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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On Sale
KIBBLEWHITE Exhaust Valve Guide 80-82339
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92If you're building or rebuilding a high-performance engine, valve guide quality directly impacts cylinder head durability and flow efficiency. The KIBBLEWHITE 80-82339 is precision-machined from C630...09263189- SKU:
- 09263189
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3663'
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Valve Guide Seal Kit - 4 pack 80-82345
KIBBLEWHITE
MSRP: $13.96Now: $12.56Was: $13.96Valve guide seals are critical to controlling oil consumption and maintaining compression in your engine—worn seals allow oil to seep past valve guides, contaminating the combustion chamber and...09263190- SKU:
- 09263190
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- TYPE:
- VALVE GUIDE
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
MSRP: $13.96Now: $12.56Was: $13.96 -
On Sale
KIBBLEWHITE Intake Valve 82-82255
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity—making quality valve selection critical for any high-revving application. The KIBBLEWHITE...09263279- SKU:
- 09263279
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH IMPERIAL:
- 3.765'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 34.42 MM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.2160'
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 17°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve - Titanium - CRF250 - 2018-2020 30-33612T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Maximize your CRF250's combustion efficiency with a precision-engineered intake valve built for aggressive riding demands. Kibblewhite's titanium construction delivers a significant weight reduction...09263283- SKU:
- 09263283
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- HEAD DIAMETER METRIC:
- 33.00 MM
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 16°
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1961'
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Exhaust Valve - Titanium - CRF250 - 2018-2020 30-33616T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Titanium exhaust valves are essential for high-revving engines where stock valves can't withstand repeated thermal and mechanical stress. The Kibblewhite Tensilite® valve reduces reciprocating mass,...09263284- SKU:
- 09263284
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1956'
- TULIP ANGLE:
- 18°
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Valve Spring Kit 30-33650
KIBBLEWHITE
MSRP: $229.93Now: $206.94Was: $229.93If you're running a high-lift cam or forced induction setup, your stock valve springs are a liability. The KIBBLEWHITE 30-33650 kit delivers the spring rates and valve control needed to keep your...09263285- SKU:
- 09263285
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- RIDING STYLE:
- STREET
- SPRING LIFT:
- 0,390'
- SPRING SEAT PRESSURE:
- 49 LB
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.390'
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
MSRP: $229.93Now: $206.94Was: $229.93 -
On Sale
KIBBLEWHITE Intake Valve 30-33662
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $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...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'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Top End Service Kit 30-33700
KIBBLEWHITE
MSRP: $706.21Now: $594.02Was: $706.21A 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...09263289- SKU:
- 09263289
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- TOP END SERVICE KIT
MSRP: $706.21Now: $594.02Was: $706.21 -
On Sale
KIBBLEWHITE Top End Service Kit 60-61850
KIBBLEWHITE
MSRP: $660.02Now: $594.02Was: $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...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
MSRP: $660.02Now: $594.02Was: $660.02 -
On Sale
KIBBLEWHITE Intake Valve Guide 82-82270
KIBBLEWHITE
MSRP: $18.54Now: $16.69Was: $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...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
MSRP: $18.54Now: $16.69Was: $18.54 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 82-82420
KIBBLEWHITE
MSRP: $18.54Now: $16.69Was: $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...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
MSRP: $18.54Now: $16.69Was: $18.54 -
On Sale
KIBBLEWHITE Valve Spring Kit 82-83300
KIBBLEWHITE
MSRP: $355.28Now: $319.75Was: $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...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: $319.75Was: $355.28Qty in Cart: 0Quantity:Price:MSRP: $355.28Now: $319.75Was: $355.28Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 82-83450
KIBBLEWHITE
MSRP: $262.77Now: $236.49Was: $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...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'
MSRP: $262.77Now: $236.49Was: $262.77Qty in Cart: 0Quantity:Price:MSRP: $262.77Now: $236.49Was: $262.77Subtotal: -
On Sale
KIBBLEWHITE Spring Kit - Steel 80-81700
KIBBLEWHITE
MSRP: $327.95Now: $295.16Was: $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...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
MSRP: $327.95Now: $295.16Was: $327.95 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 30-33430
KIBBLEWHITE
MSRP: $498.86Now: $419.61Was: $498.86A 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...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
MSRP: $498.86Now: $419.61Was: $498.86 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 30-33450
KIBBLEWHITE
MSRP: $441.02Now: $370.95Was: $441.02A 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...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
MSRP: $441.02Now: $370.95Was: $441.02Qty in Cart: 0Quantity:Price:MSRP: $441.02Now: $370.95Was: $441.02Subtotal: -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 30-33490
KIBBLEWHITE
MSRP: $450.36Now: $378.81Was: $450.36A 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...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
MSRP: $450.36Now: $378.81Was: $450.36Qty in Cart: 0Quantity:Price:MSRP: $450.36Now: $378.81Was: $450.36Subtotal: -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 82-83210
KIBBLEWHITE
MSRP: $668.26Now: $601.43Was: $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...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
MSRP: $668.26Now: $601.43Was: $668.26 -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 82-83220
KIBBLEWHITE
MSRP: $652.03Now: $586.83Was: $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...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'
MSRP: $652.03Now: $586.83Was: $652.03Qty in Cart: 0Quantity:Price:MSRP: $652.03Now: $586.83Was: $652.03Subtotal: -
On Sale
KIBBLEWHITE Valve Spring Kit 82-82550
KIBBLEWHITE
MSRP: $232.66Now: $209.39Was: $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...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
MSRP: $232.66Now: $209.39Was: $232.66
