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 - Husqvarna/KTM 810374
MOOSE RACING
$73.09A top-end rebuild demands precision gaskets and seals that won't fail under race conditions or heavy use. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability at a fraction of the cost, letting you rebuild your Husqvarna or KTM engine...09345363- SKU:
- 09345363
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$73.09 -
MOOSE RACING Top End Gasket Kit - Kawasaki 810485
MOOSE RACING
$81.81A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, letting you rebuild with confidence whether you're...09345364- SKU:
- 09345364
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$81.81 -
MOOSE RACING Top End Gasket Kit - KTM 810976
MOOSE RACING
$71.76Whether you're rebuilding after a piston replacement or performing routine top-end maintenance, a quality gasket kit is non-negotiable for engine reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent sealing with domestic manufacturing...09345365- SKU:
- 09345365
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$71.76 -
MOOSE RACING Intake Valve Kit M40-40380
MOOSE RACING
$196.95OEM intake valves wear out and compromise flow efficiency—costing you power and reliability when it matters most. The MOOSE RACING Stainless Steel Intake Valve Kit M40-40380 replaces tired factory components with Black Diamond stainless steel valves...09262441- SKU:
- 09262441
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$196.95 -
MOOSE RACING Valve and Spring Kit M40-41060
MOOSE RACING
$196.95If you're running your engine hard, OEM titanium valves won't cut it—they wear fast and leave performance on the table. The MOOSE RACING Valve and Spring Kit M40-41060 swaps them out for Black Diamond stainless steel valves that last up to 4x longer...09262444- SKU:
- 09262444
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- APPLICATION:
- INTAKE
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$196.95 -
MOOSE RACING Piston Kit - 71.94 mm MSE24244B
MOOSE RACING
$235.95If you're rebuilding an engine or replacing worn pistons, you need components engineered to withstand extreme combustion pressures while minimizing thermal distortion and wear. The MOOSE RACING Piston Kit MSE24244B delivers exactly that—a gravity-cast...09105953- SKU:
- 09105953
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$235.95 -
MOOSE RACING Piston Kit - 48.45 mm MSE23637B
MOOSE RACING
$158.95When your engine's piston assembly shows signs of wear or you're rebuilding for increased durability, a quality replacement kit is essential to maintain compression, reduce blow-by, and ensure consistent performance across the power band. The MOOSE...09105954- SKU:
- 09105954
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
$158.95 -
MOOSE RACING Piston Kit - 57.95 mm MSE24101B
MOOSE RACING
$206.95A piston kit that delivers measurable reliability gains where it counts most—inside your engine. The gravity-cast aluminum construction with 18% silicon content resists thermal distortion and wear, giving you extended service life without sacrificing...09105956- SKU:
- 09105956
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 57.95 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$206.95 -
MOOSE RACING Circlip 748-050SWL
MOOSE RACING
$4.95A quality circlip is fundamental to precision assembly—this MOOSE RACING unit ensures secure retention without compromising component integrity. Whether you're rebuilding a transmission, differential, or engine subassembly, a properly sized circlip...09130072- SKU:
- 09130072
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- PRODUCT NAME:
- CIRCLIP
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- SET
$4.95 -
MOOSE RACING Banjo Washers - 25 pack 205-2500
MOOSE RACING
$22.95Banjo bolt washers are a critical consumable in any serious racer's pit kit—they degrade with heat cycles and must be replaced during brake system service to prevent fluid weeping and pressure loss. The MOOSE RACING 25-pack ensures you're never caught...17420405- SKU:
- 17420405
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$22.95 -
MOOSE RACING Complete Motor Gasket Kit - CR125 808233
MOOSE RACING
$37.82A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—especially when you're investing time and money into a fresh motor. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components...M808233- SKU:
- M808233
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$37.82 -
MOOSE RACING Complete Motor Gasket Kit - CR125 808235
MOOSE RACING
$58.40A complete engine and transmission rebuild demands precision-fit gaskets that won't compromise reliability or performance. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork of sourcing individual components, giving you every seal,...M808235- SKU:
- M808235
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$58.40 -
MOOSE RACING Complete Motor Gasket Kit - CR125R 808237
MOOSE RACING
$75.94A complete engine rebuild requires precision gasket and seal fitment—any compromise risks compression loss, oil seepage, and catastrophic engine failure. The MOOSE RACING Complete Motor Gasket Kit for CR125R eliminates guesswork with OEM-quality...M808237- SKU:
- M808237
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$75.94 -
MOOSE RACING Complete Motor Gasket Kit - CR250 808259
MOOSE RACING
$68.81A complete engine and transmission rebuild demands gasket and seal integrity you can trust—compromised seals lead to oil leaks, loss of compression, and catastrophic engine failure. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent...M808259- SKU:
- M808259
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$68.81 -
MOOSE RACING Complete Motor Gasket Kit - CRF450 808267
MOOSE RACING
$149.21A complete engine rebuild requires precision gaskets and seals that won't compromise your CRF450's reliability. This Moose Racing kit eliminates the frustration of sourcing individual components by bundling everything you need for a full engine and...M808267- SKU:
- M808267
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$149.21 -
MOOSE RACING Complete Motor Gasket Kit - XR50 808209
MOOSE RACING
$64.22A complete engine and transmission rebuild demands gasket and seal integrity—compromising here means risking oil leaks, compression loss, and costly downtime. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of...09340129- SKU:
- 09340129
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$64.22 -
MOOSE RACING Complete Motor Gasket Kit - XR70 808210
MOOSE RACING
$64.22A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. This Moose Racing kit eliminates the guesswork and expense of sourcing individual components—you get everything needed in one set, with...09340130- SKU:
- 09340130
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$64.22 -
MOOSE RACING Complete Motor Gasket Kit - CRF450R 808278
MOOSE RACING
$172.14A complete engine and transmission rebuild demands precision gaskets and seals that won't fail mid-season. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent quality at a fraction of the cost, with every gasket, o-ring, and valve seal...09341437- SKU:
- 09341437
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$172.14 -
MOOSE RACING Complete Motor Gasket Kit - 450SXF/450XCF 808331
MOOSE RACING
$121.47A complete engine and transmission rebuild demands gaskets and seals that won't compromise durability or performance. This MOOSE RACING kit eliminates the guesswork by delivering every gasket, o-ring, and valve seal you need in one package—all...09341438- SKU:
- 09341438
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$121.47 -
MOOSE RACING Top End Gasket Kit - CRF150R 810213
MOOSE RACING
$67.01A quality top-end gasket kit is essential when rebuilding a CRF150R engine, whether you're replacing a worn piston or performing routine maintenance. The MOOSE RACING 810213 delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using...09341439- SKU:
- 09341439
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$67.01
