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 24-1009
MOOSE RACING
$93.95A worn crankshaft bearing or degraded seal will accelerate internal engine wear and compromise power delivery—especially critical for 2-stroke engines where lubrication tolerance is razor-thin. The...A241009- SKU:
- A241009
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$93.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1014
MOOSE RACING
$69.95Your crankshaft bearings are the foundation of engine reliability—worn or inadequate bearings lead to excessive play, bearing knock, and catastrophic engine failure. The MOOSE RACING Crankcase...A241014- SKU:
- A241014
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$69.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1015
MOOSE RACING
$72.95A worn or damaged crankshaft bearing will quickly cascade into catastrophic engine failure—seized cranks, metal debris in your oil, and a destroyed bottom end. The MOOSE RACING 24-1015 kit gives you...A241015- 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
$53.95A worn or failing crankshaft bearing assembly forces your engine to work harder, accelerates wear on adjacent components, and ultimately compromises reliability when you need it most. The MOOSE...A241023- 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
$89.95Crankshaft bearing failure is one of the quickest ways to end a race day—or destroy an engine. The MOOSE RACING Crank Bearing GAS EC 24-1118 delivers precision-engineered bearings with fluorocarbon...09240603- SKU:
- 09240603
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- RIDING STYLE:
- STREET
$89.95 -
WSM Piston Kit - Polaris - Standard 010-834K
WSM
$85.08Piston failure under load is one of the costliest failures in high-performance engines. The WSM Piston Kit delivers OEM-quality construction with measurable improvements in heat management and ring...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
$27.95A worn countershaft sprocket seal compromises engine performance and accelerates drivetrain wear on your Kawasaki. This MOOSE RACING kit delivers OEM-quality sealing with upgraded components...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
$18.95Carburetor sealing degradation compromises fuel atomization and creates lean-running conditions that tank performance and reliability. This complete gasket and O-ring kit restores FCR carb integrity...09351169- SKU:
- 09351169
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CARBURETOR
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$18.95 -
On Sale
VESRAH Complete Gasket Kit - CR 125 VG-1020
VESRAH
MSRP: $52.75Now: $50.11Was: $52.75Engine gasket failure compromises compression, causes oil leaks, and forces costly rebuilds. The VESRAH VG-1020 Complete Gasket Kit delivers all critical sealing components in one comprehensive...VG1020- SKU:
- VG1020
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- SET
MSRP: $52.75Now: $50.11Was: $52.75Qty in Cart: 0Quantity:Price:MSRP: $52.75Now: $50.11Was: $52.75Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816753
MOOSE RACING
$42.59A leaking clutch cover gasket compromises both performance and engine longevity—oil seepage leads to contamination and potential clutch slippage. The MOOSE RACING Inner Clutch Cover Gasket delivers...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
$23.95Metal particles naturally accumulate in your engine oil during normal operation—wear debris that can accelerate bearing damage and reduce engine longevity. The MOOSE RACING Magnetic Drain Plug DP127...09200054- SKU:
- 09200054
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 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
$23.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6001
MOOSE RACING
$36.95A leaking slave cylinder compromises brake feel and system reliability—exactly what you can't afford on track or in the shop. This MOOSE RACING rebuild kit delivers a complete seal solution with...09500760- SKU:
- 09500760
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 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
$34.95A leaking slave cylinder compromises braking feel and can leave you stranded trackside or roadside. This MOOSE RACING rebuild kit restores your hydraulic clutch or brake system to factory...09500762- 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
$75.95A leaking slave cylinder compromises brake feel and can leave you stranded trackside or on the street. This MOOSE RACING rebuild kit supplies all necessary seals, O-rings, and hardware to restore...09500899- 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
$75.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6015
MOOSE RACING
$73.95Slave cylinder leaks compromise braking performance and safety—this rebuild kit gets your hydraulic system back to OEM specifications without replacing the entire cylinder. Whether you're running a...09500900- 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
$41.95A leaking slave cylinder compromises brake feel, safety, and overall system reliability—especially critical in racing or high-performance applications where precise modulation is non-negotiable. This...09500764- SKU:
- 09500764
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$41.95Qty in Cart: 0Quantity:Price:$41.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-810-12
WSM
$240.24A top-end rebuild demands precision components that restore your engine to factory specifications—or exceed them. The WSM Top-End Rebuild Kit supplies every critical component needed for a complete...01081012- 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
$195.81A top-end rebuild demands precision components that restore your engine to OEM specifications or beyond. The WSM Original Series kit delivers complete piston assembly hardware in one package,...01081212- 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
$76.57Sea-Doo pistons experience extreme heat and pressure during extended operation, making OEM-quality replacements essential for maintaining peak performance and engine longevity. The WSM Piston Kit...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
$221.36A top-end rebuild is fundamental to restoring compression, sealing, and combustion efficiency in high-revving engines. This WSM kit delivers OEM-quality components engineered to tight tolerances,...01082010- 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:
