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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WINDEROSA Oil Seal - WaveRunner 622117
WINDEROSA
$26.53Oil seals are critical to engine longevity—they prevent fluid leakage that compromises bearing lubrication and engine performance. The WINDEROSA Oil Seal (622117) is engineered to maintain a tight barrier in your WaveRunner, protecting against coolant...09351110- SKU:
- 09351110
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$26.53 -
WORKS CONNECTION Aluminum Oil Filler Plug - Red 24-001
WORKS CONNECTION
$32.95Stock plastic oil filler plugs are prone to cracking, stripping, and leaking—especially under high RPM or extreme engine temperatures. The WORKS CONNECTION aluminum oil filler plug eliminates these failure points with a precision-machined component that...09500056- SKU:
- 09500056
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE FINISH:
- ANODIZED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
- BASE COLOR:
- RED
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
WORKS CONNECTION Oil Fill Plug - Green 24-198
WORKS CONNECTION
$32.95Stock plastic oil fill plugs are prone to cracking under thermal stress and vibration—especially in high-performance or track applications. The WORKS CONNECTION Oil Fill Plug replaces that weak point with a precision-machined aluminum component that...09500608- SKU:
- 09500608
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- BASE COLOR:
- GREEN
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- GREEN
- MATERIAL:
- 6061 T-6 ALUMINUM
- PRODUCT NAME:
- PLUG
- TYPE:
- OIL FILLER
- RIDING STYLE:
- ATV
$32.95 -
WSM Piston Kit - K1100 - +.25 mm 010-821-04PK
WSM
$98.28High-performance pistons are the foundation of reliable power delivery under sustained boost and RPM, and OEM units often compromise on thermal management and durability. The WSM K1100 Piston Kit delivers OEM-equivalent construction with purposeful...01082104P- SKU:
- 01082104P
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$98.28 -
WSM Piston Kit - K1100 - +.5 mm 010-821-05PK
WSM
$93.60Whether you're chasing tighter tolerances in a rebuild or maximizing power output in a high-revving engine, OEM pistons often fall short of what serious builders demand. The WSM Piston Kit delivers OEM-matching quality with purposeful...01082105P- SKU:
- 01082105P
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.00 MM
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$93.60Qty in Cart: 0Quantity:Price:$93.60Subtotal: -
VESRAH Complete Gasket Kit - KE/KV 100 VG-444
VESRAH
$31.49Engine gasket failure leads to oil leaks, compression loss, and catastrophic damage—often at the worst possible moment. The VESRAH VG-444 Complete Gasket Kit eliminates guesswork during top-end rebuilds by supplying every critical seal your KE/KV 100...VG444- SKU:
- VG444
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$31.49Qty in Cart: 0Quantity:Price:$31.49Subtotal: -
VESRAH Complete Gasket Kit - DT100 VG-292
VESRAH
$26.36Engine gasket failure doesn't just leak—it compromises compression, contaminates your oil, and forces you back into the shop. The VESRAH Complete Gasket Kit VG-292 provides all the sealing components needed for a thorough engine rebuild, ensuring your...VG292- SKU:
- VG292
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- UNITS:
- SET
- TYPE:
- COMPLETE
$26.36 -
BOYESEN Ignition Cover - Black - KTM SX SC-41AB
BOYESEN
$87.95The factory appearance of a professional-grade ignition cover matters when you're serious about your machine. This Boyesen cover seals properly to keep dirt and water out of your engine's internals—protecting your investment and maintaining reliability...09401266- SKU:
- 09401266
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- MATERIAL:
- ALUMINUM
- MODEL:
- FACTORY RACING
- COLOR/FINISH:
- POWDER-COATED
- UNITS:
- EACH
$87.95 -
BOYESEN Ignition Cover - Gold - CR125 SC-01AM
BOYESEN
$87.95A quality ignition cover isn't just about aesthetics—it's critical engine protection. The Boyesen Factory Ignition Cover seals out dirt and water that can compromise internal components, while its premium aluminum construction and powder-coated finish...09400209- SKU:
- 09400209
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- COVER
- TYPE:
- IGNITION
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- MAGNESIUM
- MATERIAL:
- ALUMINUM
$87.95 -
BOYESEN Replacement Gasket - KTM CCG-44A
BOYESEN
$7.00A worn or compromised clutch cover gasket is a direct path to oil leaks and reduced clutch performance on your KTM. The BOYESEN CCG-44A replacement gasket eliminates the weak point in your factory seal with precision engineering and premium materials,...09343125- SKU:
- 09343125
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$7.00 -
HOT RODS Crankshaft Assembly 4014
HOT RODS
$305.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft Assembly 4014 delivers the durability and precision you need without the machine work. This complete, factory-assembled unit meets or exceeds OEM specifications, saving you...H117- SKU:
- H117
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
$305.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0006
HOT RODS
$34.95A leaking or failing water pump can quickly escalate into catastrophic engine damage, making timely repairs critical for both track and street applications. This HOT RODS repair kit supplies all internal components needed to restore OEM-level cooling...09342918- SKU:
- 09342918
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0007
HOT RODS
$63.95A leaking or failing water pump can quickly turn a reliable engine into an unreliable liability. This repair kit gives you the precision components—bearings, seals, and gaskets—needed to restore your Honda's cooling system to OEM specifications without...09342919- SKU:
- 09342919
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$63.95Qty in Cart: 0Quantity:Price:$63.95Subtotal: -
HOT RODS Water Pump Repair Kit - Honda WPK0008
HOT RODS
$54.95A leaking or failing water pump can quickly escalate from a minor inconvenience to catastrophic engine damage, especially under racing conditions or sustained high-performance driving. This repair kit delivers OEM-equivalent components—precision...09342920- SKU:
- 09342920
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$54.95 -
HOT RODS Crankshaft Assembly 4032
HOT RODS
$476.95If you're building a high-performance ATV engine or refreshing a tired bottom end, the HOT RODS Crankshaft Assembly 4032 delivers factory-proven reliability without the machine work. This complete, pre-trued assembly arrives ready to install, eliminating...H121- SKU:
- H121
- Availability:
- Ships Same Business Day
- Weight:
- 6.56 LBS
- COLOR/FINISH:
- STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$476.95 -
HOT RODS Crank Bearings K085
HOT RODS
$212.95A crankshaft is only as reliable as its bearings—and the HOT RODS K085 Crank Bearing Kit delivers the precision fit and durability required for high-RPM performance. These main bearing and seal kits are engineered to work seamlessly with HOT RODS...09240373- SKU:
- 09240373
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$212.95Qty in Cart: 0Quantity:Price:$212.95Subtotal: -
HOT RODS Crankshaft 4095
HOT RODS
$397.95If you're building a long-stroke engine for your ATV, you need a crankshaft engineered to handle the increased demands of extended stroke geometry. The HOT RODS Crankshaft 4095 arrives factory-assembled and trued to OEM specifications, eliminating the...09210215- SKU:
- 09210215
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 250 CC
- MODEL:
- 4-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 52.20 MM
$397.95 -
HOT RODS Crankshaft Kit CBK0119
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic, you need a crankshaft assembly that's manufactured to exacting standards and ready to handle increased displacement or RPM. The HOT RODS Crankshaft Kit CBK0119 comes factory-assembled...09210356- SKU:
- 09210356
- Availability:
- Ships Same Business Day
- Weight:
- 9.00 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$595.95 -
HOT RODS Crankshaft Kit CBK0120
HOT RODS
$993.95The HOT RODS Crankshaft Kit CBK0120 delivers factory-spec performance with the durability of a purpose-built racing component. Whether you're rebuilding after catastrophic failure or upgrading for increased displacement, this complete assembly eliminates...09210357- SKU:
- 09210357
- Availability:
- Ships Same Business Day
- Weight:
- 13.65 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$993.95 -
HOT RODS Crankshaft Kit CBK0124
HOT RODS
$768.95If you're building a high-performance engine or refreshing a tired crankshaft, the HOT RODS Crankshaft Kit CBK0124 delivers factory-matched reliability with performance that meets or exceeds OEM specifications. This complete assembly arrives...09210358- SKU:
- 09210358
- Availability:
- Ships Same Business Day
- Weight:
- 13.08 LBS
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- UNITS:
- KIT
$768.95
