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
-
KIBBLEWHITE Spring Kit - Stainless Steel 30-32440
KIBBLEWHITE
$190.07Stock titanium intake valves wear down quickly under sustained high RPM operation, compromising engine reliability and forcing costly rebuilds. The Kibblewhite Spring Kit converts your cylinder head to forged stainless steel Black Diamond intake valves,...09262978- SKU:
- 09262978
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT IMPERIAL:
- 0.380'
- SPRING OPEN PRESSURE:
- 160 LB
- TYPE:
- CONVERSION
- PRODUCT NAME:
- VALVE KIT
- SPRING LIFT:
- 0,380'
- RIDING STYLE:
- OFF-ROAD
- SPRING SEAT PRESSURE:
- 51 LB
- UNITS:
- KIT
$190.07Qty in Cart: 0Quantity:Price:$190.07Subtotal: -
KIBBLEWHITE Spring Kit - Stainless Steel 30-31230
KIBBLEWHITE
$185.23If you're running high-RPM applications or extended engine cycles, your OEM intake valvetrain is likely limiting both performance and longevity. The KIBBLEWHITE Spring Kit upgrades your cylinder head to stainless steel Black Diamond intake valves and...09262979- SKU:
- 09262979
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT IMPERIAL:
- 0.440'
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
- UNITS:
- KIT
- SPRING LIFT:
- 0,440'
$185.23 -
KIBBLEWHITE Intake Valve - Standard - CRF250R 2016+ 30-32412
KIBBLEWHITE
$37.55Factory intake valves wear faster than any other valve in your CRF250R, leading to compression loss and sluggish throttle response. The Kibblewhite Tensilite® intake valve restores precision fit and durability with a premium titanium forging that...09262981- SKU:
- 09262981
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.50 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1961'
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MODEL:
- TENSILITE®
$37.55 -
On Sale
KIBBLEWHITE Intake Valve 30-32413
KIBBLEWHITE
MSRP: $37.95Now: $24.00Was: $37.95The KIBBLEWHITE Black Diamond™ Intake Valve delivers the precision and durability demanded by high-performance engines. Its single-piece forging eliminates weak points, while the proprietary multi-stage friction-reduction process ensures reliable...09262982- SKU:
- 09262982
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1961'
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.500'
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 31.50 MM
- MODEL:
- BLACK DIAMOND™
MSRP: $37.95Now: $24.00Was: $37.95 -
KIBBLEWHITE Valve Seal Kit 71014-4
KIBBLEWHITE
$13.96Valve seal degradation leads to oil consumption, blue smoke, and loss of compression—issues that compound quickly in high-performance engines. The KIBBLEWHITE Valve Seal Kit 71014-4 delivers OEM-exceeding durability with 100% solid Viton® construction,...09262984- SKU:
- 09262984
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 4.50 MM
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.370'
$13.96 -
KIBBLEWHITE Intake Valve 80-81312
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE Black Diamond™ valve delivers measurable gains through precision engineering and superior materials, reducing friction while...09263028- SKU:
- 09263028
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.495'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 31.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1765'
- TULIP ANGLE:
- 15°
$37.55 -
KIBBLEWHITE Intake Valve 80-81313
KIBBLEWHITE
$37.55If you're serious about engine reliability and longevity, valve quality directly impacts combustion efficiency, heat dissipation, and resistance to thermal cycling stress. The KIBBLEWHITE Black Diamond™ Intake Valve delivers the precision engineering and...09263029- SKU:
- 09263029
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- LENGTH IMPERIAL:
- 3.495'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 32.00 MM
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 15°
- STEM DIAMETER IMPERIAL:
- 0.1765'
$37.55 -
KIBBLEWHITE Exhaust Valve 80-81317
KIBBLEWHITE
$37.55Exhaust valves are critical flow points in your engine—weak ones cost you horsepower and durability. The KIBBLEWHITE Black Diamond™ exhaust valve delivers precision-engineered performance through advanced materials and manufacturing, ensuring consistent...09263031- SKU:
- 09263031
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 27.00 MM
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.470'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- STEM DIAMETER IMPERIAL:
- 0.1760'
- TULIP ANGLE:
- 25°
$37.55 -
KIBBLEWHITE Valve Guide 80-81320
KIBBLEWHITE
$17.83Valve guides are the backbone of cylinder head durability—they keep your valves aligned under extreme heat and pressure cycles. Kibblewhite's Ampco-45 construction delivers superior thermal conductivity and wear resistance, ensuring your valvetrain...09263032- SKU:
- 09263032
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3564'
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
$17.83 -
KIBBLEWHITE Intake Valve 82-82612
KIBBLEWHITE
$37.55Intake valves are critical to your engine's breathing efficiency and longevity—cheap or worn valves will rob you of power and reliability. The KIBBLEWHITE Black Diamond™ Intake Valve delivers precision engineering with superior corrosion resistance,...09263033- SKU:
- 09263033
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- LENGTH IMPERIAL:
- 3.775'
- HEAD DIAMETER METRIC:
- 37.72 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 17°
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2160'
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Intake Valve 82-82613
KIBBLEWHITE
$37.55Your engine's intake valve is under constant thermal and mechanical stress—poorly engineered valves lead to carbon buildup, premature wear, and power loss. KIBBLEWHITE's Black Diamond™ valves are engineered to withstand extreme conditions while...09263034- SKU:
- 09263034
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- HEAD DIAMETER METRIC:
- 38.72 MM
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.775'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2160'
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 17°
$37.55 -
KIBBLEWHITE Intake Valve 82-82616
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE Black Diamond™ Intake Valve delivers precision engineering and material science that minimizes friction losses while maximizing...09263035- SKU:
- 09263035
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 25°
- LENGTH IMPERIAL:
- 3.805'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- HEAD DIAMETER METRIC:
- 29.21 MM
- STEM DIAMETER IMPERIAL:
- 0.2155'
$37.55 -
KIBBLEWHITE Intake Valve 82-82617
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, fuel atomization, and overall engine responsiveness—making quality valve selection critical for both track and street applications. The KIBBLEWHITE Black Diamond™ valve leverages precision...09263036- SKU:
- 09263036
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 25°
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 30.21 MM
- LENGTH IMPERIAL:
- 3.805'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$37.55 -
KIBBLEWHITE Intake Valve Guide 82-82620
KIBBLEWHITE
$18.54Valve guides are a critical component in maintaining proper valve seating and engine longevity—poor guides lead to oil burning, compression loss, and accelerated wear. The KIBBLEWHITE Intake Valve Guide 82-82620 is engineered from Ampco-45, a...09263037- SKU:
- 09263037
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2160'
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- OUTSIDE DIAMETER IMPERIAL:
- 0.4353'
- SIZE IMPERIAL:
- STANDARD
$18.54 -
KIBBLEWHITE Exhaust Valve Guide 82-82630
KIBBLEWHITE
$18.54Valve guide wear is one of the quickest ways to compromise combustion efficiency and increase oil consumption in high-performance engines. The KIBBLEWHITE Exhaust Valve Guide 82-82630 uses Ampco-45 bronze to deliver superior heat transfer and wear...09263038- SKU:
- 09263038
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.4353'
$18.54 -
KIBBLEWHITE Intake Valve 60-60512H
KIBBLEWHITE
$37.55A quality intake valve is fundamental to your engine's breathing efficiency and thermal management under extreme conditions. KIBBLEWHITE's White Diamond™ valves deliver the precision engineering and durability demanded by competitive racers and serious...09263139- SKU:
- 09263139
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- WHITE DIAMOND™
- TULIP ANGLE:
- 15°
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- LENGTH IMPERIAL:
- 3.175'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- STEM DIAMETER IMPERIAL:
- 0.1765'
$37.55 -
KIBBLEWHITE Exhaust Valve 60-60516H
KIBBLEWHITE
$37.55High-RPM engines demand valves that can withstand extreme temperatures and sustained combustion pressures without degradation. KIBBLEWHITE's White Diamond™ exhaust valves deliver the thermal stability and durability required for serious racing and...09263140- SKU:
- 09263140
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- WHITE DIAMOND™
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.185'
- HEAD DIAMETER METRIC:
- 25.00 MM
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- STEM DIAMETER IMPERIAL:
- 0.1760'
- TULIP ANGLE:
- 25°
$37.55 -
KIBBLEWHITE Intake Valve 60-60050H
KIBBLEWHITE
$31.01If you're serious about engine reliability and consistent performance, your intake valves need to handle extreme temperatures and combustion pressures without compromise. The KIBBLEWHITE White Diamond™ intake valve combines aerospace-grade materials with...09263141- SKU:
- 09263141
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH IMPERIAL:
- 3.245'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 36.00 MM
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1960'
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Intake Valve 60-60051H
KIBBLEWHITE
$31.01If you're running a high-revving engine that demands precision, valve quality directly impacts combustion efficiency, heat dissipation, and longevity under extreme conditions. KIBBLEWHITE's White Diamond™ valves eliminate the guesswork with one-piece...09263142- SKU:
- 09263142
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH IMPERIAL:
- 3.245'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SIZE METRIC:
- OVERSIZE
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1960'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
$31.01 -
KIBBLEWHITE Exhaust Valve 60-60053H
KIBBLEWHITE
$31.01Exhaust valves are the gatekeepers of your engine's breathing cycle—and inferior valves will cost you horsepower, reliability, and race-day consistency. KIBBLEWHITE's White Diamond™ valves are engineered to withstand extreme heat cycling and aggressive...09263143- SKU:
- 09263143
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.210'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 17°
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1953'
- UNITS:
- EACH
$31.01
