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 Complete Motor Gasket Kit - CR85R 808211
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...09340265- SKU:
- 09340265
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$55.42 -
MOOSE RACING Motor Gasket Kit with Seal - YZ/WR400 811675
MOOSE RACING
$140.18Moose 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...09341486- SKU:
- 09341486
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$140.18Qty in Cart: 0Quantity:Price:$140.18Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - Husqvarna/KTM 811365
MOOSE RACING
$165.56Moose 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...09344789- SKU:
- 09344789
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$165.56Qty in Cart: 0Quantity:Price:$165.56Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - KDX200 808440
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...M808440- SKU:
- M808440
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- TYPE:
- COMPLETE
$69.27Qty in Cart: 0Quantity:Price:$69.27Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - RM250 808593
MOOSE RACING
$106.67Moose 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...09340974- SKU:
- 09340974
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$106.67 -
POWERSTANDS RACING Case Saver/Sprocket Cover - Blue 07-04150-25
POWERSTANDS RACING
$99.95Tough protection against broken chain from cracking engine cases, Machined lightweight design, Look so much better than stock cover, Replace OEM plastic sprocket cover, Anodized finish09500788- SKU:
- 09500788
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- CASE SAVER
- PRODUCT NAME:
- SPROCKET COVER
- TYPE:
- ENGINE
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
$99.95Qty in Cart: 0Quantity:Price:$99.95Subtotal: -
POWERSTANDS RACING Drain Plug 00-01946-24
POWERSTANDS RACING
$25.95Bolts are CNC machined from high-quality aluminum, Embedded magnet helps keep bolt in place, Predrilled holes make for easy installation of safety wires09200108- SKU:
- 09200108
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- RED
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- FEATURES:
- MAGNETIC
- PRODUCT NAME:
- BOLT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL DRAIN
- DIAMETER - THREAD SIZE METRIC:
- M12 X 1.50 X 15 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
On Sale
Pro Circuit Water Pump Cover with Impeller for Honda CRF450R 2019 WPH09450
PRO CIRCUIT
MSRP: $239.95Now: $211.16Was: $239.95Upgrade your Honda's performance with the PRO CIRCUIT Water Pump Cover, expertly crafted from CNC-machined billet aluminum. This cover not only enhances durability but also optimizes water flow, ensuring your engine runs cooler and more efficiently...09401180- SKU:
- 09401180
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- MACHINED
- TYPE:
- WATER PUMP
- UNITS:
- SET
MSRP: $239.95Now: $211.16Was: $239.95Qty in Cart: 0Quantity:Price:MSRP: $239.95Now: $211.16Was: $239.95Subtotal: -
On Sale
Pro Circuit Water Pump Cover with Impeller for 2004-2006 Suzuki RM-Z250 WPK04250
PRO CIRCUIT
MSRP: $239.95Now: $211.16Was: $239.95Enhance your engine's cooling efficiency with the PRO CIRCUIT Water Pump Cover, expertly crafted from CNC-machined billet aluminum. This robust yet lightweight design ensures exceptional durability, delivering superior protection and performance for your...09400464- SKU:
- 09400464
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- COVER
- TYPE:
- WATER PUMP
- COLOR/FINISH:
- MACHINED
- UNITS:
- SET
MSRP: $239.95Now: $211.16Was: $239.95Qty in Cart: 0Quantity:Price:MSRP: $239.95Now: $211.16Was: $239.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4001
MOOSE RACING
$27.95Kits 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.09350428- SKU:
- 09350428
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$27.95Qty in Cart: 0Quantity:Price:$27.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4003
MOOSE RACING
$25.95Kits 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.09350430- SKU:
- 09350430
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - KTM 25-4006
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.09350433- SKU:
- 09350433
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4023
MOOSE RACING
$22.95Kits 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.09350448- SKU:
- 09350448
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$22.95Qty in Cart: 0Quantity:Price:$22.95Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KTM 811371
MOOSE RACING
$100.14Moose 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...09345367- SKU:
- 09345367
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$100.14 -
MOOSE RACING Valve Shim - 8.90 x 2.28 - 5 pack MSE5PK890228
MOOSE RACING
$10.95Complete 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;...09261919- SKU:
- 09261919
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.28 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 2.48 - 5 pack MSE5PK890248
MOOSE RACING
$10.95Complete 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;...09261924- SKU:
- 09261924
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- VALVE SHIM THICKNESS METRIC:
- 2.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Head Cover Gasket - Yamaha 817944
MOOSE RACING
$25.22Moose 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...09346181- SKU:
- 09346181
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- GASKET
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- VALVE COVER
- UNITS:
- EACH
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
$25.22 -
MOOSE RACING Ignition Cover Gasket 816177
MOOSE RACING
$10.55Made in the U.S.A.09346934- SKU:
- 09346934
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$10.55Qty in Cart: 0Quantity:Price:$10.55Subtotal: -
MOOSE RACING Cam Chain 250-8136
MOOSE RACING
$4.95Made from the highest-quality select steel alloys, Lightweight and great durability, Feature precision solid bushings and shot-peened, providing maximum strength, Made to meet or exceed OEM standards09250819- SKU:
- 09250819
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- OFF-ROAD
- BASE FINISH:
- RAW
- CHAIN SIZE:
- 82RH2015
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- MATERIAL:
- STEEL
- NUMBER OF LINKS:
- 124
- MODEL:
- SILENT
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
$4.95Qty in Cart: 0Quantity:Price:$4.95Subtotal: -
MOOSE RACING Case Saver Guard - CRF150 CSG12
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...09500375- SKU:
- 09500375
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- RED
- TYPE:
- CASE SAVER
- MATERIAL:
- NYLON
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal:
