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 Intake Valve 30-33662
KIBBLEWHITE
$37.55Intake valve performance directly impacts your engine's breathing efficiency and combustion consistency—two factors that separate competitive lap times from the middle of the pack. The Kibblewhite Black Diamond™ valve eliminates the weak point of stock...09263286- SKU:
- 09263286
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH IMPERIAL:
- 3.280'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- STREET
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 30.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- STEM DIAMETER IMPERIAL:
- 0.1766'
$37.55 -
KIBBLEWHITE Top End Service Kit 30-33700
KIBBLEWHITE
$660.02A complete top-end rebuild demands precision components engineered to withstand extreme combustion pressures and high RPM cycles—this kit delivers all the critical parts in one package, eliminating guesswork and compatibility issues. Whether you're...09263289- SKU:
- 09263289
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- TOP END SERVICE KIT
$660.02 -
KIBBLEWHITE Top End Service Kit 60-61850
KIBBLEWHITE
$660.02A top-end rebuild is one of the most critical investments you can make in your engine's longevity and power output. The KIBBLEWHITE 60-61850 kit eliminates the guesswork by bundling every component you need for a complete, professional-grade...09263290- SKU:
- 09263290
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- TOP END SERVICE KIT
$660.02 -
KIBBLEWHITE Intake Valve Guide 82-82270
KIBBLEWHITE
$18.54Valve guide wear accelerates engine degradation and compromises combustion efficiency—precision replacement guides are essential for maintaining cylinder head integrity and valve sealing performance. KIBBLEWHITE's manganese bronze guides offer superior...09263291- SKU:
- 09263291
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- MATERIAL:
- BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4353'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$18.54 -
KIBBLEWHITE Exhaust Valve Guide 82-82420
KIBBLEWHITE
$18.54Valve guide wear is one of the most common culprits behind oil burning, poor sealing, and accelerated valve stem degradation—and replacing worn guides is essential for any serious engine rebuild. The KIBBLEWHITE 82-82420 exhaust valve guides deliver...09263292- SKU:
- 09263292
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4353'
- APPLICATION:
- EXHAUST
- MATERIAL:
- BRONZE
- SIZE IMPERIAL:
- STANDARD
$18.54Qty in Cart: 0Quantity:Price:$18.54Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 82-83300
KIBBLEWHITE
MSRP: $355.28Now: $227.00Was: $355.28Valve springs are critical to engine reliability—they control valve timing and prevent float at high RPMs, which can cause catastrophic engine failure. The Kibblewhite 82-83300 kit delivers precision-engineered components built to withstand extreme...09263293- SKU:
- 09263293
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.450'
- RIDING STYLE:
- UTV
- APPLICATION:
- EXHAUST
- SPRING OPEN PRESSURE:
- 181 LB
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT:
- 0,450'
- SPRING SEAT PRESSURE:
- 64 LB
- UNITS:
- KIT
MSRP: $355.28Now: $227.00Was: $355.28 -
On Sale
KIBBLEWHITE Valve Spring Kit 82-83350
KIBBLEWHITE
MSRP: $262.77Now: $168.00Was: $262.77A reliable valve spring kit is critical to maintaining consistent performance and preventing catastrophic engine failure—especially under high RPM conditions where valve float can destroy an entire build. The KIBBLEWHITE 82-83350 delivers OEM-quality...09263294- SKU:
- 09263294
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT:
- 0,450'
- TYPE:
- VALVE
- RIDING STYLE:
- UTV
- SPRING SEAT PRESSURE:
- 64 LB
- MATERIAL:
- HIGH TENSILE STEEL
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.450'
- SPRING OPEN PRESSURE:
- 181 LB
MSRP: $262.77Now: $168.00Was: $262.77Qty in Cart: 0Quantity:Price:MSRP: $262.77Now: $168.00Was: $262.77Subtotal: -
KIBBLEWHITE Valve Spring Kit 82-83450
KIBBLEWHITE
$262.77Valve springs are critical to engine reliability—weak or worn springs lead to valve float, loss of compression, and catastrophic engine damage at high RPM. The KIBBLEWHITE Valve Spring Kit 82-83450 delivers the durability and precision needed to maintain...09263296- SKU:
- 09263296
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT:
- 0,450'
- TYPE:
- VALVE
- SPRING OPEN PRESSURE:
- 181 LB
- SPRING SEAT PRESSURE:
- 64 LB
- UNITS:
- KIT
- MATERIAL:
- HIGH TENSILE STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- UTV
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.450'
$262.77Qty in Cart: 0Quantity:Price:$262.77Subtotal: -
KIBBLEWHITE Spring Kit - Steel 80-81700
KIBBLEWHITE
$327.95If you're running a high-lift cam or boosted engine, your stock valve springs simply won't survive sustained RPM. The Kibblewhite Spring Kit steps up valvetrain control with CNC-machined titanium retainers and dual Cr-Si springs engineered to handle...09263206- SKU:
- 09263206
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- SPRING OPEN PRESSURE:
- 167 LB
- RIDING STYLE:
- UTV
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- EXHAUST
- SPRING LIFT:
- 0,445'
- TYPE:
- VALVE
- PRODUCT NAME:
- SPRING KIT
- SPRING SEAT PRESSURE:
- 53 LB
- UNITS:
- KIT
$327.95 -
KIBBLEWHITE Cylinder Head Service Kit 30-33430
KIBBLEWHITE
$466.23A complete cylinder head refresh requires precision components that work in concert—and this kit eliminates the guesswork by bundling everything you need in one box. Whether you're chasing peak horsepower on the track or maintaining reliability in harsh...09263223- SKU:
- 09263223
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- SPRING SEAT PRESSURE:
- 45 LB
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- 0.350'
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,350'
- SPRING OPEN PRESSURE:
- 143 LB
$466.23 -
KIBBLEWHITE Cylinder Head Service Kit 30-33450
KIBBLEWHITE
$412.17A complete cylinder head refresh demands quality components that work in harmony—and this kit delivers exactly that. The KIBBLEWHITE 30-33450 eliminates the guesswork of sourcing individual valve springs, guides, seals, and gaskets by bundling everything...09263224- SKU:
- 09263224
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING SEAT PRESSURE:
- INTAKE 40 LB, EXHAUST 70 LB
- MATERIAL:
- TITANIUM
- 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
$412.17 -
KIBBLEWHITE Cylinder Head Service Kit 30-33490
KIBBLEWHITE
$420.90A complete top-end refresh requires more than piecemeal replacements—this kit delivers everything needed to restore cylinder head performance and reliability in one purchase. Whether you're rebuilding after high-mileage use or upgrading for competition,...09263226- SKU:
- 09263226
- Availability:
- Ships Same Business Day
- Weight:
- 1.96 LBS
- APPLICATION:
- EXHAUST
- SPRING OPEN PRESSURE:
- 185 LB
- SPRING SEAT PRESSURE:
- 70 LB
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT IMPERIAL:
- 0.400'
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- RIDING STYLE:
- STREET
- SPRING LIFT:
- 0,400'
- MATERIAL:
- C630 BRONZE
$420.90 -
KIBBLEWHITE Cylinder Head Service Kit 82-83210
KIBBLEWHITE
$668.26A complete top-end refresh demands precision components that work together as a system—not mismatched aftermarket pieces. The KIBBLEWHITE 82-83210 Cylinder Head Service Kit delivers everything needed to restore flow, durability, and RPM capability on...09263227- SKU:
- 09263227
- Availability:
- Ships Same Business Day
- Weight:
- 2.61 LBS
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING OPEN PRESSURE:
- 205 LB
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- SPRING LIFT:
- 0,435'
- SPRING SEAT PRESSURE:
- 80 IB
$668.26 -
KIBBLEWHITE Cylinder Head Service Kit 82-83220
KIBBLEWHITE
$652.03A top-end refresh demands more than just gaskets—you need valve train components engineered to handle sustained RPMs and temperature spikes that stock components can't tolerate. This Kibblewhite service kit delivers the critical upgrades: racing-grade...09263228- SKU:
- 09263228
- Availability:
- Ships Same Business Day
- Weight:
- 2.56 LBS
- MATERIAL:
- C630 BRONZE
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,435'
- SPRING OPEN PRESSURE:
- 205 LB
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- SPRING SEAT PRESSURE:
- 80 IB
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
$652.03Qty in Cart: 0Quantity:Price:$652.03Subtotal: -
KIBBLEWHITE Valve Spring Kit 82-82550
KIBBLEWHITE
$232.66Valve spring degradation is one of the most common failure points in high-performance engines, leading to loss of compression, misfires, and catastrophic engine damage. The KIBBLEWHITE Valve Spring Kit 82-82550 delivers OEM-quality springs paired with...09263229- SKU:
- 09263229
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- MATERIAL:
- VITON
- SPRING LIFT:
- 0,435'
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- SPRING OPEN PRESSURE:
- 205 LB
- TYPE:
- VALVE
- PRODUCT NAME:
- SPRING KIT
- SPRING SEAT PRESSURE:
- 80 IB
- UNITS:
- KIT
$232.66 -
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
