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 Cylinder Head Service Kit 30-33360
KIBBLEWHITE
MSRP: $420.39Now: $378.35Was: $420.39A complete top-end refresh requires precision components engineered to withstand extreme temperatures and sustained RPMs—this kit delivers every critical component in one package. Whether you're rebuilding after a season or upgrading for competitive...09263122- SKU:
- 09263122
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- SPRING LIFT:
- 0,440'
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
MSRP: $420.39Now: $378.35Was: $420.39 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 40-41500
KIBBLEWHITE
MSRP: $453.05Now: $407.75Was: $453.05A complete top-end refresh demands quality components that work together as a system—not mismatched parts thrown at a problem. The KIBBLEWHITE Cylinder Head Service Kit 40-41500 eliminates guesswork by bundling race-proven valve springs, guides, and...09263123- SKU:
- 09263123
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- SPRING SEAT PRESSURE:
- 46 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
- MATERIAL:
- C630 BRONZE
- SPRING OPEN PRESSURE:
- 155 LB
MSRP: $453.05Now: $407.75Was: $453.05 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 40-41520
KIBBLEWHITE
MSRP: $475.16Now: $427.64Was: $475.16A complete cylinder head refresh demands more than piecemeal replacements—you need matched, precision components engineered to work together. The KIBBLEWHITE Cylinder Head Service Kit 40-41520 eliminates the guesswork by bundling everything required for...09263125- SKU:
- 09263125
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- SPRING SEAT PRESSURE:
- 46 LB
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- SPRING OPEN PRESSURE:
- INTAKE 155 LB, EXHAUST 146 LB
MSRP: $475.16Now: $427.64Was: $475.16 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 40-41470
KIBBLEWHITE
MSRP: $426.28Now: $383.65Was: $426.28A complete top-end refresh demands precision components engineered to handle sustained high RPM operation. The KIBBLEWHITE Cylinder Head Service Kit 40-41470 delivers everything needed to restore or upgrade your cylinder head with OEM-quality gaskets and...09263126- SKU:
- 09263126
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.415'
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,415'
- SPRING OPEN PRESSURE:
- INTAKE 169 LB, EXHAUST 170 LB
- SPRING SEAT PRESSURE:
- INTAKE 64 LB, EXHAUST 65 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $426.28Now: $383.65Was: $426.28 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 40-41480
KIBBLEWHITE
MSRP: $426.28Now: $383.65Was: $426.28A complete top-end refresh requires precision components engineered to withstand high RPM loads and thermal stress. The KIBBLEWHITE Cylinder Head Service Kit 40-41480 delivers everything needed to restore flow efficiency, valve sealing integrity, and...09263127- SKU:
- 09263127
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.415'
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,415'
- SPRING OPEN PRESSURE:
- INTAKE 169 LB, EXHAUST 170 LB
- SPRING SEAT PRESSURE:
- INTAKE 64 LB, EXHAUST 65 LB
MSRP: $426.28Now: $383.65Was: $426.28 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 82-83150
KIBBLEWHITE
MSRP: $668.26Now: $601.43Was: $668.26A worn or stock cylinder head limits your engine's potential and reliability under racing conditions. The KIBBLEWHITE 82-83150 Cylinder Head Service Kit gives you everything needed for a complete top-end refresh with race-proven components that improve...09263128- SKU:
- 09263128
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- SPRING OPEN PRESSURE:
- 205 LB
- SPRING SEAT PRESSURE:
- 80 IB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,435'
- MATERIAL:
- C630 BRONZE
MSRP: $668.26Now: $601.43Was: $668.26 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 60-61600
KIBBLEWHITE
MSRP: $436.00Now: $392.40Was: $436.00A complete cylinder head refresh demands precision components that work in concert—and this kit delivers exactly that. The KIBBLEWHITE 60-61600 eliminates the guesswork of sourcing individual top-end parts, giving you validated, race-proven components...09263129- SKU:
- 09263129
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- MATERIAL:
- TITANIUM
- SPRING SEAT PRESSURE:
- 51 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
MSRP: $436.00Now: $392.40Was: $436.00 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 80-82070
KIBBLEWHITE
MSRP: $428.22Now: $385.40Was: $428.22A complete cylinder head refresh isn't just maintenance—it's the foundation for reliable power and longevity in high-rev environments. The Kibblewhite 80-82070 eliminates the guesswork by pairing premium valve springs, durable bronze guides, and...09263132- SKU:
- 09263132
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT:
- 0,450'
- SPRING LIFT IMPERIAL:
- 0.450'
- SPRING OPEN PRESSURE:
- 155 LB
- SPRING SEAT PRESSURE:
- 46 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- MATERIAL:
- C630 BRONZE
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $428.22Now: $385.40Was: $428.22 -
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 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'
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 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®
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 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: $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 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'
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 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°
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 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'
MSRP: $37.55Now: $33.80Was: $37.55 -
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 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
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 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°
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 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'
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. 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
MSRP: $37.55Now: $33.80Was: $37.55 -
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 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'
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 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'
MSRP: $37.55Now: $33.80Was: $37.55
