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 Valve Cover Gasket - Kawasaki 817917
MOOSE RACING
$26.92A leaking valve cover gasket compromises engine sealing integrity and can lead to oil seepage that damages surrounding components. MOOSE RACING's OEM-quality gasket restores proper compression and prevents costly oil leaks on your Kawasaki engine. This...09346899- SKU:
- 09346899
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- TYPE:
- VALVE COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$26.92 -
MOOSE RACING Complete Motor Gasket Kit - RMZ450/RMX450 808595
MOOSE RACING
$150.60A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or wallet. This MOOSE Racing kit gives you every gasket, O-ring, and valve seal needed for a full rebuild at a fraction of OEM pricing. Built...09341897- SKU:
- 09341897
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$150.60 -
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 seals at a fraction of manufacturer pricing, letting you...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 fitment and durability at a fraction of OEM pricing,...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 fraction of the cost, using high-tech materials engineered...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 replacement restores OEM performance specifications while...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 modification or custom fabrication—just bolt it on and...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 Cylinder restores your engine to OEM specifications with...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
$358.95 -
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 pricing, so you can confidently reassemble your RMZ250...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 delivers OEM-quality replacement seals and gaskets at a...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 to restore a proper seal at a fraction of OEM pricing...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, ensuring reliable valve actuation and protecting your...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 that's 15% denser than standard steel, this flywheel...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 uses 303 stainless steel—15% denser than standard...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 steel—to pack maximum mass into a compact design without...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 advantage through precision machining of 303 stainless...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 achieves superior mass density using 303 stainless...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 achieves this without bulk by using 303 stainless...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 performance advantage through precision machining and superior...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 dangerous play, keeping your timing chain under...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
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal:
