent killer—it allows destructive movement between your crankshaft and camshaft, risking catastrophic piston-to-valve contact and engine failure. The TMV Camchain...09251323- SKU:
- 09251323
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BASE COLOR:
- ORANGE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAM CHAIN TENSIONER
- UNITS:
- EACH
$108.95 -
MOOSE RACING Valve Shim - 7.48 x 2.95 - 5 pack MSE5PK748295
MOOSE RACING
$9.95Valve shim maintenance is critical to maintaining proper valve clearance and engine performance—spec drift in your valve train directly impacts combustion efficiency and longevity. This 5-pack of...09261893- SKU:
- 09261893
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal:
