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 Exhaust Valve Guide 30-32832
KIBBLEWHITE
MSRP: $30.95Now: $22.00Was: $30.95Valve guide wear is one of the quickest ways to lose compression and increase oil consumption in a high-performance engine. The KIBBLEWHITE Exhaust Valve Guide 30-32832 is engineered with Ampco-45 compound to withstand extreme heat cycles and maintain...09263152- SKU:
- 09263152
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4380'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- OVERSIZE (+0.002')
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- APPLICATION:
- EXHAUST
MSRP: $30.95Now: $22.00Was: $30.95 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 30-32839
KIBBLEWHITE
MSRP: $30.95Now: $22.00Was: $30.95Valve guide wear is one of the most common causes of oil consumption and performance loss in high-mileage engines—and replacing them with precision-engineered components is essential for restoring compression and reliability. The KIBBLEWHITE Exhaust...09263153- SKU:
- 09263153
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
- OUTSIDE DIAMETER IMPERIAL:
- 0.446'
- UNITS:
- EACH
MSRP: $30.95Now: $22.00Was: $30.95 -
KIBBLEWHITE Intake Valve 40-41412H
KIBBLEWHITE
$37.55Intake valve reliability directly impacts engine efficiency and longevity—especially under high RPM and forced induction conditions. KIBBLEWHITE's White Diamond™ valves are precision-engineered from premium materials and finished with hard chrome plating...09263155- SKU:
- 09263155
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- LENGTH IMPERIAL:
- 3.460'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1764'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Exhaust Valve 40-41416H
KIBBLEWHITE
$37.55High-revving engines demand exhaust valves that can withstand extreme temperatures and sustained abuse without degradation. The KIBBLEWHITE White Diamond™ valve delivers the durability and precision fit that separates reliable power from catastrophic...09263156- SKU:
- 09263156
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 25.00 MM
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1759'
- LENGTH IMPERIAL:
- 3.170'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
$37.55 -
KIBBLEWHITE Valve Guide 96-96522
KIBBLEWHITE
$19.95Valve guide wear compromises combustion seal integrity and increases oil consumption—precision engineering is non-negotiable for reliable performance. KIBBLEWHITE's Ampco-45 construction delivers superior heat dissipation and wear resistance, maintaining...09263158- SKU:
- 09263158
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4372'
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2353'
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- OVERSIZE (+0.002')
- RIDING STYLE:
- OFF-ROAD
$19.95Qty in Cart: 0Quantity:Price:$19.95Subtotal: -
KIBBLEWHITE Intake Spring Kit 30-33200
KIBBLEWHITE
$185.23Factory intake valves wear out—it's physics. The KIBBLEWHITE 30-33200 stainless steel conversion kit replaces them with components engineered to last 4x longer, keeping your valvetrain reliable through countless heat cycles and high-RPM demands. If...09263169- SKU:
- 09263169
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING LIFT:
- 0,440'
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
- UNITS:
- KIT
$185.23 -
KIBBLEWHITE Intake Spring Kit 30-33250
KIBBLEWHITE
$185.23Factory titanium intake valves degrade under sustained high-RPM operation, leading to valve float, loss of compression, and costly head work. The KIBBLEWHITE Intake Spring Kit 30-33250 replaces these components with stainless steel Black Diamond valves...09263170- SKU:
- 09263170
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- TYPE:
- CONVERSION
- SPRING LIFT:
- 0,440'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- UNITS:
- KIT
$185.23 -
KIBBLEWHITE Spring Kit 80-82300
KIBBLEWHITE
$220.26A quality valve spring kit is critical for maintaining proper valve seating and preventing float at high RPMs—factors that directly impact engine reliability and performance. The KIBBLEWHITE Spring Kit 80-82300 delivers OEM-grade engineering with...09263176- SKU:
- 09263176
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- SPRING OPEN PRESSURE:
- INTAKE 187 LB, EXHAUST 149 LB
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- INTAKE 0.420', EXHAUST 0.400'
- TYPE:
- VALVE
$220.26 -
KIBBLEWHITE Exhaust Valve 80-82316
KIBBLEWHITE
$31.01Exhaust valves are critical wear components that directly impact engine efficiency, throttle response, and longevity. The KIBBLEWHITE 80-82316 Black Diamond™ valve eliminates common failure points found in stock or budget alternatives through precision...09263179- SKU:
- 09263179
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 25.00 MM
- LENGTH IMPERIAL:
- 3.235'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 30°
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1760'
$31.01 -
KIBBLEWHITE Intake Valve - Standard - Titanium - YZ250F 80-82312T
KIBBLEWHITE
$92.51Titanium intake valves are essential for high-revving engines where weight reduction directly translates to faster throttle response and improved fuel efficiency. The Kibblewhite Tensilite® valve eliminates the weight penalty of traditional steel while...09263180- SKU:
- 09263180
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1962'
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 18°
$92.51Qty in Cart: 0Quantity:Price:$92.51Subtotal: -
KIBBLEWHITE Exhaust Valve - Standard - Titanium - YZ250F - 2019 80-82316T
KIBBLEWHITE
$92.51Factory exhaust valves are a critical wear item that directly impacts engine breathing and combustion efficiency. A premium titanium replacement like the KIBBLEWHITE Tensilite® valve restores lost performance and reliability while delivering superior...09263181- SKU:
- 09263181
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1760'
- TULIP ANGLE:
- 30°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 25.00 MM
$92.51 -
KIBBLEWHITE Intake Valve Guide 80-82320
KIBBLEWHITE
$15.92If you're rebuilding a high-mileage engine or restoring a classic, worn valve guides compromise compression, increase oil consumption, and hurt flow efficiency. The KIBBLEWHITE 80-82320 Intake Valve Guide is precision-machined from C630 material to...09263182- SKU:
- 09263182
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- BROWN
- PRODUCT NAME:
- VALVE GUIDE
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1962'
- SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- RIDING STYLE:
- OFF-ROAD
$15.92 -
KIBBLEWHITE Intake Valve Guide 80-82329
KIBBLEWHITE
$15.92Valve guide wear is one of the most common causes of oil consumption, compression loss, and poor ring sealing in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 80-82329 restores proper valve stem clearance with precision C630 machining,...09263185- SKU:
- 09263185
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BRONZE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.1962'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4057'
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
$15.92 -
KIBBLEWHITE Exhaust Valve Guide 80-82330
KIBBLEWHITE
$15.92Factory valve guides wear out, causing excess clearance that tanks flow efficiency and invites valve recession—especially in high-mileage or boosted applications. KIBBLEWHITE's C630 precision-machined guides restore OEM geometry with tighter tolerances...09263186- SKU:
- 09263186
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3563'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- EXHAUST
$15.92 -
KIBBLEWHITE Exhaust Valve Guide 80-82339
KIBBLEWHITE
$15.92If you're building or rebuilding a high-performance engine, valve guide quality directly impacts cylinder head durability and flow efficiency. The KIBBLEWHITE 80-82339 is precision-machined from C630 material to handle sustained high RPM operation while...09263189- SKU:
- 09263189
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3663'
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
$15.92 -
KIBBLEWHITE Valve Guide Seal Kit - 4 pack 80-82345
KIBBLEWHITE
$13.96Valve guide seals are critical to controlling oil consumption and maintaining compression in your engine—worn seals allow oil to seep past valve guides, contaminating the combustion chamber and degrading performance. KIBBLEWHITE's Viton® seal kit...09263190- SKU:
- 09263190
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- TYPE:
- VALVE GUIDE
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
$13.96 -
KIBBLEWHITE Intake Valve 82-82255
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity—making quality valve selection critical for any high-revving application. The KIBBLEWHITE Black Diamond™ Intake Valve 82-82255 delivers precision...09263279- SKU:
- 09263279
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH IMPERIAL:
- 3.765'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 34.42 MM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2160'
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 17°
$37.55 -
KIBBLEWHITE Intake Valve - Titanium - CRF250 - 2018-2020 30-33612T
KIBBLEWHITE
$109.33Maximize your CRF250's combustion efficiency with a precision-engineered intake valve built for aggressive riding demands. Kibblewhite's titanium construction delivers a significant weight reduction compared to stock steel valves, allowing faster valve...09263283- SKU:
- 09263283
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- HEAD DIAMETER METRIC:
- 33.00 MM
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 16°
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1961'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
$109.33 -
KIBBLEWHITE Exhaust Valve - Titanium - CRF250 - 2018-2020 30-33616T
KIBBLEWHITE
$109.33Titanium exhaust valves are essential for high-revving engines where stock valves can't withstand repeated thermal and mechanical stress. The Kibblewhite Tensilite® valve reduces reciprocating mass, allowing your CRF250 to breathe easier and respond...09263284- SKU:
- 09263284
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1956'
- TULIP ANGLE:
- 18°
$109.33 -
KIBBLEWHITE Valve Spring Kit 30-33650
KIBBLEWHITE
$229.93If you're running a high-lift cam or forced induction setup, your stock valve springs are a liability. The KIBBLEWHITE 30-33650 kit delivers the spring rates and valve control needed to keep your valvetrain stable at elevated RPMs, preventing float and...09263285- SKU:
- 09263285
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- RIDING STYLE:
- STREET
- SPRING LIFT:
- 0,390'
- SPRING SEAT PRESSURE:
- 49 LB
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.390'
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
$229.93
