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
-
On Sale
KIBBLEWHITE Valve Guide 30-3030
KIBBLEWHITE
MSRP: $37.93Now: $34.14Was: $37.93Valve guide wear is one of the primary culprits behind oil consumption, reduced compression, and poor ring sealing in high-performance engines. The KIBBLEWHITE Valve Guide 30-3030 delivers the...KW303030- SKU:
- KW303030
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2150'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4355'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- MATERIAL:
- AMPCO-45
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $37.93Now: $34.14Was: $37.93 -
On Sale
KIBBLEWHITE Intake Kit 30-31200
KIBBLEWHITE
MSRP: $190.07Now: $171.06Was: $190.07If you're running high-revving applications or pushing your engine hard, OEM titanium intake valves wear down quickly—leaving you sidelined during critical races or events. The KIBBLEWHITE 30-31200...09260442- SKU:
- 09260442
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 50 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,345'
- SPRING LIFT IMPERIAL:
- 0.345'
- SPRING OPEN PRESSURE:
- 145 LB
- TYPE:
- CONVERSION
MSRP: $190.07Now: $171.06Was: $190.07Qty in Cart: 0Quantity:Price:MSRP: $190.07Now: $171.06Was: $190.07Subtotal: -
On Sale
KIBBLEWHITE Intake Kit 30-31210
KIBBLEWHITE
MSRP: $185.23Now: $166.71Was: $185.23If you're running high-RPM applications or extended engine cycles, OEM intake valves become a wear bottleneck that limits both reliability and performance. The KIBBLEWHITE Black Diamond intake kit...09260443- SKU:
- 09260443
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- 147 LB
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
MSRP: $185.23Now: $166.71Was: $185.23 -
On Sale
KIBBLEWHITE Valve Guide 40-40320
KIBBLEWHITE
MSRP: $17.83Now: $16.05Was: $17.83Valve guides are critical to maintaining precise valve seating and preventing excessive wear in high-performance engines. The KIBBLEWHITE 40-40320 is engineered with Ampco-45 bronze—a copper-heavy...09260449- SKU:
- 09260449
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.4363'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2150'
- MATERIAL:
- C630 BRONZE
- SIZE IMPERIAL:
- STANDARD
MSRP: $17.83Now: $16.05Was: $17.83 -
On Sale
KIBBLEWHITE Intake Valve 30-3115
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Precision intake valve flow and reliability demand materials that can withstand extreme combustion pressures and thermal cycling without degradation. KIBBLEWHITE's Black Diamond™ valves are...KW303115- SKU:
- KW303115
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- HEAD DIAMETER METRIC:
- 33.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2156'
- LENGTH IMPERIAL:
- 4.040'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 30-3116
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, fuel economy, and horsepower output—making quality valve selection critical for any engine build. The KIBBLEWHITE Black Diamond™...KW303116- SKU:
- KW303116
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2156'
- HEAD DIAMETER METRIC:
- 43.00 MM
- LENGTH IMPERIAL:
- 4.020'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 82-82230
KIBBLEWHITE
MSRP: $26.43Now: $23.79Was: $26.43Valve guide wear is one of the most common causes of compression loss and oil consumption in high-mileage engines. The KIBBLEWHITE 82-82230 Exhaust Valve Guide delivers the thermal conductivity and...09261176- SKU:
- 09261176
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER IMPERIAL:
- 0.4531'
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2355'
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $26.43Now: $23.79Was: $26.43 -
On Sale
KIBBLEWHITE Intake Valve 82-82212
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valves are the gatekeepers of your engine's breathing efficiency—and a worn or substandard valve directly compromises power delivery and reliability. The Kibblewhite Black Diamond™ intake...09261178- SKU:
- 09261178
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 35.00 MM
- LENGTH IMPERIAL:
- 4.510'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2357'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 82-82216
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valves endure extreme thermal and mechanical stress—OEM components often fail prematurely, compromising engine efficiency and reliability. The KIBBLEWHITE Black Diamond™ valve delivers the...09261180- SKU:
- 09261180
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 30.00 MM
- RIDING STYLE:
- ATV
- LENGTH IMPERIAL:
- 4.555'
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2352'
- TULIP ANGLE:
- 11°
- MODEL:
- BLACK DIAMOND™
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake/Exhaust Valve Guide 30-4069
KIBBLEWHITE
MSRP: $26.89Now: $24.20Was: $26.89Valve guide wear is one of the most common causes of oil consumption, poor ring sealing, and valve seat degradation in high-performance engines. The KIBBLEWHITE 30-4069 Intake/Exhaust Valve Guide...KW304069- SKU:
- KW304069
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- MATERIAL:
- AMPCO-45
- PRODUCT NAME:
- VALVE GUIDE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4372'
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $26.89Now: $24.20Was: $26.89 -
On Sale
KIBBLEWHITE Valve Seat 10-SB250
KIBBLEWHITE
MSRP: $30.30Now: $27.27Was: $30.30If you're running titanium valves in a high-performance engine, your valve seats need to match that precision. KIBBLEWHITE's copper-based seats deliver the thermal conductivity and wear resistance...09261619- SKU:
- 09261619
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- VALVE SEAT
- VALVE SEAT HEIGHT METRIC:
- 9.00 MM
- INSIDE DIAMETER METRIC:
- 17.00 MM
- OUTSIDE DIAMETER METRIC:
- 25.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $30.30Now: $27.27Was: $30.30 -
On Sale
KIBBLEWHITE Valve Seat 10-SB280
KIBBLEWHITE
MSRP: $30.30Now: $27.27Was: $30.30If you're running titanium valves in a high-performance engine, valve seat material directly impacts your engine's thermal stability, durability, and longevity under sustained boost or high RPM...09261620- SKU:
- 09261620
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE SEAT
- APPLICATION:
- EXHAUST
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- OUTSIDE DIAMETER METRIC:
- 28.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 20.00 MM
- MATERIAL:
- TITANIUM
MSRP: $30.30Now: $27.27Was: $30.30 -
On Sale
KIBBLEWHITE Valve Seat 10-SB350
KIBBLEWHITE
MSRP: $34.71Now: $31.24Was: $34.71If you're running titanium valves in a high-performance application, valve seat material matters—a lot. KIBBLEWHITE's copper-based seats deliver superior thermal conductivity and wear resistance,...09261626- SKU:
- 09261626
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- INSIDE DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER METRIC:
- 35.00 MM
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
MSRP: $34.71Now: $31.24Was: $34.71 -
On Sale
KIBBLEWHITE Valve Seat 10-SB385
KIBBLEWHITE
MSRP: $40.81Now: $36.73Was: $40.81If you're running titanium valves in a high-performance engine, your valve seats need to match that precision. The KIBBLEWHITE 10-SB385 is purpose-built to handle the thermal demands and wear...09261627- SKU:
- 09261627
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- INSIDE DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- TITANIUM
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
- OUTSIDE DIAMETER METRIC:
- 38.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
MSRP: $40.81Now: $36.73Was: $40.81 -
On Sale
KIBBLEWHITE Valve Seat 10-SB390
KIBBLEWHITE
MSRP: $40.81Now: $36.73Was: $40.81If you're running titanium valves in a high-performance engine, your valve seats are the critical interface between extreme heat and precision engineering. KIBBLEWHITE's copper-based seat design...09261628- SKU:
- 09261628
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- INSIDE DIAMETER METRIC:
- 30.00 MM
- MATERIAL:
- TITANIUM
- OUTSIDE DIAMETER METRIC:
- 39.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
MSRP: $40.81Now: $36.73Was: $40.81 -
On Sale
KIBBLEWHITE Cast Iron Valve Seat 10-SC290
KIBBLEWHITE
MSRP: $8.24Now: $7.42Was: $8.24If you're running high-RPM applications or alternative fuels—whether it's nitrous, forced induction, or methanol—your valve seats need to withstand extreme thermal stress and microwelding without...09261631- SKU:
- 09261631
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 29.00 MM
- PRODUCT NAME:
- VALVE SEAT
MSRP: $8.24Now: $7.42Was: $8.24 -
On Sale
KIBBLEWHITE Cast Iron Valve Seat 10-SC310
KIBBLEWHITE
MSRP: $8.49Now: $7.64Was: $8.49Valve seat recession is one of the most insidious problems in high-performance engines—it silently erodes compression, destroys your power curve, and forces expensive rebuilds. The KIBBLEWHITE Cast...09261632- SKU:
- 09261632
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- INSIDE DIAMETER METRIC:
- 23.00 MM
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- HEAD DIAMETER METRIC:
- 31.00 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- ATV
MSRP: $8.49Now: $7.64Was: $8.49 -
On Sale
KIBBLEWHITE Cast Iron Valve Seat 10-SC390
KIBBLEWHITE
MSRP: $9.57Now: $8.61Was: $9.57Valve seat recession and microwelding are silent killers in high-performance engines—they compromise combustion efficiency, increase blow-by, and shorten engine life. The KIBBLEWHITE Cast Iron Valve...09261638- SKU:
- 09261638
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- INSIDE DIAMETER METRIC:
- 30.00 MM
- OUTSIDE DIAMETER METRIC:
- 39.00 MM
- HEAD DIAMETER METRIC:
- 39.00 MM
- VALVE SEAT HEIGHT METRIC:
- 10.00 MM
MSRP: $9.57Now: $8.61Was: $9.57 -
On Sale
KIBBLEWHITE Spring Kit - .440" 30-31250
KIBBLEWHITE
MSRP: $207.83Now: $187.05Was: $207.83Valve spring performance directly impacts your engine's ability to maintain precise valve timing under high RPM conditions. The KIBBLEWHITE Spring Kit delivers consistent lift and closure across the...09261640- SKU:
- 09261640
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
MSRP: $207.83Now: $187.05Was: $207.83Qty in Cart: 0Quantity:Price:MSRP: $207.83Now: $187.05Was: $207.83Subtotal: -
On Sale
KIBBLEWHITE Exhaust Valve 30-31266
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Exhaust valves are critical to engine reliability and performance—they endure extreme heat cycling and high-velocity gas flow that demands superior material integrity. KIBBLEWHITE's Black Diamond™...09261643- SKU:
- 09261643
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 30.00 MM
- LENGTH IMPERIAL:
- 3.175'
- TULIP ANGLE:
- 20°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
MSRP: $31.01Now: $27.91Was: $31.01
