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 Cylinder Head Service Kit 82-83240
KIBBLEWHITE
$652.03A worn or stock cylinder head limits your engine's potential—valve float, heat buildup, and poor sealing rob you of power and reliability. The KIBBLEWHITE 82-83240 Cylinder Head Service Kit gives you a complete top-end refresh with race-proven components...09263230- SKU:
- 09263230
- Availability:
- Ships Same Business Day
- Weight:
- 2.61 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING OPEN PRESSURE:
- 205 LB
- SPRING SEAT PRESSURE:
- 80 IB
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- STEEL
- SPRING LIFT IMPERIAL:
- 0.435'
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,435'
$652.03 -
KIBBLEWHITE Cylinder Head Service Kit 60-61790
KIBBLEWHITE
$335.14A complete top-end refresh demands precision components that work together—and this Kibblewhite kit delivers exactly that. Whether you're running dirt bikes, MX machines, or side-by-sides, worn valve springs, guides, and seals rob you of compression,...09263232- SKU:
- 09263232
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- STREET
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.440'
- MATERIAL:
- C630 BRONZE
- MODEL:
- WHITE DIAMOND™
- SPRING OPEN PRESSURE:
- 171 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,440'
- SPRING SEAT PRESSURE:
- 57 LB
$335.14 -
KIBBLEWHITE Valve Spring Kit - Beehive 91-91300
KIBBLEWHITE
$409.48High-revving engines demand valve springs engineered for precision and durability—especially when you're pushing performance limits on track or in competition. The Kibblewhite Beehive 91-91300 kit delivers progressive spring rates designed to maintain...09263317- SKU:
- 09263317
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- APPLICATION:
- EXHAUST
- SPRING OPEN PRESSURE:
- 161 LB
- TYPE:
- VALVE
- STYLE:
- OVATE WIRE BEEHIVE
- UNITS:
- KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- SPRING LIFT IMPERIAL:
- 0.350'
- SPRING SEAT PRESSURE:
- 51 LB
- APPLICATION:
- INTAKE
- COLLAR MATERIAL:
- STEEL
- PRODUCT NAME:
- SPRING KIT
$409.48 -
KIBBLEWHITE Valve Guide - Standard - Intake/Exhaust 91-91320M
KIBBLEWHITE
$14.36Valve guides are critical to maintaining proper valve sealing and preventing excessive oil consumption—a worn guide compromises both performance and engine longevity. The Kibblewhite Standard Valve Guide delivers the thermal conductivity and wear...09263318- SKU:
- 09263318
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3565'
- RIDING STYLE:
- OFF-ROAD
$14.36 -
KIBBLEWHITE Intake Valve - Standard 91-91312H
KIBBLEWHITE
$37.55KIBBLEWHITE's White Diamond™ intake valves are precision-engineered from premium EV8 stainless steel or Inconel-751 forgings to deliver consistent sealing, extended valve life, and reliable performance across high-RPM applications. The 360º electroplated...09263319- SKU:
- 09263319
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.305'
- SIZE METRIC:
- STANDARD
- STEM DIAMETER IMPERIAL:
- 0.1960'
- RIDING STYLE:
- UTV
- HEAD DIAMETER METRIC:
- 29.01 MM
- MODEL:
- WHITE DIAMOND™
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 15°
$37.55 -
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
