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 Cylinder Head Service Kit 30-33340
KIBBLEWHITE
$411.82Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263120- SKU:
- 09263120
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- TITANIUM
- SPRING OPEN PRESSURE:
- 162 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING SEAT PRESSURE:
- 40 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
$411.82 -
KIBBLEWHITE Cylinder Head Service Kit 30-33350
KIBBLEWHITE
$411.82Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263121- SKU:
- 09263121
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$411.82 -
KIBBLEWHITE Cylinder Head Service Kit 30-33360
KIBBLEWHITE
$420.39Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263122- SKU:
- 09263122
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- SPRING LIFT:
- 0,440'
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
$420.39 -
KIBBLEWHITE Cylinder Head Service Kit 40-41500
KIBBLEWHITE
$453.05Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263123- SKU:
- 09263123
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- SPRING SEAT PRESSURE:
- 46 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
- MATERIAL:
- C630 BRONZE
- SPRING OPEN PRESSURE:
- 155 LB
$453.05 -
KIBBLEWHITE Cylinder Head Service Kit 40-41510
KIBBLEWHITE
$475.16Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263124- SKU:
- 09263124
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- C630 BRONZE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- SPRING OPEN PRESSURE:
- 155 LB
- MATERIAL:
- TITANIUM
- SPRING SEAT PRESSURE:
- 46 LB
- UNITS:
- KIT
$475.16Qty in Cart: 0Quantity:Price:$475.16Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 40-41520
KIBBLEWHITE
$475.16Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263125- SKU:
- 09263125
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- SPRING SEAT PRESSURE:
- 46 LB
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- SPRING OPEN PRESSURE:
- INTAKE 155 LB, EXHAUST 146 LB
$475.16 -
KIBBLEWHITE Cylinder Head Service Kit 40-41470
KIBBLEWHITE
$426.28Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263126- SKU:
- 09263126
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.415'
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,415'
- SPRING OPEN PRESSURE:
- INTAKE 169 LB, EXHAUST 170 LB
- SPRING SEAT PRESSURE:
- INTAKE 64 LB, EXHAUST 65 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$426.28 -
KIBBLEWHITE Cylinder Head Service Kit 40-41480
KIBBLEWHITE
$426.28Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263127- SKU:
- 09263127
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.415'
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,415'
- SPRING OPEN PRESSURE:
- INTAKE 169 LB, EXHAUST 170 LB
- SPRING SEAT PRESSURE:
- INTAKE 64 LB, EXHAUST 65 LB
$426.28 -
KIBBLEWHITE Cylinder Head Service Kit 82-83150
KIBBLEWHITE
$668.26Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263128- SKU:
- 09263128
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- SPRING OPEN PRESSURE:
- 205 LB
- SPRING SEAT PRESSURE:
- 80 IB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,435'
- MATERIAL:
- C630 BRONZE
$668.26 -
KIBBLEWHITE Cylinder Head Service Kit 60-61600
KIBBLEWHITE
$436.00Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263129- SKU:
- 09263129
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- MATERIAL:
- TITANIUM
- SPRING SEAT PRESSURE:
- 51 LB
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT IMPERIAL:
- 0.445'
$436.00 -
KIBBLEWHITE Cylinder Head Service Kit 60-61610
KIBBLEWHITE
$473.53Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263130- SKU:
- 09263130
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,415'
- SPRING LIFT IMPERIAL:
- 0.415'
- SPRING OPEN PRESSURE:
- INTAKE 168 LB, EXHAUST 157 LB
- MATERIAL:
- TITANIUM
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SPRING SEAT PRESSURE:
- INTAKE 61 LB, EXHAUST 56 LB
$473.53 -
KIBBLEWHITE Cylinder Head Service Kit 80-82070
KIBBLEWHITE
$428.22Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263132- SKU:
- 09263132
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT:
- 0,450'
- SPRING LIFT IMPERIAL:
- 0.450'
- SPRING OPEN PRESSURE:
- 155 LB
- SPRING SEAT PRESSURE:
- 46 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- MATERIAL:
- C630 BRONZE
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$428.22 -
KIBBLEWHITE Cylinder Head Service Kit 80-82080
KIBBLEWHITE
$430.91Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263133- SKU:
- 09263133
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- APPLICATION:
- INTAKE
- SPRING SEAT PRESSURE:
- 54 LB
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- UTV
- SPRING LIFT IMPERIAL:
- 0.480'
- MATERIAL:
- C630 BRONZE
- SPRING LIFT:
- 0,480'
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING OPEN PRESSURE:
- 195 LB
$430.91 -
KIBBLEWHITE Cylinder Head Service Kit 80-82090
KIBBLEWHITE
$928.95Kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt/MX and Side x Side models, Cylinder Head Service Kits include the below components:, Lightweight Racing Valve Spring kits with steel or titanium retainers, beehive...09263134- SKU:
- 09263134
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT:
- 0,445'
- MODEL:
- BLACK DIAMOND™
- SPRING SEAT PRESSURE:
- 53 LB
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.445'
- SPRING OPEN PRESSURE:
- 167 LB
- MATERIAL:
- C630 BRONZE
- UNITS:
- KIT
$928.95 -
KIBBLEWHITE Spring Kit - Stainless Steel 30-32440
KIBBLEWHITE
$190.07Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extends the life of the valvetrain and intake components by as much as 4x over the OEM titanium parts, Includes...09262978- SKU:
- 09262978
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT IMPERIAL:
- 0.380'
- SPRING OPEN PRESSURE:
- 160 LB
- TYPE:
- CONVERSION
- PRODUCT NAME:
- VALVE KIT
- SPRING LIFT:
- 0,380'
- RIDING STYLE:
- OFF-ROAD
- SPRING SEAT PRESSURE:
- 51 LB
- UNITS:
- KIT
$190.07 -
KIBBLEWHITE Spring Kit - Stainless Steel 30-31230
KIBBLEWHITE
$185.23Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond intake valves, Extends the life of the valvetrain and intake components by as much as 4x over the OEM titanium parts, Includes...09262979- SKU:
- 09262979
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- SPRING LIFT IMPERIAL:
- 0.440'
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
- UNITS:
- KIT
- SPRING LIFT:
- 0,440'
$185.23 -
KIBBLEWHITE Intake Valve - Standard - CRF250R 2016+ 30-32412
KIBBLEWHITE
$37.55Tensilite® valves are CNC machined from one-piece forgings of 6AL4V or 6-2-4-2 titanium alloy, Finished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistant, Made in the U.S.A.09262981- SKU:
- 09262981
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.50 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1961'
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MODEL:
- TENSILITE®
$37.55 -
On Sale
KIBBLEWHITE Intake Valve 30-32413
KIBBLEWHITE
MSRP: $37.95Now: $24.00Was: $37.95Black Diamond™ valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond™ proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A.09262982- SKU:
- 09262982
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1961'
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.500'
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 31.50 MM
- MODEL:
- BLACK DIAMOND™
MSRP: $37.95Now: $24.00Was: $37.95 -
KIBBLEWHITE Valve Seal Kit 71014-4
KIBBLEWHITE
$13.96All valve seals are made of 100% solid Viton® for long life, Meet or exceed OEM specifications, When using Kibblewhite spring kits, Kibblewhite valve seals must be used because of spring clearances, Made in the U.S.A.09262984- SKU:
- 09262984
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 4.50 MM
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.370'
$13.96 -
KIBBLEWHITE Intake Valve 80-81312
KIBBLEWHITE
$37.55Black Diamond™ valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond™ proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A.09263028- SKU:
- 09263028
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- LENGTH IMPERIAL:
- 3.495'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 31.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1765'
- TULIP ANGLE:
- 15°
$37.55
