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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On Sale
KIBBLEWHITE Intake Valve - YZ250F - Standard 80-80073
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55The YZ250F demands intake valves that can handle sustained high RPM cycles without sacrificing precision or durability. KIBBLEWHITE's Black Diamond™ valves are purpose-built from premium EV8 stainless steel and engineered to minimize friction while...09260123- SKU:
- 09260123
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 23.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1568'
- LENGTH IMPERIAL:
- 3.150'
- TULIP ANGLE:
- 25°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Center Intake Valve - YZ250F - Standard 80-80075
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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 Valve for YZ250F replaces weak OEM components with...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
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve - YZ250F - Standard 80-80077
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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 extreme combustion temperatures and repeated high-RPM...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
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Spring Kit 30-30590
KIBBLEWHITE
MSRP: $229.93Now: $206.94Was: $229.93A 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 engineering needed to restore or upgrade your valve train with...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
MSRP: $229.93Now: $206.94Was: $229.93 -
On Sale
KIBBLEWHITE Intake Valve - CRF250R - Standard 30-30630
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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 precision valve sealing while the proprietary multi-stage...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve - CRF250R - Standard 30-30633
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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 fit and durability through advanced materials and...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Valve Spring Kit 60-60045
KIBBLEWHITE
MSRP: $148.65Now: $133.79Was: $148.65Valve 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. The KIBBLEWHITE 60-60045 kit delivers OEM-quality...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
MSRP: $148.65Now: $133.79Was: $148.65 -
On Sale
KIBBLEWHITE Valve Spring Kit 30-30640
KIBBLEWHITE
MSRP: $207.81Now: $187.03Was: $207.81High-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 band. Whether you're running a stock rebuild or a heavily...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
MSRP: $207.81Now: $187.03Was: $207.81 -
On Sale
KIBBLEWHITE Valve Spring Kit 80-80100
KIBBLEWHITE
MSRP: $221.92Now: $199.73Was: $221.92Valve 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 consistent lift, seat pressure, and durability required to...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
MSRP: $221.92Now: $199.73Was: $221.92Qty in Cart: 0Quantity:Price:MSRP: $221.92Now: $199.73Was: $221.92Subtotal: -
On Sale
KIBBLEWHITE Intake Valve 80-80872
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, throttle response, and overall engine reliability—especially under high-RPM conditions where inferior valves fail prematurely. KIBBLEWHITE's Black Diamond™ valves are engineered to...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°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 80-80876
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $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) delivers measurable durability gains through precision...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
MSRP: $31.01Now: $27.91Was: $31.01Qty in Cart: 0Quantity:Price:MSRP: $31.01Now: $27.91Was: $31.01Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 80-81100
KIBBLEWHITE
MSRP: $185.23Now: $166.71Was: $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 worn or marginal valvetrain components with...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
MSRP: $185.23Now: $166.71Was: $185.23 -
On Sale
KIBBLEWHITE Valve Spring Kit 30-31580
KIBBLEWHITE
MSRP: $185.23Now: $166.71Was: $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 extend engine life. The KIBBLEWHITE Valve Spring Kit...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
MSRP: $185.23Now: $166.71Was: $185.23Qty in Cart: 0Quantity:Price:MSRP: $185.23Now: $166.71Was: $185.23Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 96-96450
KIBBLEWHITE
MSRP: $218.32Now: $196.49Was: $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 purpose-engineered stainless steel conversion that...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
MSRP: $218.32Now: $196.49Was: $218.32 -
On Sale
KIBBLEWHITE Valve Spring Kit 80-80850
KIBBLEWHITE
MSRP: $303.29Now: $272.96Was: $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 purpose-engineered stainless steel alternatives that extend...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'
MSRP: $303.29Now: $272.96Was: $303.29Qty in Cart: 0Quantity:Price:MSRP: $303.29Now: $272.96Was: $303.29Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 80-80950
KIBBLEWHITE
MSRP: $303.29Now: $272.96Was: $303.29If 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 components with purpose-engineered stainless steel internals...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'
MSRP: $303.29Now: $272.96Was: $303.29 -
On Sale
KIBBLEWHITE Intake Valve - Honda 30-30630T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $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 and durability under extreme combustion pressures,...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
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Intake Valve - Honda 30-31162T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $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 material science and precision machining that separates stock...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
MSRP: $92.51Now: $83.26Was: $92.51Qty in Cart: 0Quantity:Price:MSRP: $92.51Now: $83.26Was: $92.51Subtotal: -
On Sale
KIBBLEWHITE Intake Valve - Honda 30-31462T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $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 precision you need to build an engine that performs...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'
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Intake Valve - Kawasaki 40-40140T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $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 aerospace-grade titanium with precision CNC machining to withstand...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°
MSRP: $92.51Now: $83.26Was: $92.51
