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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MOOSE RACING Top End Gasket Kit - CR450/480R 810270
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or leak under pressure. The MOOSE RACING Top End Gasket Kit eliminates guesswork with a complete, U.S...M810270- SKU:
- M810270
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33 -
On Sale
KIBBLEWHITE Intake Valve - Yamaha 80-80073T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Intake valve performance directly impacts cylinder filling efficiency, combustion consistency, and overall engine responsiveness. The Kibblewhite Tensilite® valve engineered for your application uses...09262762- SKU:
- 09262762
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 23.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1570'
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 25°
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Center Intake Valve - Yamaha 80-80075T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Tensilite® intake valves deliver the reliability and thermal stability your engine demands during high-RPM operation. Precision CNC machining from titanium alloy forgings ensures consistent flow...09262763- SKU:
- 09262763
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- HEAD DIAMETER METRIC:
- 23.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1570'
- TULIP ANGLE:
- 25°
- APPLICATION:
- CENTER INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
MSRP: $92.51Now: $83.26Was: $92.51Qty in Cart: 0Quantity:Price:MSRP: $92.51Now: $83.26Was: $92.51Subtotal: -
On Sale
KIBBLEWHITE Exhaust Valve - Yamaha 80-80077T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Exhaust valves are critical components that directly impact engine efficiency, durability, and peak performance—and they're exposed to extreme temperatures and repeated impact that demand material...09262764- SKU:
- 09262764
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 24.50 MM
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 25°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1758'
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Intake Valve - Yamaha 80-80213T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Intake valve performance directly impacts your engine's breathing efficiency, combustion consistency, and overall power output. The Kibblewhite Tensilite® valve combines aerospace-grade titanium with...09262765- SKU:
- 09262765
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 15°
- UNITS:
- EACH
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1765'
- MATERIAL:
- TITANIUM
- HEAD DIAMETER METRIC:
- 27.00 MM
- PRODUCT NAME:
- VALVE
MSRP: $92.51Now: $83.26Was: $92.51Qty in Cart: 0Quantity:Price:MSRP: $92.51Now: $83.26Was: $92.51Subtotal: -
On Sale
KIBBLEWHITE Center Intake Valve - Yamaha 80-80215T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Intake valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability—especially under sustained high RPM operation. The KIBBLEWHITE Tensilite® Center...09262766- SKU:
- 09262766
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 27.00 MM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- CENTER INTAKE
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 15°
- MATERIAL:
- TITANIUM
- STEM DIAMETER IMPERIAL:
- 0.1765'
MSRP: $92.51Now: $83.26Was: $92.51 -
On Sale
KIBBLEWHITE Exhaust Valve - Yamaha 80-80217T
KIBBLEWHITE
MSRP: $92.51Now: $83.26Was: $92.51Exhaust valves are critical to engine reliability and peak performance—especially under high-RPM and high-heat conditions where material failure becomes a real risk. The KIBBLEWHITE Tensilite® valve...09262767- SKU:
- 09262767
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 28.00 MM
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1957'
- APPLICATION:
- EXHAUST
MSRP: $92.51Now: $83.26Was: $92.51Qty in Cart: 0Quantity:Price:MSRP: $92.51Now: $83.26Was: $92.51Subtotal: -
On Sale
KIBBLEWHITE Intake Valve - Yamaha 80-80762T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Precision intake flow depends on valve quality, and Kibblewhite's Tensilite® valves are engineered to deliver exact tolerances and superior durability under extreme combustion pressures. The CrN PVD...09262768- SKU:
- 09262768
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2160'
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- MODEL:
- TENSILITE®
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Intake Valve - Yamaha 80-80872T
KIBBLEWHITE
MSRP: $109.33Now: $98.40Was: $109.33Intake valve performance directly impacts cylinder filling efficiency and combustion consistency—two critical factors that separate competitive engines from the rest. KIBBLEWHITE's Tensilite® valves...09262770- SKU:
- 09262770
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.00 MM
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 18°
- MATERIAL:
- TITANIUM
- STEM DIAMETER IMPERIAL:
- 0.2160'
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
MSRP: $109.33Now: $98.40Was: $109.33 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 96-96430
KIBBLEWHITE
MSRP: $24.89Now: $22.40Was: $24.89Valve guides are critical to maintaining proper valve sealing and preventing oil blow-by in high-performance engines. Factory guides wear quickly under racing conditions, leading to increased oil...09262711- SKU:
- 09262711
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- STANDARD
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- MATERIAL:
- AMPCO-45
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- NICKEL
- MATERIAL:
- STAINLESS STEEL
MSRP: $24.89Now: $22.40Was: $24.89Qty in Cart: 0Quantity:Price:MSRP: $24.89Now: $22.40Was: $24.89Subtotal: -
On Sale
KIBBLEWHITE Cylinder Head Service Kit 80-82400
KIBBLEWHITE
MSRP: $556.38Now: $500.74Was: $556.38A complete cylinder head refresh requires precision components that work together—not a collection of aftermarket parts that compromise reliability. The KIBBLEWHITE 80-82400 Service Kit eliminates...09263233- SKU:
- 09263233
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- MATERIAL:
- C630 BRONZE
- MATERIAL:
- TITANIUM
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- STREET
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.380'
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CYLINDER HEAD SERVICE KIT
- SPRING LIFT:
- 0,380'
- SPRING SEAT PRESSURE:
- 39 LB
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 86 LB
- UNITS:
- KIT
MSRP: $556.38Now: $500.74Was: $556.38 -
On Sale
KIBBLEWHITE Valve Spring Kit 80-80206
KIBBLEWHITE
MSRP: $317.71Now: $285.94Was: $317.71High-revving engines demand valve springs engineered to handle sustained pressure and extreme RPM cycles without failure. The KIBBLEWHITE 80-80206 Valve Spring Kit delivers the reliability and...09260095- SKU:
- 09260095
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- RIDING STYLE:
- ATV
- SPRING LIFT IMPERIAL:
- 0.380'
- SPRING OPEN PRESSURE:
- 86 LB
- SPRING LIFT:
- 0,380'
- SPRING SEAT PRESSURE:
- 39 LB
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $317.71Now: $285.94Was: $317.71 -
On Sale
KIBBLEWHITE Intake Valve Guide 80-80220
KIBBLEWHITE
MSRP: $14.34Now: $12.91Was: $14.34Valve guide wear is one of the most common causes of oil consumption and reduced ring sealing in high-performance engines. The KIBBLEWHITE Intake Valve Guide 80-80220 is engineered with Ampco-45...09260096- SKU:
- 09260096
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- C630 BRONZE
- SIZE IMPERIAL:
- STANDARD
- INSIDE DIAMETER IMPERIAL:
- 0.1768'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $14.34Now: $12.91Was: $14.34 -
On Sale
KIBBLEWHITE Exhaust Valve Guide 80-80230
KIBBLEWHITE
MSRP: $14.34Now: $12.91Was: $14.34Valve guides are critical wear items that directly impact engine reliability and performance—poor guides lead to valve recession, oil consumption, and catastrophic engine failure. The KIBBLEWHITE...09260101- SKU:
- 09260101
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER IMPERIAL:
- 0.1961'
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.3957'
- UNITS:
- EACH
MSRP: $14.34Now: $12.91Was: $14.34 -
On Sale
KIBBLEWHITE Intake Valve 80-80213H
KIBBLEWHITE
MSRP: $37.55Now: $33.80Was: $37.55Kibblewhite's White Diamond™ intake valves deliver the reliability and durability your engine demands under extreme conditions. Built from premium EV8 stainless steel or Inconel-751 and finished with...09260106- SKU:
- 09260106
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 27.00 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.040'
- MODEL:
- WHITE DIAMOND™
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1765'
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 15°
MSRP: $37.55Now: $33.80Was: $37.55 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - CRF450R 75-1001
K&S TECHNOLOGIES
$36.95Water pump failures don't wait for convenient timing—they strand you trackside or leave your engine at risk of catastrophic damage. This K&S Technologies gasket kit gives you everything needed to...09341909- SKU:
- 09341909
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$36.95 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - CRF250R 75-1002
K&S TECHNOLOGIES
$36.95A failing water pump gasket kit leads to coolant leaks, overheating, and potential engine damage—problems that compound quickly on the track or trail. The K&S Technologies Water Pump Repair Gasket...09341910- SKU:
- 09341910
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- PRODUCT NAME:
- GASKET KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
Cylinder Works Big Bore Gasket Kit 2016-2018 Husqvarna FC350 KTM 350 SX-F 350 XC-F 51007-G01
CYLINDER WORKS
$135.95Enhance your engine's performance with the CYLINDER WORKS Gasket Kit Big Bore 51007-G01, proudly made in the U.S.A. This high-quality gasket kit is designed to provide a perfect seal for your big...09346006- SKU:
- 09346006
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- OVERSIZE (+2.00 MM)
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CYLINDER
$135.95 -
Cylinder Works Honda CRF450X 2005-2017 Standard Bore Cylinder 10008
CYLINDER WORKS
$421.95Upgrade your ride with the CYLINDER WORKS Cylinder Standard 10008, designed for seamless installation and optimal performance. This direct bolt-on cylinder mirrors the quality and appearance of OEM...09311013- SKU:
- 09311013
- Availability:
- Ships Same Business Day
- Weight:
- 3.51 LBS
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
$421.95 -
Cylinder Works Cylinder Head Kit Kawasaki KX250F 2006-2008 CH3001-K01
CYLINDER WORKS
$688.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit. Designed for enthusiasts seeking enhanced power and efficiency, this kit features precision-engineered components that...09311018- SKU:
- 09311018
- Availability:
- Ships Same Business Day
- Weight:
- 5.51 LBS
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$688.95
