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 Ring Set - For 78 mm Piston CP7800C
MOOSE RACING
$35.95Made in the U.S.A., Be sure to use race fuel with some applications09120239- SKU:
- 09120239
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- SET
$35.95 -
MOOSE RACING Ring Set - For 66 mm Piston CP6600C
MOOSE RACING
$35.95Made in the U.S.A., Be sure to use race fuel with some applications09120240- SKU:
- 09120240
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- PISTON SIZE METRIC:
- STANDARD
$35.95 -
MOOSE RACING Ring Set - For 77 mm Piston CP7700C
MOOSE RACING
$35.95Made in the U.S.A., Be sure to use race fuel with some applications09120241- SKU:
- 09120241
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$35.95 -
MOOSE RACING Ring Set - For 95 mm Piston CPN2-3740
MOOSE RACING
$35.95Made in the U.S.A., Be sure to use race fuel with some applications09120244- SKU:
- 09120244
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- SET
$35.95 -
MOOSE RACING Piston Kit - 44.97 mm MSE23430CD
MOOSE RACING
$62.95Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life, Coated skirts ease break-in, decreasing wear and aiding in lubrication, Wear-resistant piston rings, Wrist...09102717- SKU:
- 09102717
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.97 MM
- RIDING STYLE:
- OFF-ROAD
$62.95 -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1006
MOOSE RACING
$62.95Precision 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 sealsA241006- SKU:
- A241006
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CRANK
$62.95 -
MOOSE RACING Valve Shim - 7.48 x 2.15 - 5 pack MSE5PK748215
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;...09261877- SKU:
- 09261877
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- VALVE SHIM THICKNESS METRIC:
- 2.15 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Seal Kit M80-80710
MOOSE RACING
$19.95Contact surfaces designed for improved sealing, High-temperature Viton® and PTFE materials, Improved tolerance over OEM, 100% quality controlled, Kits include one full set of intake and exhaust seals, Made in the USA09262831- SKU:
- 09262831
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- VITON
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- TYPE:
- VALVE STEM
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
$19.95 -
MOOSE RACING Valve Seal Kit M80-80890
MOOSE RACING
$15.95Contact surfaces designed for improved sealing, High-temperature Viton® and PTFE materials, Improved tolerance over OEM, 100% quality controlled, Kits include one full set of intake and exhaust seals, Made in the USA09262833- SKU:
- 09262833
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ATV
$15.95 -
MOOSE RACING Valve Seal Kit M80-80990
MOOSE RACING
$15.95Contact surfaces designed for improved sealing, High-temperature Viton® and PTFE materials, Improved tolerance over OEM, 100% quality controlled, Kits include one full set of intake and exhaust seals, Made in the USA09262834- SKU:
- 09262834
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- BASE COLOR:
- RED
- MATERIAL:
- VITON
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Intake Valve Kit M80-80950
MOOSE RACING
$307.95Stainless 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...09262459- SKU:
- 09262459
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- KIT
$307.95 -
MOOSE RACING Connecting Rod MR5399
MOOSE RACING
$474.95Moose Racing has teamed up with CP-Carrillo to bring you the highest quality, professional connecting rod, 100% machined from an oversized forging ensures proper grain flow and consistency through the manufacturing process, Made from proprietary material...09230306- SKU:
- 09230306
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- STYLE:
- HIGH PERFORMANCE
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- PROPRIETARY ALLOY
- PRODUCT NAME:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
$474.95 -
MOOSE RACING Connecting Rod MR9903
MOOSE RACING
$474.95Moose Racing has teamed up with CP-Carrillo to bring you the highest quality, professional connecting rod, 100% machined from an oversized forging ensures proper grain flow and consistency through the manufacturing process, Made from proprietary material...09230307- SKU:
- 09230307
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- CONNECTING ROD
- STYLE:
- HIGH PERFORMANCE
- MATERIAL:
- PROPRIETARY ALLOY
- RIDING STYLE:
- OFF-ROAD
$474.95 -
MOOSE RACING Top End Gasket Kit - KX 250 810457
MOOSE RACING
$45.89Moose 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...M810457- SKU:
- M810457
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$45.89 -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 8080027
MOOSE RACING
$110.43Moose 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...09346438- SKU:
- 09346438
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$110.43 -
MOOSE RACING Complete Motor Gasket Kit - Honda CRF250 8080030
MOOSE RACING
$204.56Moose 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...09346439- SKU:
- 09346439
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$204.56 -
MOOSE RACING Complete Motor Gasket Kit - Honda CRF450 8080034
MOOSE RACING
$131.46Moose 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...09346440- SKU:
- 09346440
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$131.46 -
MOOSE RACING Top End Gasket Kit - Honda 8100028
MOOSE RACING
$56.32Moose 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...09346446- SKU:
- 09346446
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- TYPE:
- TOP END
$56.32 -
MOOSE RACING Complete Motor Gasket Kit without Seals 8110028
MOOSE RACING
$135.61Moose 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...09346451- SKU:
- 09346451
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$135.61 -
MOOSE RACING Complete Motor Gasket Kit without Seals - YZ250 8110029
MOOSE RACING
$165.87Moose 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...09346452- SKU:
- 09346452
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$165.87
