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 40-40416
KIBBLEWHITE
$31.01Exhaust valves endure extreme thermal cycling and chemical exposure—factory components often succumb to carbon buildup, corrosion, and premature wear. The Kibblewhite Black Diamond™ Exhaust Valve (40-40416) is engineered to outlast OEM parts by combining...09261651- SKU:
- 09261651
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- UTV
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- HEAD DIAMETER METRIC:
- 26.00 MM
- LENGTH IMPERIAL:
- 3.655'
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 10°
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Valve Guide 40-40420
KIBBLEWHITE
$19.83Valve guide wear is one of the most overlooked causes of oil consumption and compression loss in high-performance engines. The KIBBLEWHITE Valve Guide 40-40420 uses premium Ampco-45 composition to deliver the thermal conductivity and wear resistance your...09261653- SKU:
- 09261653
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- RIDING STYLE:
- UTV
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4160'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
$19.83 -
KIBBLEWHITE Exhaust Valve 60-60210H
KIBBLEWHITE
$37.55Exhaust valves experience extreme thermal and mechanical stress, and OEM units often succumb to wear, carbon buildup, and corrosion—compromising engine efficiency and reliability. The KIBBLEWHITE Black Diamond™ 60-60210H delivers precision-engineered...09261656- SKU:
- 09261656
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.120'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1765'
$37.55 -
KIBBLEWHITE Exhaust Valve 60-60213H
KIBBLEWHITE
$37.55If you're building a high-revving engine that demands reliability under extreme conditions, valve quality directly impacts combustion efficiency, longevity, and peak horsepower. KIBBLEWHITE's Black Diamond™ exhaust valves are engineered to withstand...09261658- SKU:
- 09261658
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 25°
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.115'
- MODEL:
- BLACK DIAMOND™
$37.55 -
KIBBLEWHITE Spring Kit - .445" 60-60500
KIBBLEWHITE
$220.26Valve spring integrity directly impacts engine reliability and performance across the entire RPM band. This KIBBLEWHITE Spring Kit delivers precisely engineered spring rates and damping characteristics, ensuring consistent valve control whether you're...09261660- SKU:
- 09261660
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
$220.26 -
KIBBLEWHITE Valve Guide 60-60520
KIBBLEWHITE
$17.83Valve guide wear is one of the most common failure points in high-performance engines, leading to oil consumption, blow-by, and reduced ring sealing. The KIBBLEWHITE Valve Guide 60-60520 is engineered with Ampco-45 bronze to handle the extreme thermal...09261665- SKU:
- 09261665
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1765'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3778'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
$17.83 -
KIBBLEWHITE Intake Valve Guide 80-80770
KIBBLEWHITE
$22.29Valve guide wear directly compromises compression, increases oil consumption, and degrades cylinder sealing—all of which kill power and reliability. The KIBBLEWHITE 80-80770 Intake Valve Guide uses Ampco-45, a copper-nickel alloy engineered for superior...09261687- SKU:
- 09261687
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.2165'
- RIDING STYLE:
- OFF-ROAD
$22.29 -
KIBBLEWHITE Exhaust Valve Guide 80-80780
KIBBLEWHITE
$22.29Valve guide wear directly compromises combustion chamber seal and engine performance—this KIBBLEWHITE exhaust valve guide maintains precise bore tolerances and thermal stability under sustained high-RPM operation. Built from Ampco-45, a copper-nickel...09261688- SKU:
- 09261688
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- NICKEL
- SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- AMPCO-45
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2160'
- MATERIAL:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
$22.29 -
KIBBLEWHITE Intake Valve 82-82155
KIBBLEWHITE
$37.55Factory intake valves wear down under sustained heat and combustion pressure, robbing your engine of efficiency and reliability. The KIBBLEWHITE Black Diamond™ Intake Valve delivers measurable gains in flow consistency, corrosion resistance, and...09261689- SKU:
- 09261689
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MODEL:
- BLACK DIAMOND™
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.72 MM
- LENGTH IMPERIAL:
- 3.775'
- STEM DIAMETER IMPERIAL:
- 0.2160'
- TULIP ANGLE:
- 17°
$37.55 -
KIBBLEWHITE Exhaust Valve 82-82158
KIBBLEWHITE
$37.55Exhaust valve performance directly impacts engine efficiency, throttle response, and longevity under high RPM conditions. The KIBBLEWHITE Black Diamond™ valve delivers measurable improvements in flow characteristics and durability, making it essential...09261691- SKU:
- 09261691
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 32.44 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.815'
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- TULIP ANGLE:
- 25°
$37.55 -
KIBBLEWHITE Spring Kit 96-96000
KIBBLEWHITE
$181.00A precision valve spring kit is fundamental to reliable high-RPM performance and consistent valve timing across the entire powerband. KIBBLEWHITE's engineered spring solution eliminates the risk of valve float and spring fatigue that can derail race day...09261696- SKU:
- 09261696
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 214 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- TYPE:
- VALVE
$181.00 -
KIBBLEWHITE Intake Valve 96-96004
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability under sustained high RPM operation. The Kibblewhite Black Diamond™ valve delivers measurable gains in flow consistency and durability...09261697- SKU:
- 09261697
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 35.00 MM
- LENGTH IMPERIAL:
- 3.815'
- TULIP ANGLE:
- 20°
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
$37.55 -
KIBBLEWHITE Intake Valve 96-96005
KIBBLEWHITE
$37.55Intake valve performance directly impacts your engine's breathing efficiency and power delivery—a worn or inferior valve compromises combustion quality and throttle response. KIBBLEWHITE's Black Diamond™ intake valves are engineered from premium EV8...09261698- SKU:
- 09261698
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.815'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
- TULIP ANGLE:
- 20°
$37.55 -
KIBBLEWHITE Exhaust Valve 96-96007
KIBBLEWHITE
$37.55Valve degradation under extreme combustion temperatures is one of the fastest ways to lose power and reliability in a high-performance engine. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the durability and precision needed to withstand repeated...09261699- SKU:
- 09261699
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2342'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.815'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- HEAD DIAMETER METRIC:
- 30.00 MM
- RIDING STYLE:
- OFF-ROAD
$37.55 -
KIBBLEWHITE Exhaust Valve 96-96008
KIBBLEWHITE
$37.55Exhaust valves are among the most thermally stressed and wear-prone components in your engine—they need to withstand extreme temperatures, corrosive combustion byproducts, and thousands of cycles per minute. The KIBBLEWHITE Black Diamond™ exhaust valve...09261700- SKU:
- 09261700
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH IMPERIAL:
- 3.815'
- STEM DIAMETER IMPERIAL:
- 0.2342'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Intake Valve Guide 96-96010
KIBBLEWHITE
$22.29Valve guide wear is one of the most common causes of oil consumption and performance degradation in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 96-96010 replaces worn guides with a precision-engineered component that restores proper valve...09261701- SKU:
- 09261701
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
$22.29 -
KIBBLEWHITE Exhaust Valve Guide 96-96020
KIBBLEWHITE
$22.29Valve guide wear is a silent killer of engine performance, causing increased oil consumption, blow-by, and eventual catastrophic valve failure. The KIBBLEWHITE Exhaust Valve Guide 96-96020 is precision-engineered from Ampco-45, a copper-nickel compound...09261702- SKU:
- 09261702
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
$22.29 -
KIBBLEWHITE Exhaust Valve 96-96266
KIBBLEWHITE
$54.10Your engine's exhaust valves endure extreme temperatures and constant stress—factory components often fall short under high-performance demands. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the durability and reliability you need for sustained...09261713- SKU:
- 09261713
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1955'
- TULIP ANGLE:
- 30°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 26.60 MM
- LENGTH IMPERIAL:
- 3.665'
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$54.10 -
KIBBLEWHITE Intake Valve Guide 96-96270
KIBBLEWHITE
$24.89Valve guide wear is one of the most common failure points in high-revving and forced-induction engines, leading to oil consumption, compression loss, and costly engine rebuilds. The KIBBLEWHITE Intake Valve Guide 96-96270 replaces worn guides with...09261715- SKU:
- 09261715
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3958'
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
$24.89 -
KIBBLEWHITE Intake Valve Guide 30-30730
KIBBLEWHITE
$15.92Your engine's intake valves endure extreme temperatures and constant stress, making quality valve guides essential to maintaining proper sealing and preventing wear that can compromise compression and performance. KIBBLEWHITE's Ampco-45 construction...09300019- SKU:
- 09300019
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AMPCO-45
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$15.92
