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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KIBBLEWHITE Intake Valve Guide 80-80040
KIBBLEWHITE
$19.83Valve guides are critical to engine longevity and performance—they control oil consumption, maintain proper valve sealing, and prevent catastrophic wear under high RPM and sustained heat cycles. The KIBBLEWHITE 80-80040 Intake Valve Guide is engineered...KW8080040- SKU:
- KW8080040
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- AMPCO-45
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- OUTSIDE DIAMETER IMPERIAL:
- 0.4550'
- RIDING STYLE:
- UTV
- INSIDE DIAMETER IMPERIAL:
- 0.2345'
- PRODUCT NAME:
- VALVE GUIDE
$19.83 -
KIBBLEWHITE Exhaust Valve Guide 80-80050
KIBBLEWHITE
$19.83Valve guide wear is one of the most common causes of compression loss and oil burning in high-performance engines. The KIBBLEWHITE 80-80050 exhaust valve guide uses Ampco-45 bronze—a specialized alloy engineered specifically for the extreme thermal...KW8080050- SKU:
- KW8080050
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- AMPCO-45
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2348'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4550'
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- VALVE GUIDE
$19.83 -
KIBBLEWHITE Intake Valve 30-31462
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, cylinder fill rate, and overall engine responsiveness—making quality valve selection critical for both street and race applications. KIBBLEWHITE's Black Diamond™ valves deliver measurable...09261136- SKU:
- 09261136
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- HEAD DIAMETER METRIC:
- 30.50 MM
- LENGTH IMPERIAL:
- 3.500'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1960'
- UNITS:
- EACH
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
$37.55 -
KIBBLEWHITE Exhaust Valve 30-31466
KIBBLEWHITE
$37.55Exhaust valves endure extreme temperatures and combustion pressures cycle after cycle—material quality directly impacts engine reliability and performance longevity. The Kibblewhite Black Diamond™ valve delivers precision CNC machining and proprietary...09261138- SKU:
- 09261138
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- TULIP ANGLE:
- 20°
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.310'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1760'
$37.55 -
KIBBLEWHITE Center Intake Valve 80-8056H
KIBBLEWHITE
$54.10If you're running a high-performance engine, valve quality directly impacts reliability and power delivery under extreme conditions. KIBBLEWHITE's White Diamond™ center intake valves are precision-engineered from premium materials and finished to...KW808056H- SKU:
- KW808056H
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- CENTER INTAKE
- LENGTH IMPERIAL:
- 3.280'
- TULIP ANGLE:
- 15°
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- STEM DIAMETER IMPERIAL:
- 0.1765'
- HEAD DIAMETER METRIC:
- 27.00 MM
- PRODUCT NAME:
- VALVE
$54.10 -
KIBBLEWHITE Exhaust Valve 80-8057H
KIBBLEWHITE
$54.10High-revving engines demand valves engineered to withstand extreme temperatures and repeated shock loads without compromise. The KIBBLEWHITE White Diamond™ exhaust valve delivers the precision and durability required for serious performance builds,...KW808057H- SKU:
- KW808057H
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 28.00 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 25°
- LENGTH IMPERIAL:
- 3.220'
$54.10 -
KIBBLEWHITE Exhaust Valve 30-30075
KIBBLEWHITE
$54.10Valve durability directly impacts engine reliability and performance consistency—especially under high-RPM conditions where thermal stress and friction accelerate wear. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the precision engineering and...KW3030075- SKU:
- KW3030075
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 23.50 MM
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.765'
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1955'
- TULIP ANGLE:
- 29°
$54.10 -
KIBBLEWHITE Intake Valve 30-30081
KIBBLEWHITE
$54.10High-revving engines demand intake valves that can handle extreme temperatures and constant stress without sacrificing flow. The KIBBLEWHITE Black Diamond™ Intake Valve delivers the durability and precision engineering you need to maintain peak...KW3030081- SKU:
- KW3030081
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2160'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 28.50 MM
- LENGTH IMPERIAL:
- 3.805'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 23°
$54.10 -
KIBBLEWHITE Intake Valve - TRX450R - Standard 30-30950
KIBBLEWHITE
$31.01Your TRX450R's intake valve is exposed to extreme combustion temperatures and constant mechanical stress—factory valves wear quickly under high-performance demands. The KIBBLEWHITE Black Diamond™ Intake Valve delivers superior durability and reliability...09260416- SKU:
- 09260416
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STEM DIAMETER IMPERIAL:
- 0.2158'
- HEAD DIAMETER METRIC:
- 36.00 MM
- MODEL:
- BLACK DIAMOND™
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.315'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Spring Kit 30-30085
KIBBLEWHITE
$108.01A high-quality valve spring kit is fundamental to any engine build or rebuild—it directly impacts valve timing accuracy, durability under high RPM, and overall engine reliability. The KIBBLEWHITE Spring Kit 30-30085 delivers OEM-grade performance with...KW3030085- SKU:
- KW3030085
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- 0.430'
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- SPRING OPEN PRESSURE:
- 201 LB
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
$108.01Qty in Cart: 0Quantity:Price:$108.01Subtotal: -
KIBBLEWHITE Exhaust Valve - TRX450R - Standard 30-30953
KIBBLEWHITE
$31.01Stock exhaust valves are a common wear point that can compromise engine efficiency and reliability, especially in high-RPM applications like the TRX450R. The KIBBLEWHITE Black Diamond™ Exhaust Valve is engineered to outlast OEM components while...09260418- SKU:
- 09260418
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- STEM DIAMETER IMPERIAL:
- 0.1957'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- HEAD DIAMETER METRIC:
- 30.00 MM
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.310'
- RIDING STYLE:
- ATV
$31.01 -
KIBBLEWHITE Exhaust Valve 30-30090
KIBBLEWHITE
$54.10Exhaust valves are critical to engine reliability and performance—a worn or marginal valve compromises combustion efficiency, increases heat stress, and accelerates internal wear. The KIBBLEWHITE Black Diamond™ 30-30090 exhaust valve delivers the...KW3030090- SKU:
- KW3030090
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 22.50 MM
- LENGTH IMPERIAL:
- 3.650'
- PRODUCT NAME:
- VALVE
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2150'
- TULIP ANGLE:
- 29°
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
$54.10 -
KIBBLEWHITE Spring Kit 30-31050
KIBBLEWHITE
$207.81Valve spring performance directly impacts your engine's RPM ceiling, valve timing accuracy, and overall reliability under high-load conditions. The KIBBLEWHITE Spring Kit 30-31050 delivers precision-engineered springs with titanium upper collars that...09260420- SKU:
- 09260420
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- MATERIAL:
- TITANIUM
- SPRING LIFT IMPERIAL:
- 0.440'
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
$207.81 -
KIBBLEWHITE Intake Valve - CRF450X - 2005-2007 - Standard 30-31062
KIBBLEWHITE
$31.01Your CRF450X's intake valve is under constant thermal and mechanical stress—factory valves wear faster than you'd expect, especially if you're pushing RPMs or running extended seasons. Kibblewhite's Black Diamond™ intake valve replaces worn or damaged...09260421- SKU:
- 09260421
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 35.00 MM
- LENGTH IMPERIAL:
- 3.315'
- STEM DIAMETER IMPERIAL:
- 0.2158'
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- MODEL:
- BLACK DIAMOND™
$31.01 -
KIBBLEWHITE Intake Valve - CRF250R - 2008 - Standard 30-31162
KIBBLEWHITE
$37.55If you're running a CRF250R, intake valve longevity directly impacts engine reliability and peak performance. KIBBLEWHITE's Black Diamond™ valves eliminate the weak link in your cylinder head—factory valves simply can't match the durability and friction...09260430- SKU:
- 09260430
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.280'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1957'
$37.55 -
KIBBLEWHITE Exhaust Valve - CRF250R - 2008 - Standard 30-31166
KIBBLEWHITE
$37.55Stock exhaust valves wear under sustained high-RPM operation, leading to compression loss and reduced engine efficiency. The Kibblewhite Black Diamond™ valve is engineered to withstand the thermal and mechanical demands of competition and hard riding,...09260434- SKU:
- 09260434
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- STEM DIAMETER IMPERIAL:
- 0.1760'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- LENGTH IMPERIAL:
- 3.235'
- HEAD DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Valve Spring Kit 30-3041
KIBBLEWHITE
$136.54High-revving engines demand valve springs engineered for sustained performance under extreme conditions. KIBBLEWHITE's complete spring kit delivers the durability and consistency required for race applications and high-output builds, eliminating...KW303041- SKU:
- KW303041
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- SPRING LIFT IMPERIAL:
- 0.400'
- APPLICATION:
- INTAKE
- MATERIAL:
- CHROME-SILICON
- SPRING OPEN PRESSURE:
- 192 LB
- SPRING SEAT PRESSURE:
- 76 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,400'
- TYPE:
- VALVE
$136.54 -
KIBBLEWHITE Intake/Exhaust Valve Guide 30-3100
KIBBLEWHITE
$34.40Valve guides are critical to engine longevity—they control oil consumption, maintain precise valve seating, and prevent catastrophic wear. The KIBBLEWHITE 30-3100 valve guide uses a proprietary Ampco-45 copper-nickel alloy that outperforms cast iron in...KW303100- SKU:
- KW303100
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- AMPCO-45
- MATERIAL:
- NICKEL
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4355'
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- MATERIAL:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
$34.40 -
KIBBLEWHITE Valve Spring Kit 30-3111
KIBBLEWHITE
$99.26Valve spring degradation is one of the leading causes of performance loss and catastrophic engine failure in high-revving applications. The KIBBLEWHITE Valve Spring Kit 30-3111 delivers OEM-quality components with race-proven durability, ensuring...KW303111- SKU:
- KW303111
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- MATERIAL:
- TITANIUM
- SPRING LIFT:
- 0,300'
- SPRING SEAT PRESSURE:
- 70 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- SPRING OPEN PRESSURE:
- 157 LB
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.300'
- TYPE:
- VALVE
$99.26 -
KIBBLEWHITE Intake Kit 40-40350
KIBBLEWHITE
$185.23OEM titanium intake valves wear out faster than you'd like, especially under sustained high-RPM conditions. The KIBBLEWHITE Black Diamond intake valve kit replaces those factory components with stainless steel alternatives that extend valvetrain life by...09260452- SKU:
- 09260452
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT:
- 0,445'
- SPRING OPEN PRESSURE:
- 155 LB
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 46 LB
- TYPE:
- CONVERSION
- SPRING LIFT IMPERIAL:
- 0.445'
$185.23
