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 Exhaust Valve - Standard - Titanium - 2013-2018 96-96516T
KIBBLEWHITE
$109.33Exhaust valves are critical to your engine's breathing efficiency and longevity—especially under high-RPM demand. KIBBLEWHITE's titanium construction delivers superior heat resistance and durability compared to stock steel valves, reducing the risk of...09263051- SKU:
- 09263051
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- HEAD DIAMETER METRIC:
- 33.15 MM
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 30°
- STEM DIAMETER IMPERIAL:
- 0.2353'
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$109.33 -
KIBBLEWHITE Intake Valve - Standard - Titanium - 2017-2018 40-41412T
KIBBLEWHITE
$92.51Titanium intake valves are essential for high-RPM applications where stock valves can't handle sustained heat and stress. Kibblewhite's Tensilite® valves deliver the lightweight strength and thermal stability your engine needs to perform reliably at the...09263052- SKU:
- 09263052
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1764'
$92.51 -
KIBBLEWHITE Exhaust Valve - Standard - Titanium - 2017-2018 40-41416T
KIBBLEWHITE
$92.51Exhaust valves endure extreme thermal cycling and mechanical stress—factory originals often become a reliability weak point in high-revving or forced induction applications. KIBBLEWHITE's titanium Tensilite® valves deliver superior durability and thermal...09263053- SKU:
- 09263053
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1759'
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- TULIP ANGLE:
- 25°
- APPLICATION:
- EXHAUST
- MODEL:
- TENSILITE®
$92.51 -
KIBBLEWHITE Spring Kit 30-32800
KIBBLEWHITE
$207.83If you're running a boosted engine or pairing your build with a high-performance cam, stock valve springs will fail you under sustained high-RPM loads. The Kibblewhite 30-32800 Spring Kit delivers the valve control and durability you need to support...09263087- SKU:
- 09263087
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- SPRING LIFT IMPERIAL:
- INTAKE 0.440', EXHAUST 0.405'
- SPRING OPEN PRESSURE:
- INTAKE 162 LB, EXHAUST 220 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- INTAKE 0,440' , EXHAUST 0,405'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- SPRING SEAT PRESSURE:
- INTAKE 50 LB, EXHAUST 90 LB
$207.83 -
KIBBLEWHITE Intake Valve 30-32812H
KIBBLEWHITE
$37.55Valve integrity directly impacts engine reliability and performance under extreme conditions. The Kibblewhite White Diamond™ intake valve delivers superior heat resistance and durability through precision engineering and premium materials, ensuring...09263088- SKU:
- 09263088
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1960'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 38.00 MM
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.080'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 20°
$37.55 -
KIBBLEWHITE Exhaust Valve - Standard - CRF450R - 2017-2019 30-32816K
KIBBLEWHITE
$47.83High-revving engines demand valves that can handle extreme temperatures and constant stress without degradation. The KIBBLEWHITE Exhaust Valve delivers the durability and precision machining required for reliable performance in your CRF450R, whether...09263089- SKU:
- 09263089
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 31.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1955'
- TULIP ANGLE:
- 23°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
$47.83 -
KIBBLEWHITE Intake Valve Guide 30-32820
KIBBLEWHITE
$34.40If you're rebuilding a high-performance engine or restoring a classic with modern reliability in mind, valve guides are the unsung foundation of cylinder head integrity. The KIBBLEWHITE 30-32820 is precision-machined from C630 material to handle today's...09263090- SKU:
- 09263090
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BRONZE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$34.40 -
KIBBLEWHITE Exhaust Valve Guide 30-32830
KIBBLEWHITE
$34.40If you're rebuilding a high-revving engine or restoring a classic with modern reliability demands, valve guides that can handle both no-lead fuel and aggressive valve-stem materials are non-negotiable. The KIBBLEWHITE 30-32830 exhaust valve guide...09263091- SKU:
- 09263091
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- COLOR/FINISH:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- APPLICATION:
- EXHAUST
$34.40 -
KIBBLEWHITE Spring Kit 40-41400
KIBBLEWHITE
$220.26If you're running a high-lift camshaft or forced induction setup, your stock valve springs aren't engineered to handle the sustained pressures at elevated RPMs. The KIBBLEWHITE Spring Kit 40-41400 delivers the valvetrain control and reliability you need...09263092- SKU:
- 09263092
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,415'
- SPRING LIFT IMPERIAL:
- 0.415'
- SPRING OPEN PRESSURE:
- INTAKE 181 LB, EXHAUST 155 LB
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- SPRING SEAT PRESSURE:
- INTAKE 65 LB, EXHAUST 49 LB
$220.26 -
KIBBLEWHITE Spring Kit - Intake Only 96-96540
KIBBLEWHITE
$198.71If you're running high-RPM applications or pushing your engine beyond stock parameters, your intake valvetrain is working harder than OEM engineers intended. The KIBBLEWHITE Spring Kit replaces stock titanium components with purpose-engineered stainless...09263093- SKU:
- 09263093
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SPRING OPEN PRESSURE:
- 205 LB
- APPLICATION:
- INTAKE
- SPRING LIFT:
- 0,435'
- SPRING SEAT PRESSURE:
- 80 IB
- TYPE:
- CONVERSION
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT IMPERIAL:
- 0.435'
$198.71 -
KIBBLEWHITE Intake Valve Guide 40-40520
KIBBLEWHITE
$30.72If you're running a high-revving engine or building a performance head, valve guide wear will kill your flow efficiency and compromise ring sealing. The KIBBLEWHITE Intake Valve Guide 40-40520 delivers precision-machined durability with a tapered nose...09263096- SKU:
- 09263096
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE GUIDE
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1765'
- SIZE IMPERIAL:
- STANDARD
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3765'
- RIDING STYLE:
- OFF-ROAD
$30.72 -
KIBBLEWHITE Exhaust Valve Guide 80-80120
KIBBLEWHITE
$22.29If you're rebuilding a high-performance engine or restoring a classic, valve guide wear directly impacts combustion efficiency, oil consumption, and overall reliability. The KIBBLEWHITE 80-80120 exhaust valve guide is precision-machined from C630...09263098- SKU:
- 09263098
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- PRODUCT NAME:
- VALVE GUIDE
- COLOR/FINISH:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- STANDARD
$22.29Qty in Cart: 0Quantity:Price:$22.29Subtotal: -
KIBBLEWHITE Valve Guide Seal - Intake/Exhaust 71041-4
KIBBLEWHITE
$13.96Valve guide seals are critical to preventing oil from seeping into your combustion chamber—a problem that causes smoking, increased blow-by, and accelerated carbon buildup. KIBBLEWHITE's Viton seals deliver reliable, long-term performance without the...09263099- SKU:
- 09263099
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- TYPE:
- VALVE GUIDE
- UNITS:
- 4 PACK
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.320'
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.435'
$13.96Qty in Cart: 0Quantity:Price:$13.96Subtotal: -
KIBBLEWHITE Exhaust Valve 30-30225
KIBBLEWHITE
$31.01Exhaust valves are critical to your engine's reliability and peak performance—they're under extreme thermal and mechanical stress every combustion cycle. The KIBBLEWHITE Black Diamond™ 30-30225 delivers the durability and precision needed to maintain...09263055- SKU:
- 09263055
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH IMPERIAL:
- 3.310'
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- BLACK DIAMOND™
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1957'
- TULIP ANGLE:
- 20°
- HEAD DIAMETER METRIC:
- 30.00 MM
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Intake Valve - Standard - CRF450R 30-32812T
KIBBLEWHITE
$92.51Factory intake valves are prone to wear under sustained high-RPM operation, leading to decreased sealing efficiency and lost power. The Kibblewhite Tensilite® intake valve delivers precision-forged titanium construction with a specialized PVD coating...09263056- SKU:
- 09263056
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1960'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 38.00 MM
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
$92.51 -
KIBBLEWHITE Keeper Set 80-81330
KIBBLEWHITE
$37.84Valve spring keepers are a critical component that directly impacts engine reliability and performance—especially under high RPM conditions where valve float can cause catastrophic failure. The KIBBLEWHITE Keeper Set 80-81330 uses high tensile strength...09263114- SKU:
- 09263114
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- KEEPER SET
- UNITS:
- SET
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.177'
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 0.221'
$37.84Qty in Cart: 0Quantity:Price:$37.84Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 90-91400
KIBBLEWHITE
$1,021.95A complete cylinder head refresh demands precision components that can handle sustained high RPM and thermal stress without compromise. This Kibblewhite service kit delivers everything needed for a proper top-end overhaul, eliminating the guesswork of...09263115- SKU:
- 09263115
- Availability:
- Ships Same Business Day
- Weight:
- 2.20 LBS
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- SPRING OPEN PRESSURE:
- 177 LB
- SPRING SEAT PRESSURE:
- 57 LB
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0.470'
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.470'
$1,021.95 -
KIBBLEWHITE Cylinder Head Service Kit 30-33300
KIBBLEWHITE
$449.60A complete top-end refresh demands precision components that work together seamlessly—and that's exactly what the KIBBLEWHITE 30-33300 delivers. This comprehensive service kit eliminates the guesswork by combining OEM-quality gaskets, high-performance...09263116- SKU:
- 09263116
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- MATERIAL:
- TITANIUM
- SPRING LIFT IMPERIAL:
- 0.350'
- SPRING SEAT PRESSURE:
- 50 LB
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,350'
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 145 LB
- UNITS:
- KIT
$449.60Qty in Cart: 0Quantity:Price:$449.60Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 30-33320
KIBBLEWHITE
$473.84A complete cylinder head refresh demands precision components that work in concert—and this kit delivers exactly that. Whether you're rebuilding after hard racing or upgrading a stock head, the KIBBLEWHITE 30-33320 eliminates the guesswork by bundling...09263118- SKU:
- 09263118
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,380'
- SPRING SEAT PRESSURE:
- 51 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.380'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- MATERIAL:
- C630 BRONZE
- SPRING OPEN PRESSURE:
- 160 LB
$473.84Qty in Cart: 0Quantity:Price:$473.84Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 30-33330
KIBBLEWHITE
$513.75A complete top-end refresh requires more than just new gaskets—your cylinder head needs precision components that can handle sustained RPMs and thermal stress. The KIBBLEWHITE 30-33330 Service Kit delivers everything necessary to restore flow,...09263119- SKU:
- 09263119
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- INTAKE 0.440', EXHAUST 0.405'
- SPRING OPEN PRESSURE:
- INTAKE 162 LB, EXHAUST 220 LB
- SPRING SEAT PRESSURE:
- INTAKE 50 LB, EXHAUST 90 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- INTAKE 0,440' , EXHAUST 0,405'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
$513.75
