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 Case Saver Guard - YZ250F CSG14
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...09500377- SKU:
- 09500377
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- GUARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- NYLON
- TYPE:
- CASE SAVER
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
MOOSE RACING Case Saver Guard - Husqvarna CSG17
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...09500380- SKU:
- 09500380
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- NYLON
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- TYPE:
- CASE SAVER
- RIDING STYLE:
- OFF-ROAD
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
MOOSE RACING Case Saver Guard - KX450F CSG20
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...09500383- SKU:
- 09500383
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NYLON
- PRODUCT NAME:
- GUARD
- TYPE:
- CASE SAVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- RIDING STYLE:
- OFF-ROAD
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - KX125 808423
MOOSE RACING
$55.42Moose 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...M808423- SKU:
- M808423
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$55.42Qty in Cart: 0Quantity:Price:$55.42Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4012
MOOSE RACING
$29.95Kits 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.09350439- SKU:
- 09350439
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Kawasaki 25-4017
MOOSE RACING
$23.95Kits 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.09350443- SKU:
- 09350443
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4044
MOOSE RACING
$29.95Kits 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.09350848- SKU:
- 09350848
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823166
MOOSE RACING
$15.18MOOSE RACING Exhaust Gasket Kit09345347- SKU:
- 09345347
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- EXHAUST
- UNITS:
- KIT
$15.18Qty in Cart: 0Quantity:Price:$15.18Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 2.55 - 5 pack MSE5PK748255
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;...09261885- SKU:
- 09261885
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.55 MM
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821423
MOOSE RACING
$56.48Include 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...09345216- SKU:
- 09345216
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$56.48Qty in Cart: 0Quantity:Price:$56.48Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821545
MOOSE RACING
$50.28Include 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...09345237- SKU:
- 09345237
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$50.28Qty in Cart: 0Quantity:Price:$50.28Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823060
MOOSE RACING
$8.21MOOSE RACING Exhaust Gasket Kit09345280- SKU:
- 09345280
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$8.21 -
MOOSE RACING Exhaust Gasket Kit 823067
MOOSE RACING
$8.21MOOSE RACING Exhaust Gasket Kit09345284- SKU:
- 09345284
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$8.21Qty in Cart: 0Quantity:Price:$8.21Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823070
MOOSE RACING
$8.21MOOSE RACING Exhaust Gasket Kit09345287- SKU:
- 09345287
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- EXHAUST
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$8.21 -
MOOSE RACING Intake Valve Kit M30-32440
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...09262932- SKU:
- 09262932
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- VALVE KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$115.95Qty in Cart: 0Quantity:Price:$115.95Subtotal: -
MOOSE RACING Valve Shim - 9.48 x 3.25 - 5 pack MSE5PK948325
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;...09261969- SKU:
- 09261969
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.25 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Seal Kit M80-82380
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 USA09263200- SKU:
- 09263200
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- TYPE:
- VALVE STEM
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Seal Kit M30-32795
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 USA09263201- SKU:
- 09263201
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- VITON
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- BASE COLOR:
- RED
- TYPE:
- VALVE STEM
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- SEAL KIT
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 1.20 - 5 pack MSE5PK748120
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;...09261858- SKU:
- 09261858
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Water Pump Rebuild Kit 821232
MOOSE RACING
$48.51Include 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...09345180- SKU:
- 09345180
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$48.51Qty in Cart: 0Quantity:Price:$48.51Subtotal:
