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
-
MOOSE RACING Motor Gasket Kit with Seal - RM125 811550
MOOSE RACING
$97.43Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, Sets include...09340488- SKU:
- 09340488
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$97.43 -
MOOSE RACING Complete Motor Gasket Kit - TTR125 808640
MOOSE RACING
$69.27Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340489- SKU:
- 09340489
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$69.27 -
MOOSE RACING Motor Gasket Kit with Seal - TTR125 811640
MOOSE RACING
$84.07Moose can now handle all your gasket and seal needs at a fraction of OEM cost, Rebuild the engine and transmission with total confidence as each set is designed for durability and accurate fit, Oil seals are genuine OEM replacement seals, Sets include...09340490- SKU:
- 09340490
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$84.07 -
MOOSE RACING Top End Gasket Kit - YZ125 810641
MOOSE RACING
$26.66Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09340491- SKU:
- 09340491
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$26.66 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6012
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 screws09500897- SKU:
- 09500897
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
$73.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6013
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 screws09500898- SKU:
- 09500898
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- STREET
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
MOOSE RACING Slave Cylinder Rebuild Kit - KTM 18-6004
MOOSE RACING
$44.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500763- SKU:
- 09500763
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- KIT
$44.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6006
MOOSE RACING
$44.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500765- SKU:
- 09500765
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
$44.95 -
MOOSE RACING Slave Cylinder Rebuild Kit - KTM 18-6008
MOOSE RACING
$44.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500767- SKU:
- 09500767
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$44.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6009
MOOSE RACING
$44.95Kit contains all of the components to re-seal leaking slave cylinder, Kit includes copper washer, seal, O-rings, gaskets, spring and screws09500768- SKU:
- 09500768
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- SLAVE CYLINDER
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$44.95 -
WSM Rotary Valve Gear 010-450
WSM
$43.10Gear for Sea-Doo rotary valves010450- SKU:
- 010450
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GEAR
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ROTARY VALVE
$43.10 -
WSM Rotary Valve Shaft 010-455
WSM
$82.80Rotary Valve Shaft for Sea-Doo models010455- SKU:
- 010455
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ROTARY VALVE
- UNITS:
- EACH
$82.80 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-802-10
WSM
$236.07Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01080210- SKU:
- 01080210
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 77.00 MM
- MODEL:
- ORIGINAL SERIES
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
$236.07 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-802-12
WSM
$236.07Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01080212- SKU:
- 01080212
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- BORE SIZE METRIC:
- 77.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
$236.07 -
WSM Piston Kit - Kawasaki - Standard 010-810K
WSM
$82.17Quality 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...010810- SKU:
- 010810
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 76.00 MM
- PISTON MATERIAL:
- ALUMINUM
$82.17Qty in Cart: 0Quantity:Price:$82.17Subtotal: -
WSM Piston Kit - Kawasaki - +.25 mm 010-810-04K
WSM
$82.17Quality 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...01081004- SKU:
- 01081004
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 76.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$82.17 -
WSM Piston Kit - Kawasaki 650 - +.5 mm 010-810-05K
WSM
$82.17Quality 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...01081005- SKU:
- 01081005
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 76.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
$82.17 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-810-10
WSM
$240.24Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081010- SKU:
- 01081010
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 76.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- UNITS:
- EACH
$240.24 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-810-14
WSM
$240.24Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081014- SKU:
- 01081014
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 77.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$240.24 -
WSM Piston Kit - Kawasaki 550 - +.5 mm 010-812-05K
WSM
$77.84Quality 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...01081205- SKU:
- 01081205
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
$77.84
