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
-
On Sale
KIBBLEWHITE Exhaust Valve 40-40416
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Exhaust valves endure extreme thermal cycling and chemical exposure—factory components often succumb to carbon buildup, corrosion, and premature wear. The Kibblewhite Black Diamond™ Exhaust Valve...09261651- SKU:
- 09261651
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- UTV
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- HEAD DIAMETER METRIC:
- 26.00 MM
- LENGTH IMPERIAL:
- 3.655'
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 10°
- UNITS:
- EACH
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Valve Guide 40-40420
KIBBLEWHITE
MSRP: $19.83Now: $17.85Was: $19.83Valve guide wear is one of the most overlooked causes of oil consumption and compression loss in high-performance engines. The KIBBLEWHITE Valve Guide 40-40420 uses premium Ampco-45 composition to...09261653- SKU:
- 09261653
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- RIDING STYLE:
- UTV
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4160'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $19.83Now: $17.85Was: $19.83 -
On Sale
KIBBLEWHITE Exhaust Valve 60-60210H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valves experience extreme thermal and mechanical stress, and OEM units often succumb to wear, carbon buildup, and corrosion—compromising engine efficiency and reliability. The KIBBLEWHITE...09261656- SKU:
- 09261656
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.120'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1765'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 60-60213H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55If you're building a high-revving engine that demands reliability under extreme conditions, valve quality directly impacts combustion efficiency, longevity, and peak horsepower. KIBBLEWHITE's Black...09261658- SKU:
- 09261658
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 25°
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.115'
- MODEL:
- BLACK DIAMOND™
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Spring Kit - .445" 60-60500
KIBBLEWHITE
MSRP: $220.26Now: $198.23Was: $220.26Valve spring integrity directly impacts engine reliability and performance across the entire RPM band. This KIBBLEWHITE Spring Kit delivers precisely engineered spring rates and damping...09261660- SKU:
- 09261660
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
MSRP: $220.26Now: $198.23Was: $220.26 -
On Sale
KIBBLEWHITE Valve Guide 60-60520
KIBBLEWHITE
MSRP: $17.83Now: $16.05Was: $17.83Valve guide wear is one of the most common failure points in high-performance engines, leading to oil consumption, blow-by, and reduced ring sealing. The KIBBLEWHITE Valve Guide 60-60520 is...09261665- SKU:
- 09261665
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1765'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3778'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
MSRP: $17.83Now: $16.05Was: $17.83 -
On Sale
KIBBLEWHITE Intake Valve Guide 80-80770
KIBBLEWHITE
MSRP: $22.29Now: $20.06Was: $22.29Valve guide wear directly compromises compression, increases oil consumption, and degrades cylinder sealing—all of which kill power and reliability. The KIBBLEWHITE 80-80770 Intake Valve Guide uses...09261687- SKU:
- 09261687
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.2165'
- RIDING STYLE:
- OFF-ROAD
MSRP: $22.29Now: $20.06Was: $22.29 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 80-80780
KIBBLEWHITE
MSRP: $22.29Now: $20.06Was: $22.29Valve guide wear directly compromises combustion chamber seal and engine performance—this KIBBLEWHITE exhaust valve guide maintains precise bore tolerances and thermal stability under sustained...09261688- SKU:
- 09261688
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- NICKEL
- SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- AMPCO-45
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2160'
- MATERIAL:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
MSRP: $22.29Now: $20.06Was: $22.29 -
On Sale
KIBBLEWHITE Intake Valve 82-82155
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Factory intake valves wear down under sustained heat and combustion pressure, robbing your engine of efficiency and reliability. The KIBBLEWHITE Black Diamond™ Intake Valve delivers measurable gains...09261689- SKU:
- 09261689
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MODEL:
- BLACK DIAMOND™
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.72 MM
- LENGTH IMPERIAL:
- 3.775'
- STEM DIAMETER IMPERIAL:
- 0.2160'
- TULIP ANGLE:
- 17°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 82-82158
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valve performance directly impacts engine efficiency, throttle response, and longevity under high RPM conditions. The KIBBLEWHITE Black Diamond™ valve delivers measurable improvements in flow...09261691- SKU:
- 09261691
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 32.44 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.815'
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- TULIP ANGLE:
- 25°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Spring Kit 96-96000
KIBBLEWHITE
MSRP: $181.00Now: $162.90Was: $181.00A precision valve spring kit is fundamental to reliable high-RPM performance and consistent valve timing across the entire powerband. KIBBLEWHITE's engineered spring solution eliminates the risk of...09261696- SKU:
- 09261696
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 214 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- TYPE:
- VALVE
MSRP: $181.00Now: $162.90Was: $181.00 -
On Sale
KIBBLEWHITE Intake Valve 96-96004
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability under sustained high RPM operation. The Kibblewhite Black Diamond™ valve delivers...09261697- SKU:
- 09261697
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 35.00 MM
- LENGTH IMPERIAL:
- 3.815'
- TULIP ANGLE:
- 20°
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve 96-96005
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve performance directly impacts your engine's breathing efficiency and power delivery—a worn or inferior valve compromises combustion quality and throttle response. KIBBLEWHITE's Black...09261698- SKU:
- 09261698
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.815'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
- TULIP ANGLE:
- 20°
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 96-96007
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Valve degradation under extreme combustion temperatures is one of the fastest ways to lose power and reliability in a high-performance engine. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers...09261699- SKU:
- 09261699
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2342'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.815'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- HEAD DIAMETER METRIC:
- 30.00 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $37.55Now: $33.80Was: $37.55Qty in Cart: 0Quantity:Price:MSRP: $37.55Now: $33.80Was: $37.55Subtotal: -
On Sale
KIBBLEWHITE Exhaust Valve 96-96008
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Exhaust valves are among the most thermally stressed and wear-prone components in your engine—they need to withstand extreme temperatures, corrosive combustion byproducts, and thousands of cycles per...09261700- SKU:
- 09261700
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH IMPERIAL:
- 3.815'
- STEM DIAMETER IMPERIAL:
- 0.2342'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- UNITS:
- EACH
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Intake Valve Guide 96-96010
KIBBLEWHITE
MSRP: $22.29Now: $20.06Was: $22.29Valve guide wear is one of the most common causes of oil consumption and performance degradation in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 96-96010 replaces worn guides with a...09261701- SKU:
- 09261701
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
MSRP: $22.29Now: $20.06Was: $22.29 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 96-96020
KIBBLEWHITE
MSRP: $22.29Now: $20.06Was: $22.29Valve guide wear is a silent killer of engine performance, causing increased oil consumption, blow-by, and eventual catastrophic valve failure. The KIBBLEWHITE Exhaust Valve Guide 96-96020 is...09261702- SKU:
- 09261702
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $22.29Now: $20.06Was: $22.29 -
On Sale
KIBBLEWHITE Exhaust Valve 96-96266
KIBBLEWHITE
MSRP: $54.10Now: $48.69Was: $54.10Your engine's exhaust valves endure extreme temperatures and constant stress—factory components often fall short under high-performance demands. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers...09261713- SKU:
- 09261713
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1955'
- TULIP ANGLE:
- 30°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 26.60 MM
- LENGTH IMPERIAL:
- 3.665'
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
MSRP: $54.10Now: $48.69Was: $54.10 -
On Sale
KIBBLEWHITE Intake Valve Guide 96-96270
KIBBLEWHITE
MSRP: $24.89Now: $22.40Was: $24.89Valve guide wear is one of the most common failure points in high-revving and forced-induction engines, leading to oil consumption, compression loss, and costly engine rebuilds. The KIBBLEWHITE...09261715- SKU:
- 09261715
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3958'
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
MSRP: $24.89Now: $22.40Was: $24.89 -
On Sale
KIBBLEWHITE Intake Valve Guide 30-30730
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92Your engine's intake valves endure extreme temperatures and constant stress, making quality valve guides essential to maintaining proper sealing and preventing wear that can compromise compression...09300019- SKU:
- 09300019
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AMPCO-45
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $15.92Now: $14.33Was: $15.92
