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
$205.60Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081214- 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
$73.24Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$73.24Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$73.24 -
WSM Piston Kit - Sea-Doo - +1 mm 010-815-07K
WSM
$73.24Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$73.24 -
WSM Piston Rings 010-932
WSM
$43.40Order one per cylinder010932- 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
$24.97Order one per cylinder010934- 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
$216.70Can be used with almost all vertical-type single cylinder 2- or 4-stroke motorcycle engines (will not work with lay-down engines/horizontal cylinders), Frame assembles quickly with no tools needed, breaks down in just seconds for compact storage, Swing...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
$27.95Kit includes all of the necessary components to reseal a FCR carburetor at its center section., Components not available from OEM., Kit includes replacement gaskets, O-rings, screws and specialty tool (if necessary)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
$39.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350483- 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
$24.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350484- 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
$35.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350487- 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
$10.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350489- 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
$21.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350490- 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
$18.95Always have the countershaft lock-washers and snap rings on hand for a front sprocket replacement09350491- SKU:
- 09350491
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 10 PACK
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SNAP RING
$18.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4043
MOOSE RACING
$29.95Kits include hardened steel bushing, an upgraded seal, an O-ring (where applicable) and a snap ring or lock washer (where applicable), Made in the U.S.A.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
$29.95Kits include hardened steel bushing, an upgraded seal, an O-ring (where applicable) and a snap ring or lock washer (where applicable), Made in the U.S.A.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
$27.95Kits include hardened steel bushing, an upgraded seal, an O-ring (where applicable) and a snap ring or lock washer (where applicable), Made in the U.S.A.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
$76.95Precision crank bearings, Kits contain right and left crankshaft bearings; 2-stroke kits contain outer seals, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines, 4-stroke crank bearings do not include sealsA241002- 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
$85.95Precision crank bearings, Kits contain right and left crankshaft bearings; 2-stroke kits contain outer seals, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines, 4-stroke crank bearings do not include sealsA241004- 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
$85.95Precision crank bearings, Kits contain right and left crankshaft bearings, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke enginesA241045- 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
