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
$411.82A complete cylinder head refresh demands precision components that work in concert—and this kit delivers exactly that. KIBBLEWHITE's Cylinder Head Service Kit 30-33340 bundles everything needed to restore your dirt bike or side-by-side's top end to...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
$411.82A complete top-end refresh demands quality components engineered for reliability and performance—this kit delivers everything needed to restore or upgrade your cylinder head in one purchase. Whether you're rebuilding after wear or chasing incremental...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
$411.82Qty in Cart: 0Quantity:Price:$411.82Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 30-33360
KIBBLEWHITE
$420.39A complete top-end refresh requires precision components engineered to withstand extreme temperatures and sustained RPMs—this kit delivers every critical component in one package. Whether you're rebuilding after a season or upgrading for competitive...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
$453.05A complete top-end refresh demands quality components that work together as a system—not mismatched parts thrown at a problem. The KIBBLEWHITE Cylinder Head Service Kit 40-41500 eliminates guesswork by bundling race-proven valve springs, guides, and...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
$475.16A complete cylinder head refresh demands quality components that work together as a system—not a collection of mismatched parts. The KIBBLEWHITE 40-41510 Service Kit eliminates guesswork by pairing proven valve springs, durable guides, and OEM-spec...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
$475.16A complete cylinder head refresh demands more than piecemeal replacements—you need matched, precision components engineered to work together. The KIBBLEWHITE Cylinder Head Service Kit 40-41520 eliminates the guesswork by bundling everything required for...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
$426.28A complete top-end refresh demands precision components engineered to handle sustained high RPM operation. The KIBBLEWHITE Cylinder Head Service Kit 40-41470 delivers everything needed to restore or upgrade your cylinder head with OEM-quality gaskets and...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
$426.28A complete top-end refresh requires precision components engineered to withstand high RPM loads and thermal stress. The KIBBLEWHITE Cylinder Head Service Kit 40-41480 delivers everything needed to restore flow efficiency, valve sealing integrity, and...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
$668.26A worn or stock cylinder head limits your engine's potential and reliability under racing conditions. The KIBBLEWHITE 82-83150 Cylinder Head Service Kit gives you everything needed for a complete top-end refresh with race-proven components that improve...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
$436.00A complete cylinder head refresh demands precision components that work in concert—and this kit delivers exactly that. The KIBBLEWHITE 60-61600 eliminates the guesswork of sourcing individual top-end parts, giving you validated, race-proven components...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
$473.53A complete top-end refresh demands precision components that restore flow, durability, and reliable power delivery. The KIBBLEWHITE Cylinder Head Service Kit consolidates everything needed to upgrade your dirt bike or side-by-side's cylinder head in one...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
$473.53Qty in Cart: 0Quantity:Price:$473.53Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 80-82070
KIBBLEWHITE
$428.22A complete cylinder head refresh isn't just maintenance—it's the foundation for reliable power and longevity in high-rev environments. The Kibblewhite 80-82070 eliminates the guesswork by pairing premium valve springs, durable bronze guides, and...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
$430.91A complete cylinder head refresh demands precision components that work together—not a collection of mismatched parts. The KIBBLEWHITE 80-82080 Service Kit eliminates guesswork by bundling everything needed to restore flow, durability, and reliability in...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
$430.91Qty in Cart: 0Quantity:Price:$430.91Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 80-82090
KIBBLEWHITE
$928.95A complete cylinder head refresh demands precision components that work in harmony—and this Kibblewhite service kit eliminates the guesswork by bundling everything needed for a professional-grade top-end rebuild. Whether you're refreshing a high-mileage...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
$928.95Qty in Cart: 0Quantity:Price:$928.95Subtotal: -
KIBBLEWHITE Spring Kit - Stainless Steel 30-32440
KIBBLEWHITE
$190.07Stock titanium intake valves wear down quickly under sustained high RPM operation, compromising engine reliability and forcing costly rebuilds. The Kibblewhite Spring Kit converts your cylinder head to forged stainless steel Black Diamond intake valves,...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
$185.23If you're running high-RPM applications or extended engine cycles, your OEM intake valvetrain is likely limiting both performance and longevity. The KIBBLEWHITE Spring Kit upgrades your cylinder head to stainless steel Black Diamond intake valves and...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
$37.55Factory intake valves wear faster than any other valve in your CRF250R, leading to compression loss and sluggish throttle response. The Kibblewhite Tensilite® intake valve restores precision fit and durability with a premium titanium forging that...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: $37.95The KIBBLEWHITE Black Diamond™ Intake Valve delivers the precision and durability demanded by high-performance engines. Its single-piece forging eliminates weak points, while the proprietary multi-stage friction-reduction process ensures reliable...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
$13.96Valve seal degradation leads to oil consumption, blue smoke, and loss of compression—issues that compound quickly in high-performance engines. The KIBBLEWHITE Valve Seal Kit 71014-4 delivers OEM-exceeding durability with 100% solid Viton® construction,...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
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE Black Diamond™ valve delivers measurable gains through precision engineering and superior materials, reducing friction while...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
