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 60-60053H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Exhaust valves are the gatekeepers of your engine's breathing cycle—and inferior valves will cost you horsepower, reliability, and race-day consistency. KIBBLEWHITE's White Diamond™ valves are...09263143- SKU:
- 09263143
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.210'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 17°
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1953'
- UNITS:
- EACH
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Exhaust Valve 60-60054H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Exhaust valves endure extreme heat cycles and combustion pressures that demand uncompromising material science—this is where precision engineering separates reliable engines from ones headed for...09263144- SKU:
- 09263144
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SIZE METRIC:
- OVERSIZE
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 30.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 17°
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- STEM DIAMETER IMPERIAL:
- 0.1953'
- LENGTH IMPERIAL:
- 3.210'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Intake Valve 60-60271H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Precision intake valve sealing and durability separate winning builds from mediocre ones. The KIBBLEWHITE White Diamond™ valve delivers the reliability and heat resistance you need for sustained...09263145- SKU:
- 09263145
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH IMPERIAL:
- 3.245'
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1960'
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Exhaust Valve 60-60273H
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01High-RPM combustion demands valves engineered to withstand extreme temperatures and repeated stress cycles without losing integrity. The KIBBLEWHITE White Diamond™ exhaust valve combines precision...09263146- SKU:
- 09263146
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 17°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- STEM DIAMETER IMPERIAL:
- 0.1953'
- LENGTH IMPERIAL:
- 3.210'
- MODEL:
- WHITE DIAMOND™
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Intake Valve Kit 30-32780
KIBBLEWHITE
MSRP: $185.23Now: $166.71Was: $185.23If you're running a high-performance engine, your valvetrain is only as strong as its weakest component. The KIBBLEWHITE Intake Valve Kit 30-32780 replaces OEM titanium parts with forged stainless...09263147- SKU:
- 09263147
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- SPRING LIFT:
- 0,440'
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- 162 LB
- SPRING SEAT PRESSURE:
- 50 LB
- TYPE:
- CONVERSION
- UNITS:
- KIT
MSRP: $185.23Now: $166.71Was: $185.23Qty in Cart: 0Quantity:Price:MSRP: $185.23Now: $166.71Was: $185.23Subtotal: -
On Sale
KIBBLEWHITE Intake Valve Guide 30-32821
KIBBLEWHITE
MSRP: $34.40Now: $30.96Was: $34.40Valve guide wear directly impacts cylinder head integrity, compression stability, and oil consumption—critical factors that separate a well-maintained engine from one headed for failure. The...09263148- SKU:
- 09263148
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4370'
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.001')
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
MSRP: $34.40Now: $30.96Was: $34.40 -
On Sale
KIBBLEWHITE Intake Valve Guide 30-32822
KIBBLEWHITE
MSRP: $30.95Now: $27.86Was: $30.95Valve guide wear directly impacts combustion seal integrity and oil consumption—choosing the right replacement is critical for engine longevity. The KIBBLEWHITE 30-32822 Intake Valve Guide uses...09263149- SKU:
- 09263149
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4380'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- OVERSIZE (+0.002')
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
MSRP: $30.95Now: $27.86Was: $30.95 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 30-32839
KIBBLEWHITE
MSRP: $30.95Now: $27.86Was: $30.95Valve guide wear is one of the most common causes of oil consumption and performance loss in high-mileage engines—and replacing them with precision-engineered components is essential for restoring...09263153- SKU:
- 09263153
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
- OUTSIDE DIAMETER IMPERIAL:
- 0.446'
- UNITS:
- EACH
MSRP: $30.95Now: $27.86Was: $30.95Qty in Cart: 0Quantity:Price:MSRP: $30.95Now: $27.86Was: $30.95Subtotal: -
On Sale
KIBBLEWHITE Intake Valve 40-41412H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Intake valve reliability directly impacts engine efficiency and longevity—especially under high RPM and forced induction conditions. KIBBLEWHITE's White Diamond™ valves are precision-engineered from...09263155- SKU:
- 09263155
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- LENGTH IMPERIAL:
- 3.460'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1764'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 20°
- APPLICATION:
- INTAKE
- UNITS:
- EACH
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Exhaust Valve 40-41416H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55High-revving engines demand exhaust valves that can withstand extreme temperatures and sustained abuse without degradation. The KIBBLEWHITE White Diamond™ valve delivers the durability and precision...09263156- SKU:
- 09263156
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 25.00 MM
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1759'
- LENGTH IMPERIAL:
- 3.170'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
MSRP: $37.55Now: $33.80Was: $37.55 -
On Sale
KIBBLEWHITE Valve Guide 96-96522
KIBBLEWHITE
MSRP: $19.95Now: $17.96Was: $19.95Valve guide wear compromises combustion seal integrity and increases oil consumption—precision engineering is non-negotiable for reliable performance. KIBBLEWHITE's Ampco-45 construction delivers...09263158- SKU:
- 09263158
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4372'
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2353'
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- OVERSIZE (+0.002')
- RIDING STYLE:
- OFF-ROAD
MSRP: $19.95Now: $17.96Was: $19.95Qty in Cart: 0Quantity:Price:MSRP: $19.95Now: $17.96Was: $19.95Subtotal: -
On Sale
KIBBLEWHITE Intake Spring Kit 30-33200
KIBBLEWHITE
MSRP: $198.20Now: $166.71Was: $198.20Factory intake valves wear out—it's physics. The KIBBLEWHITE 30-33200 stainless steel conversion kit replaces them with components engineered to last 4x longer, keeping your valvetrain reliable...09263169- SKU:
- 09263169
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING LIFT:
- 0,440'
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- TYPE:
- CONVERSION
- UNITS:
- KIT
MSRP: $198.20Now: $166.71Was: $198.20 -
On Sale
KIBBLEWHITE Intake Spring Kit 30-33250
KIBBLEWHITE
MSRP: $198.20Now: $166.71Was: $198.20Factory titanium intake valves degrade under sustained high-RPM operation, leading to valve float, loss of compression, and costly head work. The KIBBLEWHITE Intake Spring Kit 30-33250 replaces these...09263170- SKU:
- 09263170
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.440'
- TYPE:
- CONVERSION
- SPRING LIFT:
- 0,440'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- SPRING OPEN PRESSURE:
- 147 LB
- SPRING SEAT PRESSURE:
- 40 LB
- UNITS:
- KIT
MSRP: $198.20Now: $166.71Was: $198.20 -
On Sale
KIBBLEWHITE Spring Kit 80-82300
KIBBLEWHITE
MSRP: $235.67Now: $198.23Was: $235.67A quality valve spring kit is critical for maintaining proper valve seating and preventing float at high RPMs—factors that directly impact engine reliability and performance. The KIBBLEWHITE Spring...09263176- SKU:
- 09263176
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- SPRING OPEN PRESSURE:
- INTAKE 187 LB, EXHAUST 149 LB
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- INTAKE 0.420', EXHAUST 0.400'
- TYPE:
- VALVE
MSRP: $235.67Now: $198.23Was: $235.67 -
On Sale
KIBBLEWHITE Exhaust Valve 80-82316
KIBBLEWHITE
MSRP: $31.01Now: $27.91Was: $31.01Exhaust valves are critical wear components that directly impact engine efficiency, throttle response, and longevity. The KIBBLEWHITE 80-82316 Black Diamond™ valve eliminates common failure points...09263179- SKU:
- 09263179
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 25.00 MM
- LENGTH IMPERIAL:
- 3.235'
- MODEL:
- BLACK DIAMOND™
- TULIP ANGLE:
- 30°
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1760'
MSRP: $31.01Now: $27.91Was: $31.01 -
On Sale
KIBBLEWHITE Intake Valve - Standard - Titanium - YZ250F 80-82312T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Titanium intake valves are essential for high-revving engines where weight reduction directly translates to faster throttle response and improved fuel efficiency. The Kibblewhite Tensilite® valve...09263180- SKU:
- 09263180
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1962'
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 18°
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Exhaust Valve - Standard - Titanium - YZ250F - 2019 80-82316T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Factory exhaust valves are a critical wear item that directly impacts engine breathing and combustion efficiency. A premium titanium replacement like the KIBBLEWHITE Tensilite® valve restores lost...09263181- SKU:
- 09263181
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1760'
- TULIP ANGLE:
- 30°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 25.00 MM
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Intake Valve Guide 80-82320
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92If you're rebuilding a high-mileage engine or restoring a classic, worn valve guides compromise compression, increase oil consumption, and hurt flow efficiency. The KIBBLEWHITE 80-82320 Intake Valve...09263182- SKU:
- 09263182
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- BROWN
- PRODUCT NAME:
- VALVE GUIDE
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1962'
- SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- RIDING STYLE:
- OFF-ROAD
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Intake Valve Guide 80-82329
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92Valve guide wear is one of the most common causes of oil consumption, compression loss, and poor ring sealing in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 80-82329 restores proper...09263185- SKU:
- 09263185
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BRONZE
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.1962'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4057'
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
MSRP: $15.92Now: $14.33Was: $15.92 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 80-82330
KIBBLEWHITE
MSRP: $15.92Now: $14.33Was: $15.92Factory valve guides wear out, causing excess clearance that tanks flow efficiency and invites valve recession—especially in high-mileage or boosted applications. KIBBLEWHITE's C630...09263186- SKU:
- 09263186
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- COLOR/FINISH:
- BRONZE
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- BROWN
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3563'
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- EXHAUST
MSRP: $15.92Now: $14.33Was: $15.92
