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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JAGG OIL COOLERS Thermostat Service Kit AK4700-T
JAGG OIL COOLERS
$37.95Service kit to replace thermostat by-pass element in Jagg 4700 Offset Oil Filter Adapter07130216- SKU:
- 07130216
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- THERMOSTAT
- TYPE:
- OIL COOLER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$37.95 -
JAGG OIL COOLERS By-Pass Valve Service Kit SK4050-T
JAGG OIL COOLERS
$29.95Proper oil temperature management is critical for engine longevity and performance, especially in variable weather conditions. The JAGG SK4050-T by-pass valve gives you precise thermal control by allowing oil to bypass the cooler during cold starts or...07130219- SKU:
- 07130219
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BYPASS VALVE
- TYPE:
- AUTOMATIC
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$29.95 -
JAGG OIL COOLERS 180 Degree Preset Thermal Switch TS180
JAGG OIL COOLERS
$27.95This bi-metal disc type thermostat installs directly into any 1/8" NPT port and provides an automatic switch to turn on 12V electric fan at the set temperature07130220- SKU:
- 07130220
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- FAN SWITCH
- RIDING STYLE:
- STREET
- STYLE:
- 180°F
- TYPE:
- AUTOMATIC
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
$27.95 -
Pro Filter 2011-2014 Beta 350 RR Oil Filter PF-631
PRO FILTER
$8.99Proper engine protection starts with filtration. The Pro Filter PF-631 uses advanced fibrous micro-pore technology to remove contaminants that would otherwise degrade oil quality and engine wear rates. For Beta 350 RR owners running either synthetic or...07120625- SKU:
- 07120625
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- PREMIUM
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$8.99 -
HOT RODS Seal Output Shaft OSK0010
HOT RODS
$27.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This HOT RODS complete kit eliminates guesswork by bundling everything you need to properly restore your seal in one purchase, saving...09350576- SKU:
- 09350576
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$27.95 -
HOT RODS Seal Output Shaft OSK0033
HOT RODS
$8.95A leaking countershaft seal will compromise your transmission performance and lead to costly internal damage if left unaddressed. This complete kit eliminates the guesswork by bundling everything needed for a proper seal replacement in one package,...09350596- SKU:
- 09350596
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$8.95 -
HOT RODS Seal Output Shaft OSK0036
HOT RODS
$30.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. The HOT RODS Seal Output Shaft kit eliminates the guesswork by bundling everything you need for a complete repair in one...09350598- SKU:
- 09350598
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- UNITS:
- KIT
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
HOT RODS Seal Output Shaft OSK0037
HOT RODS
$38.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This complete HOT RODS kit eliminates the guesswork by bundling everything needed for a proper repair in one purchase, saving you...09350599- SKU:
- 09350599
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$38.95 -
HOT RODS Seal Output Shaft OSK0054
HOT RODS
$39.95A leaking countershaft seal will compromise your transmission's integrity and lead to costly damage if left unaddressed. This complete kit from HOT RODS gives you everything needed to stop the leak and restore proper operation in one installation,...09350724- SKU:
- 09350724
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$39.95 -
HOT RODS Output Shaft Seal OSK0059
HOT RODS
$25.95A leaking countershaft seal can quickly escalate from minor seepage to catastrophic transmission failure if left unaddressed. This complete HOT RODS kit eliminates the guesswork by bundling everything you need to properly restore a failing countershaft...09351032- SKU:
- 09351032
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- OIL
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
$25.95 -
HOT RODS Water Pump Repair Kit - Kawasaki WPK0030
HOT RODS
$39.95A leaking water pump doesn't just waste coolant—it puts your engine at risk of overheating and catastrophic failure. The HOT RODS Water Pump Repair Kit gives you OEM-quality replacement internals to restore pump integrity without the cost of a full...09345375- SKU:
- 09345375
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$39.95 -
HOT RODS Water Pump Repair Kit - KTM WPK0068
HOT RODS
$70.95A leaking water pump compromises engine cooling efficiency and can lead to catastrophic overheating—especially under racing conditions or extended high-load operation. The HOT RODS Water Pump Repair Kit (WPK0068) gives you OEM-equivalent precision...09345377- SKU:
- 09345377
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.95 -
HOT RODS Water Pump Shaft HRSHA-004
HOT RODS
$39.95A worn water pump shaft compromises cooling system efficiency and risks seal failure, leading to coolant leaks and engine overheating. The HOT RODS Water Pump Shaft HRSHA-004 restores OE-specification performance with precision engineering and a polished...09500577- SKU:
- 09500577
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- WATER PUMP
- UNITS:
- EACH
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- OFF-ROAD
$39.95 -
HOT RODS Water Pump Shaft HRSHA-005
HOT RODS
$34.95A worn water pump shaft compromises cooling system efficiency and accelerates seal degradation, leading to costly leaks and potential engine damage. The HOT RODS Water Pump Shaft HRSHA-005 restores OE-spec performance with precision engineering and a...09500578- SKU:
- 09500578
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- OFF-ROAD
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
HOT RODS Counter Balancer Bearing Kit - Honda BBK0006
HOT RODS
$28.95When you're rebuilding or installing a new counter balancer, bearing quality directly impacts engine longevity and reliability. The HOT RODS Counter Balancer Bearing Kit delivers OEM-grade bearings engineered to handle the precise tolerances and...09500553- SKU:
- 09500553
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERBALANCE SHAFT
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
$28.95Qty in Cart: 0Quantity:Price:$28.95Subtotal: -
HOT RODS Counter Balancer Bearing Kit - Yamaha BBK0013
HOT RODS
$67.95A failing counter balancer bearing will compromise engine reliability and performance—especially critical during high-RPM operation or after case work. This HOT RODS kit delivers OEM-grade bearings engineered to handle the demanding loads of modern...09500555- SKU:
- 09500555
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING KIT
- TYPE:
- COUNTERBALANCE SHAFT
$67.95Qty in Cart: 0Quantity:Price:$67.95Subtotal: -
HOT RODS Counter Balancer Bearing Kit - Honda BBK0030
HOT RODS
$18.95If you're rebuilding or replacing your counter balancer shaft, using OEM-quality bearings is non-negotiable—substandard bearings will introduce vibration, reduce engine longevity, and compromise the entire build. The HOT RODS Counter Balancer Bearing Kit...09500909- SKU:
- 09500909
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COUNTERBALANCE SHAFT
- UNITS:
- KIT
$18.95 -
HOT RODS Connecting Rod 8103
HOT RODS
$151.95When you're pushing your engine to the limit, connecting rods are the critical link between combustion and reliability. The HOT RODS 8103 is engineered for high-rpm durability with precision manufacturing and metallurgy that handles sustained performance...422204- SKU:
- 422204
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- ENGINE TYPE:
- 2-CYCLE
- MATERIAL:
- 8620 STEEL
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal: -
HOT RODS Connecting Rod 8125
HOT RODS
$138.95When you're pushing your engine to high RPM limits, a failing connecting rod doesn't just cost you a race—it costs you an engine. The HOT RODS 8125 is built from certified 8620 AISI steel and engineered with caged needle roller bearings and precision...422209- SKU:
- 422209
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- ENGINE TYPE:
- 2-CYCLE
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
HOT RODS Water Pump Repair Kit - Yamaha WPK0059
HOT RODS
$34.95A failing water pump doesn't just waste your time—it puts your engine at risk. This HOT RODS repair kit gives you OEM-quality bearings and seals to restore proper cooling circulation and eliminate leaks without replacing the entire pump. Whether you're...09344044- SKU:
- 09344044
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95
