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 Spring Kit 30-30015
KIBBLEWHITE
$156.91Valve spring integrity is critical to engine reliability, especially in high-RPM applications where stock springs can't handle sustained load cycles. The KIBBLEWHITE Spring Kit 30-30015 delivers precise spring rates and titanium upper collars engineered...KW3030015- SKU:
- KW3030015
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING OPEN PRESSURE:
- 185 LB
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
- SPRING LIFT IMPERIAL:
- 0.400'
- UNITS:
- KIT
$156.91 -
KIBBLEWHITE Intake Valve 30-3003
KIBBLEWHITE
$37.55If you're building a high-revving engine or restoring a race-proven platform, intake valve quality directly impacts combustion efficiency, thermal management, and long-term reliability. KIBBLEWHITE's Black Diamond™ valves are engineered to withstand...KW303003- SKU:
- KW303003
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- LENGTH IMPERIAL:
- 4.165'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 23°
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2590'
$37.55 -
KIBBLEWHITE Exhaust Valve 30-3004
KIBBLEWHITE
$37.55Valve degradation directly impacts combustion efficiency, throttle response, and engine longevity—especially under sustained high-RPM operation. The KIBBLEWHITE Black Diamond™ Exhaust Valve (30-3004) combats this with precision engineering and material...KW303004- SKU:
- KW303004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2585'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 31.00 MM
- LENGTH IMPERIAL:
- 4.095'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 29°
$37.55 -
KIBBLEWHITE Spring Kit 30-30077
KIBBLEWHITE
$130.65A quality valve spring kit is fundamental to reliable engine performance, and the KIBBLEWHITE Spring Kit 30-30077 delivers the precision engineering required for consistent valve train operation across a wide range of applications. Whether you're...KW3030077- SKU:
- KW3030077
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.355'
- SPRING OPEN PRESSURE:
- 150 LB
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
$130.65 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC320
KIBBLEWHITE
$8.62Valve seat recession and microwelding failures can compromise engine reliability and performance in high-demand applications. The KIBBLEWHITE Cast Iron Valve Seat 10-SC320 uses advanced powdered metal technology to deliver exceptional hardness and...09261633- SKU:
- 09261633
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- INSIDE DIAMETER METRIC:
- 24.00 MM
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 32.00 MM
- OUTSIDE DIAMETER METRIC:
- 32.00 MM
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
$8.62 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC330
KIBBLEWHITE
$8.75Valve seat recession and microwelding are silent killers in high-rpm applications—they compromise combustion sealing and accelerate wear, especially under boost or alternative fuels. The KIBBLEWHITE Cast Iron Valve Seat 10-SC330 is engineered with a...09261634- SKU:
- 09261634
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- HEAD DIAMETER METRIC:
- 33.00 MM
- INSIDE DIAMETER METRIC:
- 24.00 MM
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER METRIC:
- 33.00 MM
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
$8.75 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC340
KIBBLEWHITE
$8.89Valve seat recession and microwelding are silent killers of engine durability, especially in high-rpm and forced induction applications. Kibblewhite's cast iron valve seats use advanced powdered metal technology to deliver uniform hardness and...09261635- SKU:
- 09261635
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 34.00 MM
- PRODUCT NAME:
- VALVE SEAT
- INSIDE DIAMETER METRIC:
- 26.00 MM
- MATERIAL:
- STEEL
- HEAD DIAMETER METRIC:
- 34.00 MM
- RIDING STYLE:
- OFF-ROAD
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
$8.89 -
KIBBLEWHITE Intake Valve 30-30221
KIBBLEWHITE
$31.01Intake valve performance directly impacts combustion efficiency, throttle response, and overall engine reliability—especially under high RPM conditions where factory valves often fall short. The KIBBLEWHITE Black Diamond™ 30-30221 delivers superior...20080221- SKU:
- 20080221
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH IMPERIAL:
- 3.325'
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- STEM DIAMETER IMPERIAL:
- 0.2158'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 37.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
$31.01 -
KIBBLEWHITE Exhaust Valve 30-30223
KIBBLEWHITE
$31.01Exhaust valves are critical to engine reliability and performance—they're exposed to extreme heat and wear cycles that demand uncompromising durability. The KIBBLEWHITE Black Diamond™ valve delivers the precision engineering and material quality required...20080223- SKU:
- 20080223
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- LENGTH IMPERIAL:
- 3.310'
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1957'
- TULIP ANGLE:
- 20°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
$31.01 -
KIBBLEWHITE Spring Kit 40-40100
KIBBLEWHITE
$220.26A valve spring kit is fundamental to any serious engine build—weak or worn springs compromise valve timing, reduce horsepower, and accelerate component wear. The KIBBLEWHITE Spring Kit 40-40100 delivers the precision engineering and durability required...09260167- SKU:
- 09260167
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 155 LB
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.445'
$220.26 -
KIBBLEWHITE Intake Valve - KX/RMZ - Standard 40-40140H
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency and engine responsiveness—particularly critical on KX/RMZ platforms where precision tolerances demand uncompromising quality. KIBBLEWHITE's Black Diamond™ valves combine superior metallurgy...09260170- SKU:
- 09260170
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1765'
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.120'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- RIDING STYLE:
- OFF-ROAD
$37.55 -
KIBBLEWHITE Exhaust Valve - KX/RMZ - Standard 40-40143H
KIBBLEWHITE
$37.55Exhaust valves are engineered for extreme abuse—constant thermal cycling, combustion pressures, and high RPMs demand materials that won't degrade. The Kibblewhite Black Diamond™ valve gives you factory-proven durability with measurably reduced friction,...09260172- SKU:
- 09260172
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TULIP ANGLE:
- 25°
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.125'
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 25.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Intake Valve 80-80214H
KIBBLEWHITE
$37.55Intake valve performance directly impacts your engine's breathing efficiency, combustion timing, and overall power output. KIBBLEWHITE's White Diamond™ valves eliminate the weak link in your cylinder head with precision engineering and superior materials...09260107- SKU:
- 09260107
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 28.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 15°
- UNITS:
- EACH
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1765'
- LENGTH IMPERIAL:
- 3.030'
- SIZE METRIC:
- OVERSIZE
$37.55 -
KIBBLEWHITE Intake Valve 80-80215H
KIBBLEWHITE
$37.55When you're pushing peak RPMs on track, valve integrity becomes non-negotiable. KIBBLEWHITE's White Diamond™ intake valves are precision-forged from premium EV8 stainless steel or Inconel-751, then hard chrome plated to withstand extreme heat cycles and...09260108- SKU:
- 09260108
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STEM DIAMETER IMPERIAL:
- 0.1765'
- HEAD DIAMETER METRIC:
- 27.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- APPLICATION:
- CENTER INTAKE
- LENGTH IMPERIAL:
- 3.000'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MODEL:
- WHITE DIAMOND™
- TULIP ANGLE:
- 15°
$37.55 -
KIBBLEWHITE Intake Valve 80-80216H
KIBBLEWHITE
$37.55If you're serious about top-end reliability and consistent performance, valve quality directly impacts your engine's ability to sustain high RPMs and maintain precise combustion timing. KIBBLEWHITE's White Diamond™ intake valves are engineered to...09260109- SKU:
- 09260109
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- STEM DIAMETER IMPERIAL:
- 0.1765'
- APPLICATION:
- CENTER INTAKE
- LENGTH IMPERIAL:
- 2.990'
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 28.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- OVERSIZE
- TULIP ANGLE:
- 15°
$37.55 -
KIBBLEWHITE Exhaust Valve 80-80218H
KIBBLEWHITE
$37.55High-revving engines demand valve integrity that won't compromise under extreme heat and pressure. KIBBLEWHITE's White Diamond™ exhaust valves deliver the durability and precision tolerances that separate reliable performance from catastrophic failure...09260111- SKU:
- 09260111
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH IMPERIAL:
- 2.945'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1956'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 29.00 MM
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- OVERSIZE
- TULIP ANGLE:
- 20°
$37.55 -
KIBBLEWHITE Spring Kit 80-80066
KIBBLEWHITE
$317.71A quality valve spring kit is fundamental to reliable engine performance, especially if you're pushing higher RPMs or running forced induction. The KIBBLEWHITE Spring Kit 80-80066 delivers the consistent valve control and durability required for serious...09260112- SKU:
- 09260112
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.380'
- SPRING OPEN PRESSURE:
- 86 LB
$317.71 -
KIBBLEWHITE Intake Valve Guide 80-80080
KIBBLEWHITE
$15.92Valve guide wear is one of the primary culprits behind oil consumption, rough idle, and lost compression in high-performance engines. The KIBBLEWHITE Intake Valve Guide 80-80080 replaces worn guides with precision-engineered components that restore seal...09260113- SKU:
- 09260113
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- MATERIAL:
- C630 BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1570'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3563'
- SIZE IMPERIAL:
- STANDARD
$15.92 -
KIBBLEWHITE Exhaust Valve Guide 80-80090
KIBBLEWHITE
$15.92Valve guides are critical to engine longevity—they control oil consumption, maintain precise valve timing, and prevent catastrophic engine wear. The KIBBLEWHITE 80-80090 exhaust valve guide delivers superior heat dissipation and durability through...09260118- SKU:
- 09260118
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3958'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
$15.92 -
KIBBLEWHITE Intake Valve - YZ250F - Standard 80-80073
KIBBLEWHITE
$37.55The YZ250F demands intake valves that can handle sustained high RPM cycles without sacrificing precision or durability. KIBBLEWHITE's Black Diamond™ valves are purpose-built from premium EV8 stainless steel and engineered to minimize friction while...09260123- SKU:
- 09260123
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 23.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1568'
- LENGTH IMPERIAL:
- 3.150'
- TULIP ANGLE:
- 25°
$37.55
