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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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
$14.34Qty in Cart: 0Quantity:Price:$14.34Subtotal: -
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: -
On Sale
Cylinder Works Big Bore Gasket Kit 2016-2018 Husqvarna FC350 KTM 350 SX-F 350 XC-F 51007-G01
CYLINDER WORKS
MSRP: $135.95Now: $122.36Was: $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
MSRP: $135.95Now: $122.36Was: $135.95 -
On Sale
Cylinder Works Honda CRF450X 2005-2017 Standard Bore Cylinder 10008
CYLINDER WORKS
MSRP: $421.95Now: $379.76Was: $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
MSRP: $421.95Now: $379.76Was: $421.95 -
On Sale
Cylinder Works Cylinder Head Kit Kawasaki KX250F 2006-2008 CH3001-K01
CYLINDER WORKS
MSRP: $688.95Now: $620.06Was: $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
MSRP: $688.95Now: $620.06Was: $688.95 -
On Sale
Cylinder Works Cylinder Head Kit 2004-2006 Suzuki RM-Z250 CH3002-K01
CYLINDER WORKS
MSRP: $685.95Now: $617.36Was: $685.95Upgrade your engine's performance with the CYLINDER WORKS Cylinder Head Kit Standard Bore CH3002-K01. This high-quality replacement cylinder head is expertly designed to enhance airflow and optimize combustion, ensuring your engine runs efficiently and...09311019- SKU:
- 09311019
- Availability:
- Ships Same Business Day
- Weight:
- 5.46 LBS
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- UNITS:
- KIT
MSRP: $685.95Now: $617.36Was: $685.95Qty in Cart: 0Quantity:Price:MSRP: $685.95Now: $617.36Was: $685.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Yamaha YZ450F 2020 CW20014
CYLINDER WORKS
MSRP: $421.95Now: $379.76Was: $421.95Upgrade your engine's performance with the CYLINDER WORKS Standard CW20014. This ready-to-install, direct bolt-on cylinder is designed to fit seamlessly with your existing setup, offering durability and reliability without the need for re-plating...09311020- SKU:
- 09311020
- Availability:
- Ships Same Business Day
- Weight:
- 3.56 LBS
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER:
- 97,00 MM
- STYLE:
- STANDARD
MSRP: $421.95Now: $379.76Was: $421.95 -
On Sale
Cylinder Works Cylinder for KTM 250 SX-F 2013-2015 250 XC-F 2013-2015 250 XCF-W 2014 50004
CYLINDER WORKS
MSRP: $526.95Now: $474.26Was: $526.95Enhance your engine's performance with the Cylinder Works Standard 50004. Designed for seamless installation, these direct bolt-on cylinders offer a perfect fit without the need for re-plating. Crafted with Nickel Silicon Carbide plating, they ensure...09310492- SKU:
- 09310492
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- BORE SIZE METRIC:
- 77.95 MM
- CYLINDER DIAMETER:
- 78,00 MM
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- UNITS:
- EACH
MSRP: $526.95Now: $474.26Was: $526.95Qty in Cart: 0Quantity:Price:MSRP: $526.95Now: $474.26Was: $526.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder for Yamaha YZ450F 2010-2017 20005
CYLINDER WORKS
MSRP: $547.95Now: $493.16Was: $547.95Upgrade your YZ450F with our premium Cylinder Works Cylinder, designed for seamless installation and exceptional performance. Crafted with precision, this cylinder offers the reliability and durability you expect, enhancing your riding experience without...09310396- SKU:
- 09310396
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- BORE SIZE METRIC:
- 97.00 MM
- CYLINDER DIAMETER:
- 97,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- UNITS:
- EACH
MSRP: $547.95Now: $493.16Was: $547.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kawasaki KX250F 2009 30004
CYLINDER WORKS
MSRP: $421.95Now: $379.76Was: $421.95Enhance your KX250F's performance with our premium Cylinder Works Standard Cylinder. Designed for easy installation, this cylinder provides a perfect fit and mimics the original equipment manufacturer (OEM) specifications, ensuring a seamless upgrade...09310398- SKU:
- 09310398
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
MSRP: $421.95Now: $379.76Was: $421.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kawasaki KX250F 2010 30005
CYLINDER WORKS
MSRP: $434.95Now: $391.46Was: $434.95Experience unmatched performance with the Cylinder Works Standard Cylinder for the KX250F 2010. Designed for easy installation, this direct bolt-on replacement offers the durability and efficiency you expect from top-tier components. With its advanced...09310399- SKU:
- 09310399
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
MSRP: $434.95Now: $391.46Was: $434.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kawasaki KX250F 2011-2012 30006
CYLINDER WORKS
MSRP: $421.95Now: $379.76Was: $421.95Upgrade your KX250F with our high-quality Cylinder Works Cylinder, designed for seamless installation and exceptional performance. Engineered to match OEM specifications, this cylinder offers durability and reliability without the need for re-plating...09310400- SKU:
- 09310400
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
MSRP: $421.95Now: $379.76Was: $421.95 -
On Sale
Cylinder Works Standard Bore Cylinder for KTM 350 SX-F 2011-2012 50001
CYLINDER WORKS
MSRP: $526.95Now: $474.26Was: $526.95Upgrade your ride with the CYLINDER WORKS Standard Cylinder for the KTM350 SX-F. Designed for effortless installation, this high-performance cylinder combines durability and precision to enhance your bike's power and efficiency. With its OEM-like...09310403- SKU:
- 09310403
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE SIZE METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
MSRP: $526.95Now: $474.26Was: $526.95 -
On Sale
Cylinder Works Standard Bore Cylinder KTM 250 SX-F 2005-2012 50002
CYLINDER WORKS
MSRP: $526.95Now: $474.26Was: $526.95Upgrade your ride with the CYLINDER WORKS Cylinder for KTM250 and 50002, designed for seamless installation and optimal performance. Crafted in the U.S.A., this cylinder combines durability with precision engineering, ensuring your bike runs like new...09310404- SKU:
- 09310404
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- CYLINDER DIAMETER:
- 76,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- BORE SIZE METRIC:
- 76.00 MM
- CYLINDER DIAMETER METRIC:
- 76.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $526.95Now: $474.26Was: $526.95
