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
-
KIBBLEWHITE Piston Kit 30-33100
KIBBLEWHITE
$660.02A complete top-end overhaul requires precision components engineered to work in harmony—this kit delivers exactly that. The KIBBLEWHITE 30-33100 pairs high-compression racing internals with premium valve train components, eliminating the guesswork of...09031595- SKU:
- 09031595
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32700
KIBBLEWHITE
$660.02If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32700 is engineered to deliver. The convex valve reliefs are precisely matched to valve geometry, eliminating dangerous piston-to-valve...09031584- SKU:
- 09031584
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32900
KIBBLEWHITE
$660.02If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32900 is the engineered solution purpose-built for high-performance applications. The convex valve reliefs are precision-matched to your...09031585- SKU:
- 09031585
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32600
KIBBLEWHITE
$660.02If you're chasing maximum compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32600 is engineered to deliver. The convex valve reliefs are precisely matched to Black Diamond™ stainless steel valves, eliminating the guesswork of...09031587- SKU:
- 09031587
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 80-81900
KIBBLEWHITE
$736.36Maximizing compression on a high-performance engine demands precision engineering—not guesswork. The KIBBLEWHITE Piston System 80-81900 is purpose-built to safely unlock compression gains through purposely convex valve reliefs that match your valve...09031588- SKU:
- 09031588
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
KIBBLEWHITE Piston System 80-82000
KIBBLEWHITE
$736.36If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 80-82000 is the only engineered solution that gets it right. The convex valve reliefs are geometrically matched to your valve dishes,...09031589- SKU:
- 09031589
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
KIBBLEWHITE Valve Guide 60-60320
KIBBLEWHITE
$19.83Valve guides are critical to maintaining proper valve seating and preventing costly blow-by in high-performance engines. The KIBBLEWHITE 60-60320 uses Ampco-45 bronze to deliver superior heat dissipation and wear resistance—essential for engines running...09260291- SKU:
- 09260291
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4170'
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- C630 BRONZE
- SIZE IMPERIAL:
- STANDARD
$19.83 -
KIBBLEWHITE Valve Spring Kit 30-30880
KIBBLEWHITE
$206.09A high-revving engine demands valve springs engineered for consistent closure under extreme conditions—factory springs often fall short in performance applications. The KIBBLEWHITE Valve Spring Kit 30-30880 delivers the reliability and precision you need...09260293- SKU:
- 09260293
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- INTAKE
- SPRING OPEN PRESSURE:
- 143 LB
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- 0.350'
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- UNITS:
- KIT
$206.09 -
KIBBLEWHITE Intake Valve Guide 30-31470
KIBBLEWHITE
$24.89Valve guide wear is one of the most common causes of compression loss, oil consumption, and cylinder head damage—especially in high-performance and frequently rebuilt engines. The KIBBLEWHITE Intake Valve Guide 30-31470 is engineered from Ampco-45, a...09261132- SKU:
- 09261132
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1961'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.3965'
- UNITS:
- EACH
$24.89 -
KIBBLEWHITE Intake Valve 80-80060
KIBBLEWHITE
$54.10Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE 80-80060 Black Diamond™ valve is engineered to eliminate friction points that rob horsepower while resisting the thermal and...KW8080060- SKU:
- KW8080060
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- UTV
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2355'
- TULIP ANGLE:
- 15°
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.00 MM
- LENGTH IMPERIAL:
- 3.960'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$54.10 -
KIBBLEWHITE Exhaust Valve 80-80063
KIBBLEWHITE
$54.10Exhaust valves are the gatekeepers of your engine's power delivery—a worn or poorly engineered valve can rob you of horsepower, throttle response, and reliability. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers precision engineering and material...KW8080063- SKU:
- KW8080063
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 32.00 MM
- LENGTH IMPERIAL:
- 3.650'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- TULIP ANGLE:
- 25°
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2348'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MODEL:
- BLACK DIAMOND™
$54.10 -
KIBBLEWHITE Intake/Exhaust Valve Guide 80-8010
KIBBLEWHITE
$19.89Valve guide wear is one of the most common failure points in high-performance engines, leading to oil consumption, compression loss, and catastrophic engine damage if left unaddressed. The KIBBLEWHITE Intake/Exhaust Valve Guide 80-8010 uses...KW808010- SKU:
- KW808010
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- OUTSIDE DIAMETER IMPERIAL:
- 0.4942'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.2750'
- MATERIAL:
- AMPCO-45
- RIDING STYLE:
- ATV
$19.89 -
KIBBLEWHITE Exhaust Valve - TRX450R - 31mm 30-30954
KIBBLEWHITE
$31.01Exhaust valves are critical to your TRX450R's engine efficiency—they directly impact combustion timing, heat dissipation, and overall power delivery. The KIBBLEWHITE Black Diamond™ valve replaces OEM components with precision-engineered durability,...09260419- SKU:
- 09260419
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1957'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- LENGTH IMPERIAL:
- 3.310'
$31.01 -
KIBBLEWHITE Intake Valve 30-30120
KIBBLEWHITE
$54.10Intake valve performance directly impacts your engine's breathing efficiency, combustion consistency, and overall power output. The KIBBLEWHITE Black Diamond™ Intake Valve delivers superior wear resistance and reduced friction through precision...KW3030120- SKU:
- KW3030120
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TULIP ANGLE:
- 23°
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.00 MM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- LENGTH IMPERIAL:
- 3.605'
- MATERIAL:
- STAINLESS STEEL
- STEM DIAMETER IMPERIAL:
- 0.2145'
- UNITS:
- EACH
$54.10 -
KIBBLEWHITE Exhaust Valve 30-30122
KIBBLEWHITE
$54.10Exhaust valves are critical components that directly impact engine efficiency, durability, and power output—and inferior valves lead to accelerated wear, carbon buildup, and lost performance. The KIBBLEWHITE Black Diamond™ valve delivers measurable...KW3030122- SKU:
- KW3030122
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH IMPERIAL:
- 3.585'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 29°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- STAINLESS STEEL
- STEM DIAMETER IMPERIAL:
- 0.2140'
- UNITS:
- EACH
$54.10 -
KIBBLEWHITE Valve Guide 30-3030
KIBBLEWHITE
$37.93Valve guide wear is one of the primary culprits behind oil consumption, reduced compression, and poor ring sealing in high-performance engines. The KIBBLEWHITE Valve Guide 30-3030 delivers the thermal conductivity and wear resistance your engine needs to...KW303030- SKU:
- KW303030
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2150'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4355'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- MATERIAL:
- AMPCO-45
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$37.93 -
KIBBLEWHITE Intake Kit 30-31200
KIBBLEWHITE
$190.07If you're running high-revving applications or pushing your engine hard, OEM titanium intake valves wear down quickly—leaving you sidelined during critical races or events. The KIBBLEWHITE 30-31200 Intake Kit replaces those wear-prone components with...09260442- SKU:
- 09260442
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 50 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,345'
- SPRING LIFT IMPERIAL:
- 0.345'
- SPRING OPEN PRESSURE:
- 145 LB
- TYPE:
- CONVERSION
$190.07 -
KIBBLEWHITE Intake Kit 30-31210
KIBBLEWHITE
$185.23If you're running high-RPM applications or extended engine cycles, OEM intake valves become a wear bottleneck that limits both reliability and performance. The KIBBLEWHITE Black Diamond intake kit replaces those components with stainless steel and...09260443- SKU:
- 09260443
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- 147 LB
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
$185.23 -
KIBBLEWHITE Valve Guide 40-40320
KIBBLEWHITE
$17.83Valve guides are critical to maintaining precise valve seating and preventing excessive wear in high-performance engines. The KIBBLEWHITE 40-40320 is engineered with Ampco-45 bronze—a copper-heavy alloy specifically formulated for thermal conductivity...09260449- SKU:
- 09260449
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.4363'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2150'
- MATERIAL:
- C630 BRONZE
- SIZE IMPERIAL:
- STANDARD
$17.83 -
KIBBLEWHITE Intake Valve 30-3115
KIBBLEWHITE
$37.55Precision intake valve flow and reliability demand materials that can withstand extreme combustion pressures and thermal cycling without degradation. KIBBLEWHITE's Black Diamond™ valves are engineered from high-strength EV8 stainless steel and finished...KW303115- SKU:
- KW303115
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- HEAD DIAMETER METRIC:
- 33.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2156'
- LENGTH IMPERIAL:
- 4.040'
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
$37.55
