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 Crankcase Bearing and Seal Kit 24-1015
MOOSE RACING
$72.95Precision 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 sealsA241015- SKU:
- A241015
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1023
MOOSE RACING
$53.95Precision 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 sealsA241023- SKU:
- A241023
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
- TYPE:
- CRANK
$53.95Qty in Cart: 0Quantity:Price:$53.95Subtotal: -
MOOSE RACING Crank Bearing GAS EC 24-1118
MOOSE RACING
$89.95Precision crank bearings, Kits contain right and left crankshaft bearings, Seals designed with a fluorocarbon lip to reduce dry start friction on 2-stroke engines09240603- SKU:
- 09240603
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- RIDING STYLE:
- STREET
$89.95Qty in Cart: 0Quantity:Price:$89.95Subtotal: -
WSM Piston Kit - Polaris - Standard 010-834K
WSM
$85.08Quality 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...010834- SKU:
- 010834
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 71.30 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$85.08Qty in Cart: 0Quantity:Price:$85.08Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4046
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.09351166- SKU:
- 09351166
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95Qty in Cart: 0Quantity:Price:$27.95Subtotal: -
MOOSE RACING Carb Mid Body Gasket Kit 26-10014
MOOSE RACING
$18.95Kit 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)09351169- SKU:
- 09351169
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CARBURETOR
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$18.95Qty in Cart: 0Quantity:Price:$18.95Subtotal: -
VESRAH Complete Gasket Kit - CR 125 VG-1020
VESRAH
$52.75Complete Gasket Sets VG1020 Comprehensive engine rebuild solution with all essential gaskets. Includes o-rings and valve guide oil seals for optimal performance. Top-end gasket sets designed for efficient top-end rebuilds. Sold...VG1020- SKU:
- VG1020
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- SET
$52.75Qty in Cart: 0Quantity:Price:$52.75Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816753
MOOSE RACING
$42.59Moose can now handle all your gasket and seal needs at a fraction of OEM cast, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmissions with total confidence as each set is designed for durability and...09346168- SKU:
- 09346168
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$42.59Qty in Cart: 0Quantity:Price:$42.59Subtotal: -
MOOSE RACING Magnetic Drain Plug DP127
MOOSE RACING
$23.95Made from 7075 lightweight aluminum, Prolong engine life by pulling metal filings out of the oil, Ultra-powerful magnets, Come with either O-ring or washer sealing surface, Compare with original OEM plug before installing, Made in the U.S.A.09200054- SKU:
- 09200054
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- DIAMETER - THREAD SIZE METRIC:
- M14 X 1.50 X 13 MM
- FEATURES:
- MAGNETIC
- MATERIAL:
- 7075 ALUMINUM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6001
MOOSE RACING
$36.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500760- SKU:
- 09500760
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6003
MOOSE RACING
$34.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500762- SKU:
- 09500762
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6014
MOOSE RACING
$72.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500899- SKU:
- 09500899
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6015
MOOSE RACING
$73.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500900- SKU:
- 09500900
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
$73.95Qty in Cart: 0Quantity:Price:$73.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit - KTM 18-6005
MOOSE RACING
$41.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500764- SKU:
- 09500764
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$41.95Qty in Cart: 0Quantity:Price:$41.95Subtotal: -
On Sale
VESRAH Complete Gasket Kit - KLT/KZ200 VG-440
VESRAH
MSRP: $50.95Now: $34.00Was: $50.95Complete Gasket Sets VG440 Includes all essential engine gaskets for a complete rebuild. Contains o-rings and valve guide oil seals for optimal performance. Top-end gasket sets available for focused top-end rebuilds. Sold individually...VG440- SKU:
- VG440
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
MSRP: $50.95Now: $34.00Was: $50.95Qty in Cart: 0Quantity:Price:MSRP: $50.95Now: $34.00Was: $50.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-810-12
WSM
$240.24Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081012- SKU:
- 01081012
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 76.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
$240.24Qty in Cart: 0Quantity:Price:$240.24Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-812-12
WSM
$195.81Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081212- SKU:
- 01081212
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
$195.81Qty in Cart: 0Quantity:Price:$195.81Subtotal: -
WSM Piston Kit - Sea-Doo - +.50 mm 010-816-05K
WSM
$76.57Quality 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...01081605- SKU:
- 01081605
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 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:
- 78.00 MM
$76.57Qty in Cart: 0Quantity:Price:$76.57Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-820-10
WSM
$221.36Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01082010- SKU:
- 01082010
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 80.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
$221.36Qty in Cart: 0Quantity:Price:$221.36Subtotal: -
WSM Piston Kit - Kawasaki - Standard 010-821K
WSM
$85.08Quality 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...010821- SKU:
- 010821
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$85.08Qty in Cart: 0Quantity:Price:$85.08Subtotal:
