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 Center Intake Valve - YZ250F - Standard 80-80075
KIBBLEWHITE
$37.55Valve durability directly impacts engine reliability and performance consistency, especially under high-RPM conditions where stock valves often show premature wear. The KIBBLEWHITE Center Intake...09260124- SKU:
- 09260124
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- CENTER INTAKE
- LENGTH IMPERIAL:
- 3.095'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 25°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1568'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 23.00 MM
- RIDING STYLE:
- OFF-ROAD
$37.55 -
KIBBLEWHITE Exhaust Valve - YZ250F - Standard 80-80077
KIBBLEWHITE
$37.55Valve degradation is one of the fastest ways to lose compression and power in your YZ250F. The KIBBLEWHITE Exhaust Valve delivers the precision engineering and material science needed to withstand...09260125- SKU:
- 09260125
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 24.50 MM
- TULIP ANGLE:
- 25°
- LENGTH IMPERIAL:
- 3.070'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1758'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Spring Kit 30-30590
KIBBLEWHITE
$246.03A properly functioning valve train is critical to engine reliability and performance, and worn or damaged springs compromise both. The KIBBLEWHITE Spring Kit 30-30590 delivers the precision...09260210- SKU:
- 09260210
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- 0.350'
- SPRING OPEN PRESSURE:
- 145 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- TITANIUM
$246.03 -
KIBBLEWHITE Intake Valve - CRF250R - Standard 30-30630
KIBBLEWHITE
$37.55Factory intake valves are prone to wear and carbon buildup, which directly impacts combustion efficiency and throttle response on your CRF250R. The Kibblewhite Black Diamond™ intake valve restores...09260211- SKU:
- 09260211
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1961'
- LENGTH IMPERIAL:
- 3.280'
$37.55 -
KIBBLEWHITE Exhaust Valve - CRF250R - Standard 30-30633
KIBBLEWHITE
$37.55Factory valve tolerances degrade quickly under high heat and combustion stress, robbing your CRF250R of reliability and peak performance. Kibblewhite's Black Diamond™ exhaust valves restore precision...09260213- SKU:
- 09260213
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- LENGTH IMPERIAL:
- 3.235'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1956'
$37.55 -
KIBBLEWHITE Valve Spring Kit 60-60045
KIBBLEWHITE
$159.05Valve springs are the unsung foundation of reliable engine performance—they control valve timing precision and prevent float at high RPMs, which directly impacts power delivery and engine longevity...09260215- SKU:
- 09260215
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- EXHAUST
- SPRING OPEN PRESSURE:
- 171 LB
- SPRING SEAT PRESSURE:
- 57 LB
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- TYPE:
- VALVE
- UNITS:
- KIT
$159.05 -
KIBBLEWHITE Valve Spring Kit 30-30640
KIBBLEWHITE
$222.36High-RPM valve train stability demands springs engineered to precise specifications—Kibblewhite's 30-30640 kit delivers consistent seat pressure and reliable valve control across your entire power...09260137- SKU:
- 09260137
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.440'
- APPLICATION:
- INTAKE
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- TYPE:
- VALVE
$222.36 -
KIBBLEWHITE Valve Spring Kit 80-80100
KIBBLEWHITE
$237.46Valve spring degradation is one of the most common causes of performance loss and catastrophic engine failure in high-revving applications. The KIBBLEWHITE Valve Spring Kit 80-80100 delivers the...09260249- SKU:
- 09260249
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.375'
- SPRING OPEN PRESSURE:
- 85 LB
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- UNITS:
- KIT
$237.46 -
KIBBLEWHITE Intake Valve 80-80872
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and overall engine reliability—especially under high-RPM conditions where inferior valves fail prematurely...09262918- SKU:
- 09262918
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.280'
- STEM DIAMETER IMPERIAL:
- 0.2158'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
$37.55 -
KIBBLEWHITE Exhaust Valve 80-80876
KIBBLEWHITE
$31.01Exhaust valves endure extreme thermal cycling and abrasive combustion environments—stock units wear quickly and compromise engine efficiency. The KIBBLEWHITE Black Diamond™ Exhaust Valve (80-80876)...09262919- SKU:
- 09262919
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- TULIP ANGLE:
- 28°
- LENGTH IMPERIAL:
- 3.380'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 30.50 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$31.01 -
KIBBLEWHITE Valve Spring Kit 80-81100
KIBBLEWHITE
$185.23If you're running high-RPM applications or extended track sessions, OEM titanium valve springs degrade quickly under sustained stress. The Kibblewhite 80-81100 stainless steel conversion kit replaces...09262920- SKU:
- 09262920
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.450'
- SPRING OPEN PRESSURE:
- 155 LB
- SPRING SEAT PRESSURE:
- 46 LB
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,450'
- UNITS:
- KIT
$185.23 -
KIBBLEWHITE Valve Spring Kit 30-31580
KIBBLEWHITE
$185.23If you're running high-RPM applications or simply want to eliminate valve train wear before it becomes a problem, upgrading to stainless steel valves and springs is one of the most reliable ways to...09262734- SKU:
- 09262734
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SPRING SEAT PRESSURE:
- 40 LB
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,440'
- SPRING OPEN PRESSURE:
- 147 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- SPRING LIFT IMPERIAL:
- 0.440'
- TYPE:
- CONVERSION
- MATERIAL:
- STAINLESS STEEL
$185.23Qty in Cart: 0Quantity:Price:$185.23Subtotal: -
KIBBLEWHITE Valve Spring Kit 96-96450
KIBBLEWHITE
$218.32If you're running a high-revving engine, valve spring failure is a real threat to reliability and performance. The KIBBLEWHITE Valve Spring Kit 96-96450 replaces your OEM titanium components with a...09262736- SKU:
- 09262736
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- RIDING STYLE:
- STREET
- SPRING LIFT IMPERIAL:
- 0.425'
- TYPE:
- CONVERSION
- PRODUCT NAME:
- VALVE KIT
- SPRING LIFT:
- 0,425'
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- SPRING OPEN PRESSURE:
- 169 LB
- MATERIAL:
- STAINLESS STEEL
- SPRING SEAT PRESSURE:
- 60 LB
$218.32 -
KIBBLEWHITE Valve Spring Kit 80-80850
KIBBLEWHITE
$303.29If your valvetrain is running OEM titanium components, you're leaving durability and longevity on the table. The KIBBLEWHITE Valve Spring Kit 80-80850 replaces wear-prone intake valves with...09262737- SKU:
- 09262737
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- SPRING OPEN PRESSURE:
- 86 LB
- TYPE:
- CONVERSION
- PRODUCT NAME:
- VALVE KIT
- SPRING LIFT:
- 0,380'
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- SPRING SEAT PRESSURE:
- 39 LB
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.380'
$303.29Qty in Cart: 0Quantity:Price:$303.29Subtotal: -
KIBBLEWHITE Valve Spring Kit 80-80950
KIBBLEWHITE
$324.52If you're running a high-revving engine that demands reliability, valve spring failure can sideline you unexpectedly. The KIBBLEWHITE 80-80950 Valve Spring Kit replaces wear-prone OEM titanium...09262739- SKU:
- 09262739
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.380'
- SPRING OPEN PRESSURE:
- 86 LB
- TYPE:
- CONVERSION
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 39 LB
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SPRING LIFT:
- 0,380'
$324.52 -
KIBBLEWHITE Intake Valve - Honda 30-30630T
KIBBLEWHITE
$92.51If you're serious about maximizing your Honda's engine efficiency and reliability, a premium intake valve is non-negotiable. The Kibblewhite Tensilite® intake valve delivers superior heat resistance...09262740- SKU:
- 09262740
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1960'
- UNITS:
- EACH
$92.51 -
KIBBLEWHITE Intake Valve - Honda 30-31162T
KIBBLEWHITE
$92.51Intake valve reliability directly impacts combustion efficiency and engine longevity, especially in high-revving or forced-induction applications. The Kibblewhite Tensilite® valve delivers the...09262741- SKU:
- 09262741
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1960'
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
$92.51Qty in Cart: 0Quantity:Price:$92.51Subtotal: -
KIBBLEWHITE Intake Valve - Honda 30-31462T
KIBBLEWHITE
$109.33High-revving Honda engines demand intake valves that can handle extreme temperatures and repeated impact cycles without degrading. The KIBBLEWHITE Tensilite® intake valve delivers the durability and...09262742- SKU:
- 09262742
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.50 MM
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1960'
$109.33 -
KIBBLEWHITE Intake Valve - Kawasaki 40-40140T
KIBBLEWHITE
$92.51High-rpm engine reliability hinges on valve durability, and intake valve wear directly impacts combustion efficiency and power delivery. The KIBBLEWHITE Tensilite® intake valve combines...09262746- SKU:
- 09262746
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1765'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
$92.51 -
KIBBLEWHITE Exhaust Valve - Kawasaki 40-40143T
KIBBLEWHITE
$92.51High-revving engines demand valves that can withstand extreme thermal and mechanical stress without compromise. KIBBLEWHITE Tensilite® exhaust valves are engineered from premium titanium forgings and...09262747- SKU:
- 09262747
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 25.00 MM
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
$92.51
