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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WSM Top-End Rebuild Kit - Original Series - 1 mm 010-812-14
WSM
$205.60A top-end rebuild is essential when your engine shows signs of wear—loss of compression, increased blowby, or diminished throttle response. The WSM Original Series Top-End Rebuild Kit delivers OEM-quality components that restore your engine to factory...01081214- SKU:
- 01081214
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 76.00 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
$205.60 -
WSM Piston Kit - Kawasaki - Standard 010-812K
WSM
$73.24If you're rebuilding a Kawasaki engine or replacing worn pistons, you need a kit engineered to handle the demands of high-RPM operation without sacrificing longevity. WSM's piston kit delivers OEM-equivalent quality with performance-enhancing...010812X- SKU:
- 010812X
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 75.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$73.24 -
WSM Piston Kit - Sea-Doo - Standard 010-815K
WSM
$73.24A quality piston kit is the foundation of reliable, high-output engine performance—especially in demanding two-stroke applications where heat and friction directly impact power delivery and component longevity. The WSM Piston Kit for Sea-Doo uses...010815- SKU:
- 010815
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 76.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$73.24Qty in Cart: 0Quantity:Price:$73.24Subtotal: -
WSM Piston Kit - Sea-Doo - +1 mm 010-815-07K
WSM
$73.24When you're pushing your Sea-Doo to the limit, your stock pistons become the weak link in the chain. The WSM Piston Kit delivers OEM-matching quality with engineered upgrades—MOS2 coating on the skirts reduces friction and heat while actually drawing...01081507- SKU:
- 01081507
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE SIZE METRIC:
- 76.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
$73.24Qty in Cart: 0Quantity:Price:$73.24Subtotal: -
WSM Piston Rings 010-932
WSM
$43.40Piston rings are the critical seal between your combustion chamber and crankcase—compromised rings mean blow-by, lost compression, and degraded performance. WSM Piston Rings 010-932 deliver the precision fit and durability needed for sustained high-RPM...010932- SKU:
- 010932
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- UNITS:
- SET
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$43.40 -
WSM Piston Rings 010-934
WSM
$24.97Piston rings are critical to engine sealing and compression—worn or damaged rings lead to blow-by, lost power, and increased oil consumption. WSM Piston Rings 010-934 are precision-engineered to restore factory compression and maintain cylinder sealing...010934- SKU:
- 010934
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$24.97 -
MOTORSPORT PRODUCTS Engine Stand 60-1002
MOTORSPORT PRODUCTS
$216.70Working on motorcycle engines demands the right support—literally. The MOTORSPORT PRODUCTS Engine Stand 60-1002 gives you the stability and flexibility to access every angle of your engine, whether you're performing routine maintenance or a complete...09500869- SKU:
- 09500869
- Availability:
- Ships Same Business Day
- Weight:
- 19.61 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- STAND
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$216.70 -
MOOSE RACING Carb Mid Body Gasket Kit 26-1513
MOOSE RACING
$27.95A leaking FCR carburetor mid-body compromises fuel delivery precision and creates a costly mess in your intake manifold. This complete gasket kit eliminates the need to source components piecemeal from multiple suppliers, giving you everything required...09351013- SKU:
- 09351013
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- CARBURETOR
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6001
MOOSE RACING
$39.95Front sprocket replacement is only half the job—securing the countershaft properly is what separates a reliable setup from a future headache. The MOOSE RACING Washer/Snap Ring Counter Shaft kit ensures your countershaft stays locked in place under load,...09350483- SKU:
- 09350483
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- ATV
- UNITS:
- 10 PACK
- RIDING STYLE:
- OFF-ROAD
$39.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6002
MOOSE RACING
$24.95Front sprocket replacement jobs demand precision fastening to ensure your countershaft stays secure under load and acceleration stress. Keeping MOOSE RACING washer and snap ring sets in your maintenance kit eliminates downtime sourcing individual...09350484- SKU:
- 09350484
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- WASHER
- UNITS:
- 10 PACK
$24.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6005
MOOSE RACING
$35.95Front sprocket replacement requires precision hardware that won't let you down mid-ride. MOOSE RACING's washer and snap ring set ensures your countershaft stays secure and properly seated, eliminating the risk of component slippage or damage during...09350487- SKU:
- 09350487
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- WASHER
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
$35.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6007
MOOSE RACING
$10.95Countershaft fastening components are critical to maintaining proper sprocket alignment and preventing costly drivetrain failures. The MOOSE RACING Washer/Snap Ring Counter Shaft assembly ensures secure retention of your front sprocket during high-RPM...09350489- SKU:
- 09350489
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SNAP RING
- UNITS:
- 10 PACK
$10.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6008
MOOSE RACING
$21.95Front sprocket replacements demand precision hardware—and overlooking the countershaft lock-washers and snap rings is a costly mistake that can lead to sprocket creep, misalignment, and accelerated wear. The MOOSE RACING Washer/Snap Ring Counter Shaft...09350490- SKU:
- 09350490
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 10 PACK
- PRODUCT NAME:
- SNAP RING
- RIDING STYLE:
- STREET
$21.95 -
MOOSE RACING Washer/Snap Ring Counter Shaft 25-6009
MOOSE RACING
$18.95Front sprocket replacements demand precision assembly, and overlooking the countershaft hardware is a costly mistake. The MOOSE RACING Washer/Snap Ring Counter Shaft kit ensures proper sprocket retention and shaft security—critical for maintaining...09350491- SKU:
- 09350491
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 10 PACK
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SNAP RING
$18.95Qty in Cart: 0Quantity:Price:$18.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4043
MOOSE RACING
$29.95A worn countershaft sprocket seal is a direct path to transmission fluid contamination and premature drivetrain wear. This MOOSE RACING kit delivers OEM-quality sealing with hardened steel components engineered to withstand the demands of high-RPM riding...09350845- SKU:
- 09350845
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KLR 25-4039
MOOSE RACING
$29.95A worn countershaft sprocket seal allows oil seepage and contaminants into your drivetrain, compromising performance and longevity. This MOOSE RACING kit delivers OEM-quality sealing with hardened steel components engineered to withstand the demands of...09350846- SKU:
- 09350846
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- APPLICATION:
- COUNTERSHAFT
$29.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4045
MOOSE RACING
$27.95A worn countershaft sprocket seal compromises transmission integrity and allows contamination into critical drivetrain components. This MOOSE RACING kit delivers OEM-quality sealing with upgraded materials, ensuring reliable power delivery and extended...09350847- SKU:
- 09350847
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1002
MOOSE RACING
$76.95A worn or damaged crankshaft bearing assembly compromises engine reliability and performance—especially critical in 2-stroke applications where precision tolerances are non-negotiable. The MOOSE RACING 24-1002 kit delivers OEM-quality bearings with...A241002- SKU:
- A241002
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$76.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1004
MOOSE RACING
$85.95A healthy crankshaft is the foundation of engine reliability, and worn bearings or compromised seals will cost you performance and uptime. The MOOSE RACING 24-1004 Crankcase Bearing and Seal Kit delivers precision-engineered components that restore...A241004- SKU:
- A241004
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- TYPE:
- CRANK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$85.95 -
MOOSE RACING Crank Bearing with Seals - KDX 24-1045
MOOSE RACING
$85.95A worn or damaged crankshaft bearing will compromise engine reliability and performance, leading to costly downtime and potential catastrophic failure in 2-stroke applications. The MOOSE RACING Crank Bearing Kit ensures precise fitment and smooth...A241045- SKU:
- A241045
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- UNITS:
- KIT
- TYPE:
- BALL
$85.95
