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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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POWERSTANDS RACING Drain Plug 00-01948-22
POWERSTANDS RACING
$25.95A quality drain plug might seem like a small detail, but it's one of the most critical connections in your engine bay. The POWERSTANDS RACING Drain Plug keeps your oil sealed tight while the embedded magnet captures ferrous particles, protecting your...09200113- SKU:
- 09200113
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- ALUMINUM
- TYPE:
- OIL DRAIN
- COLOR/FINISH:
- BLACK
- DIAMETER - THREAD SIZE METRIC:
- M14 X 1.25
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BOLT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$25.95 -
WSM Piston Kit - Sea-Doo - +.5 mm 010-815-05K
WSM
$73.24Stock pistons are a compromise between cost and performance—but your Sea-Doo engine deserves better. WSM Piston Kits deliver OEM-equivalent quality with measurable gains in durability and power through advanced materials and precision engineering...01081505- SKU:
- 01081505
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 76.00 MM
$73.24 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6006
MOOSE RACING
$31.95Front sprocket replacements demand precision assembly, and overlooking the countershaft fasteners can compromise your drivetrain's integrity and longevity. The MOOSE RACING Washer/Snap Ring Counter Shaft keeps critical components securely seated,...09350488- SKU:
- 09350488
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- WASHER
- UNITS:
- 10 PACK
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
$31.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KDX 25-4036
MOOSE RACING
$29.95A worn countershaft sprocket seal is a common failure point that leads to oil leakage, contamination, and premature bearing wear. The MOOSE RACING Countershaft Sprocket Seal Kit delivers a complete replacement solution with hardened steel components and...09350841- SKU:
- 09350841
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.95 -
MOOSE RACING Water Pump Rebuild Kit 821585
MOOSE RACING
$76.89A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage and race-ending downtime. The MOOSE RACING Water Pump Rebuild Kit 821585 gives you everything needed to restore your pump to factory specifications...09345245- SKU:
- 09345245
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REPAIR KIT
$76.89 -
MOOSE RACING Exhaust Gasket Kit 823148
MOOSE RACING
$21.87A quality exhaust gasket kit is critical to maintaining a sealed exhaust system—preventing exhaust leaks that reduce performance and create noise. MOOSE RACING's 823148 kit ensures proper sealing at exhaust manifold and pipe connections, protecting your...09345330- SKU:
- 09345330
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823149
MOOSE RACING
$21.87A leaking exhaust gasket doesn't just waste horsepower—it compromises engine sealing, invites exhaust leaks, and can lead to costly damage if left unaddressed. The MOOSE RACING Exhaust Gasket Kit 823149 delivers OEM-quality sealing with...09345331- SKU:
- 09345331
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823049
MOOSE RACING
$8.13A properly sealed exhaust system is critical to engine performance and longevity—leaks rob you of power, introduce unwanted noise, and allow exhaust gases to escape before your turbo or headers can do their job. The MOOSE RACING Exhaust Gasket Kit 823049...09345275- SKU:
- 09345275
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$8.13 -
MOOSE RACING Exhaust Gasket Kit 823104
MOOSE RACING
$21.48A failed exhaust gasket compromises both performance and reliability, allowing exhaust gases to escape before they reach your system and creating harmful air leaks. MOOSE RACING's Exhaust Gasket Kit 823104 delivers OEM-equivalent sealing with proven...09345303- SKU:
- 09345303
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823107
MOOSE RACING
$21.87A proper exhaust seal is foundational to engine performance and longevity. Worn or degraded gaskets allow exhaust leaks that compromise power output, increase emissions, and can damage surrounding components. The MOOSE RACING Exhaust Gasket Kit 823107...09345306- SKU:
- 09345306
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Ignition Cover Gasket 816356
MOOSE RACING
$10.63An aging or damaged ignition cover gasket can compromise engine sealing and lead to oil seepage that undermines reliability. This MOOSE RACING gasket delivers OEM-equivalent durability at a fraction of OEM pricing, making it an economical choice for...09346541- SKU:
- 09346541
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63 -
MOOSE RACING Ignition Cover Gasket 816024
MOOSE RACING
$7.97A worn or degraded ignition cover gasket compromises engine sealing and can lead to oil leakage, contamination, and potential ignition system failures. The MOOSE Racing Ignition Cover Gasket 816024 delivers OEM-quality sealing with reliable performance...09346919- SKU:
- 09346919
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$7.97 -
MOOSE RACING Valve Shim Kit - 9.48 mm MSEHCSHIM02
MOOSE RACING
$127.95Proper valve shim selection is critical for maintaining correct valve clearance and preventing costly engine damage. This complete kit eliminates guesswork during valve train maintenance, ensuring your engine maintains optimal performance and longevity...09261828- SKU:
- 09261828
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$127.95 -
MOOSE RACING Valve Shim Kit - 10.00 mm MSEHCSHIM31
MOOSE RACING
$109.95Precision valve train maintenance demands reliable, properly-sized shims that you can trust in critical adjustments. The MOOSE RACING Valve Shim Kit eliminates guesswork with laser-etched sizing and forged steel construction that withstands repeated...09261829- SKU:
- 09261829
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- SNOW
$109.95 -
MOOSE RACING Valve Shim - 9.48 x 1.95 - 5 pack MSE5PK948195
MOOSE RACING
$9.95Maintaining proper valve clearance is critical to engine performance and longevity—even a few thousandths of an inch off tolerance can cause valve float, poor sealing, and accelerated wear. These MOOSE RACING valve shims give you the precision adjustment...09261943- SKU:
- 09261943
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Complete Motor Gasket Kit - KDX200 808440
MOOSE RACING
$73.01A complete engine and transmission rebuild requires gaskets and seals that won't fail under stress. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork by bundling every gasket, o-ring, and valve seal needed for a proper bottom-end...M808440- SKU:
- M808440
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- TYPE:
- COMPLETE
$73.01 -
POWERSTANDS RACING Case Saver/Sprocket Cover - Blue 07-04150-25
POWERSTANDS RACING
$99.95A broken chain can transform a routine ride into catastrophic engine damage—and your stock plastic sprocket cover won't stop it. POWERSTANDS Racing's Case Saver replaces that flimsy OEM cover with a precision-machined aluminum shield that absorbs impact...09500788- SKU:
- 09500788
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- CASE SAVER
- PRODUCT NAME:
- SPROCKET COVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
$99.95 -
POWERSTANDS RACING Drain Plug 00-01946-24
POWERSTANDS RACING
$25.95A quality drain plug is essential for maintaining reliable engine oil circulation and preventing catastrophic fluid loss during high-performance driving. The POWERSTANDS RACING drain plug combines precision machining with practical design...09200108- SKU:
- 09200108
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- FEATURES:
- MAGNETIC
- PRODUCT NAME:
- BOLT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL DRAIN
- DIAMETER - THREAD SIZE METRIC:
- M12 X 1.50 X 15 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$25.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4001
MOOSE RACING
$27.95The countershaft sprocket seal is a critical wear component that directly impacts drivetrain reliability and longevity. Factory seals degrade under high heat and aggressive riding, leading to oil leakage and premature bearing failure. This MOOSE RACING...09350428- SKU:
- 09350428
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$27.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4003
MOOSE RACING
$25.95Your countershaft sprocket seal assembly endures constant rotational stress, heat, and contamination—premature wear here cascades into costly drivetrain damage. The MOOSE RACING Countershaft Sprocket Seal Kit delivers OEM-quality components engineered to...09350430- SKU:
- 09350430
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$25.95
