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 Cylinder Head Service Kit 80-82090
KIBBLEWHITE
MSRP: $928.95Now: $836.06Was: $928.95A complete cylinder head refresh demands precision components that work in harmony—and this Kibblewhite service kit eliminates the guesswork by bundling everything needed for a professional-grade...09263134- SKU:
- 09263134
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT:
- 0,445'
- MODEL:
- BLACK DIAMOND™
- SPRING SEAT PRESSURE:
- 53 LB
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.445'
- SPRING OPEN PRESSURE:
- 167 LB
- MATERIAL:
- C630 BRONZE
- UNITS:
- KIT
MSRP: $928.95Now: $836.06Was: $928.95Qty in Cart: 0Quantity:Price:MSRP: $928.95Now: $836.06Was: $928.95Subtotal: -
On Sale
KIBBLEWHITE Spring Kit - Stainless Steel 30-32440
KIBBLEWHITE
MSRP: $190.07Now: $171.06Was: $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...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
MSRP: $190.07Now: $171.06Was: $190.07Qty in Cart: 0Quantity:Price:MSRP: $190.07Now: $171.06Was: $190.07Subtotal: -
On Sale
KIBBLEWHITE Spring Kit - Stainless Steel 30-31230
KIBBLEWHITE
MSRP: $185.23Now: $166.71Was: $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...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'
MSRP: $185.23Now: $166.71Was: $185.23 -
On Sale
KIBBLEWHITE Intake Valve - Standard - CRF250R 2016+ 30-32412
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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®
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 30-32413
KIBBLEWHITE
MSRP: $37.95Now: $34.16Was: $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...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: $34.16Was: $37.95 -
On Sale
KIBBLEWHITE Valve Seal Kit 71014-4
KIBBLEWHITE
MSRP: $13.96Now: $12.56Was: $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...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'
MSRP: $13.96Now: $12.56Was: $13.96 -
On Sale
KIBBLEWHITE Intake Valve 80-81312
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE Black Diamond™ valve delivers measurable gains through precision engineering...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°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 80-81313
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 80-81317
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Valve Guide 80-81320
KIBBLEWHITE
MSRP: $17.83Now: $16.05Was: $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...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
MSRP: $17.83Now: $16.05Was: $17.83Qty in Cart: 0Quantity:Price:MSRP: $17.83Now: $16.05Was: $17.83Subtotal: -
On Sale
KIBBLEWHITE Intake Valve 82-82612
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 82-82613
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 82-82616
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE Black Diamond™ Intake Valve delivers precision engineering and material...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 82-82617
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve Guide 82-82620
KIBBLEWHITE
MSRP: $18.54Now: $16.69Was: $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...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
MSRP: $18.54Now: $16.69Was: $18.54 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 82-82630
KIBBLEWHITE
MSRP: $18.54Now: $16.69Was: $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...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'
MSRP: $18.54Now: $16.69Was: $18.54 -
On Sale
KIBBLEWHITE Intake Valve 60-60512H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 60-60516H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 60-60050H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $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...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
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Intake Valve 60-60051H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $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...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
MSRP: $31.01Now: $27.91Was: $31.01
