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
-
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.-manufactured set engineered specifically for the...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 -
KIBBLEWHITE Intake Valve - Yamaha 80-80073T
KIBBLEWHITE
$92.51Intake valve performance directly impacts cylinder filling efficiency, combustion consistency, and overall engine responsiveness. The Kibblewhite Tensilite® valve engineered for your application uses aerospace-grade titanium and a specialized coating to...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
$92.51 -
KIBBLEWHITE Center Intake Valve - Yamaha 80-80075T
KIBBLEWHITE
$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 characteristics and extended valve life, while the CrN PVD...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
$92.51 -
KIBBLEWHITE Exhaust Valve - Yamaha 80-80077T
KIBBLEWHITE
$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 science beyond standard steel. The KIBBLEWHITE Tensilite®...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
$92.51 -
KIBBLEWHITE Intake Valve - Yamaha 80-80213T
KIBBLEWHITE
$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 precision CNC machining to deliver superior durability...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
$92.51 -
KIBBLEWHITE Center Intake Valve - Yamaha 80-80215T
KIBBLEWHITE
$92.51Intake valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability—especially under sustained high RPM operation. The KIBBLEWHITE Tensilite® Center Intake Valve delivers the material science and precision...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'
$92.51 -
KIBBLEWHITE Exhaust Valve - Yamaha 80-80217T
KIBBLEWHITE
$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 delivers the durability and thermal stability you need...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
$92.51 -
KIBBLEWHITE Intake Valve - Yamaha 80-80762T
KIBBLEWHITE
$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 coating reduces friction loss while resisting impact...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°
$109.33 -
KIBBLEWHITE Intake Valve - Yamaha 80-80872T
KIBBLEWHITE
$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 are precision-forged from premium titanium alloy and...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
$109.33 -
KIBBLEWHITE Exhaust Valve Guide 96-96430
KIBBLEWHITE
$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 consumption and compromised combustion chamber integrity...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
$24.89Qty in Cart: 0Quantity:Price:$24.89Subtotal: -
KIBBLEWHITE Cylinder Head Service Kit 80-82400
KIBBLEWHITE
$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 guesswork by bundling every critical component needed for...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
$556.38 -
KIBBLEWHITE Valve Spring Kit 80-80206
KIBBLEWHITE
$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 durability required for both track and street applications,...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
$317.71 -
KIBBLEWHITE Intake Valve Guide 80-80220
KIBBLEWHITE
$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 alloy to dissipate heat efficiently while resisting the...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
$14.34 -
KIBBLEWHITE Exhaust Valve Guide 80-80230
KIBBLEWHITE
$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 Exhaust Valve Guide 80-80230 uses Ampco-45 compound, a...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
$14.34 -
KIBBLEWHITE Intake Valve 80-80213H
KIBBLEWHITE
$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 a hard chrome coating, these valves resist thermal...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°
$37.55 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - CRF450R 75-1001
K&S TECHNOLOGIES
$33.95Water 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 restore your CRF450R's water pump to OEM specifications...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
$33.95 -
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 Kit supplies all factory-spec seals and O-rings needed to...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 bore engine, ensuring optimal performance and longevity...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 cylinders, ensuring a perfect fit without the need for...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 ensure optimal airflow and combustion. Crafted in the U.S...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
