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 Crankcase Bearing and Seal Kit 24-1003
MOOSE RACING
$77.95Precision 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 sealsA241003- SKU:
- A241003
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
- PRODUCT NAME:
- BEARING KIT
- UNITS:
- KIT
$77.95Qty in Cart: 0Quantity:Price:$77.95Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821585
MOOSE RACING
$76.89Include every gasket, O-ring, bearing and seal required to rebuild a water pump, Typical kit includes the following: bearings where applicable; rubber seals; mechanical water pump seal where applicable; side cover gasket; water pump gasket; snap rings...09345245- SKU:
- 09345245
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REPAIR KIT
$76.89Qty in Cart: 0Quantity:Price:$76.89Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823148
MOOSE RACING
$21.87MOOSE RACING Exhaust Gasket Kit09345330- SKU:
- 09345330
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823149
MOOSE RACING
$21.87MOOSE RACING Exhaust Gasket Kit09345331- SKU:
- 09345331
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823049
MOOSE RACING
$8.13MOOSE RACING Exhaust Gasket Kit09345275- SKU:
- 09345275
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$8.13Qty in Cart: 0Quantity:Price:$8.13Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823104
MOOSE RACING
$21.48MOOSE RACING Exhaust Gasket Kit09345303- SKU:
- 09345303
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$21.48 -
MOOSE RACING Exhaust Gasket Kit 823107
MOOSE RACING
$21.87MOOSE RACING Exhaust Gasket Kit09345306- SKU:
- 09345306
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$21.87 -
MOOSE RACING Gasket - Top End - YZ250F 8100025
MOOSE RACING
$78.88Moose 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...09346583- SKU:
- 09346583
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$78.88Qty in Cart: 0Quantity:Price:$78.88Subtotal: -
MOOSE RACING Ignition Cover Gasket 816356
MOOSE RACING
$10.63Moose 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, These...09346541- SKU:
- 09346541
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
$10.63 -
MOOSE RACING Ignition Cover Gasket 816024
MOOSE RACING
$7.97Made in the U.S.A.09346919- SKU:
- 09346919
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$7.97 -
MOOSE RACING Head Cover Gasket - KTM 817893
MOOSE RACING
$18.93Moose 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...09346971- SKU:
- 09346971
- Availability:
- Ships Same Business Day
- Weight:
- 1.64 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$18.93 -
MOOSE RACING Intake Valve Kit M96-96450
MOOSE RACING
$217.95Stainless steel conversion kits include only what’s needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts, Valves...09262467- SKU:
- 09262467
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95Qty in Cart: 0Quantity:Price:$217.95Subtotal: -
MOOSE RACING Cylinder - Standard - Honda MSE10010
MOOSE RACING
$390.95Replace your damaged or worn OEM cylinder, Made from cast aluminum; nickel silicon carbide plated, Precision-machined and honed to OEM stock bore sizes, Extremely durable low-friction bore surface allows for greater heat dissipation, Stock OEM...09310972- SKU:
- 09310972
- Availability:
- Ships Same Business Day
- Weight:
- 3.11 LBS
- BORE SIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- GRAY
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$390.95 -
MOOSE RACING Valve and Spring Kit M30-32450
MOOSE RACING
$115.95Stainless steel conversion kits include only what’s needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts, Valves...09262933- SKU:
- 09262933
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
$115.95Qty in Cart: 0Quantity:Price:$115.95Subtotal: -
MOOSE RACING Valve Shim Kit - 9.48 mm MSEHCSHIM02
MOOSE RACING
$127.95Complete valve shim kits make it easier to maintain your valve train, Forged from 4140 cold rolled steel, not sintered, Laser-etched size on each shim for identification, A great addition to any mechanic's tool box, Refills sold to dealers in 5-packs;...09261828- SKU:
- 09261828
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
MOOSE RACING Valve Shim Kit - 10.00 mm MSEHCSHIM31
MOOSE RACING
$109.95Complete valve shim kits make it easier to maintain your valve train, Forged from 4140 cold rolled steel, not sintered, Laser-etched size on each shim for identification, A great addition to any mechanic's tool box, Refills sold to dealers in 5-packs;...09261829- SKU:
- 09261829
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- SNOW
$109.95Qty in Cart: 0Quantity:Price:$109.95Subtotal: -
MOOSE RACING Valve Shim - 9.48 x 1.95 - 5 pack MSE5PK948195
MOOSE RACING
$9.95Complete valve shim kits make it easier to maintain your valve train, Forged from 4140 cold rolled steel, not sintered, Laser-etched size on each shim for identification, A great addition to any mechanic's tool box, Refills sold to dealers in 5-packs;...09261943- SKU:
- 09261943
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Slave Cylinder Rebuild Kit 18-6000
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 screws09500759- SKU:
- 09500759
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- SLAVE CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
MOOSE RACING Case Saver Guard - KX250F CSG19
MOOSE RACING
$37.95Made out of a highly durable, high-temperature, impact-resistant nylon, Offers you the protection you're looking for like no other, This slim design eliminates the bulky stock cover feel and offers more protection as well, Come in black with anodized red...09500382- SKU:
- 09500382
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- CASE SAVER
- MATERIAL:
- NYLON
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
MOOSE RACING Clutch Cylinder Guard - 350SX 13-100
MOOSE RACING
$42.95CNC-machined aluminum is black anodized and contrast cut for stylish, functional protection, Specialized applications guard hydraulic clutch cylinders and feature knockdown bars to keep your chain in check, Mounting hardware included, Made in the U.S.A.09500371- SKU:
- 09500371
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal:
