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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Cylinder Works Standard Bore Cylinder Kit 2016-2018 Suzuki RM-Z250 40004-K03
CYLINDER WORKS
$704.95If your 2016-2018 RM-Z250 is showing signs of wear—loss of compression, increased blow-by, or worn ring grooves—a cylinder kit refresh is essential to restore peak performance and reliability. The Cylinder Works Standard Bore kit delivers OEM-spec...09310675- SKU:
- 09310675
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.75:1
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
$704.95 -
Cylinder Works Standard Bore Cylinder Kit for Yamaha WR250F 2018-2019 20010-K02
CYLINDER WORKS
$750.95When your WR250F's cylinder shows signs of wear—loss of compression, increased blowby, or rough idle—a quality rebuild restores lost power and reliability. The Cylinder Works Standard Bore Kit delivers OEM-spec performance without the fabrication delays...09310676- SKU:
- 09310676
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
$750.95 -
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2017-2019 10010-K01
CYLINDER WORKS
$704.95When your CRF450R's cylinder shows wear, a quality replacement is essential to restore compression, throttle response, and engine reliability. The Cylinder Works Standard Bore Kit delivers factory-spec performance without the downtime and cost of custom...09310713- SKU:
- 09310713
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER:
- 96,00 MM
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-CYCLE
$704.95 -
Cylinder Works High Compression Cylinder Kit for Honda CRF450R 2017-2018 10010-K01HC
CYLINDER WORKS
$773.95If you're running a CRF450R in 2017-2018 spec, a high-compression cylinder kit is one of the most direct ways to unlock measurable power gains without major engine work. This Cylinder Works kit delivers a bolt-on solution that respects OEM tolerances...09310714- SKU:
- 09310714
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$773.95Qty in Cart: 0Quantity:Price:$773.95Subtotal: -
Cylinder Works Standard Bore Cylinder for 2016-2023 KTM 250 SX-F 50006
CYLINDER WORKS
$538.95If you're running a 2016-2023 KTM 250 SX-F, cylinder wear directly impacts throttle response, compression consistency, and overall engine reliability. The Cylinder Works Standard Bore Cylinder replaces a compromised or worn sleeve with...09310716- SKU:
- 09310716
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER:
- 78,00 MM
- ENGINE TYPE:
- 4-CYCLE
$538.95 -
Cylinder Works Standard Bore Cylinder Kit 2016-2023 Husqvarna FC 250 50006-K01
CYLINDER WORKS
$895.95Your FC 250's engine demands precision components that deliver both reliability and performance—this Cylinder Works kit is engineered to meet those demands. By replacing worn or damaged cylinder and piston assemblies with OEM-equivalent parts, you'll...09310717- SKU:
- 09310717
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER:
- 78,00 MM
- ENGINE TYPE:
- 4-CYCLE
- BORE SIZE METRIC:
- 78.00 MM
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$895.95 -
Cylinder Works Cylinder Kit 2021-2022 Gas Gas MC 250F 2021-2022 Gas Gas EX 250F 2016-2022 Husqvarna FC 250 2016-2022 KTM 250 SX-F 2016-2022 KTM 250 XC-F 2015-2016 KTM 250 SX-F FE 50006-K01HC
CYLINDER WORKS
$920.95Factory cylinders wear out—piston slap increases, compression drops, and efficiency suffers. The Cylinder Works 50006-K01HC restores your 250F's engine performance with a direct bolt-on replacement that matches OEM fitment while delivering superior...09310718- SKU:
- 09310718
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.7:1
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
$920.95 -
Cylinder Works Big Bore Cylinder Kit 270cc 2016-2022 KTM 250 SX-F 51006-K01
CYLINDER WORKS
$1,037.95A 270cc big bore kit transforms your 2016-2022 KTM 250 SX-F from a competitive machine into a dominant force on the track. Cylinder Works engineered this kit specifically to deliver measurable power gains without requiring engine teardown or custom...09310719- SKU:
- 09310719
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- ENGINE TYPE:
- 4-CYCLE
- DISPLACEMENT:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 81,00 MM
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$1,037.95 -
Cylinder Works Standard Bore Cylinder Kit 88mm Bore 14:1 Compression Husqvarna FC 350 2016-2018 50007
CYLINDER WORKS
$526.95The FC 350's factory cylinder is durable, but a high-compression big-bore refresh unlocks genuine performance gains—more displacement means more power without forced induction. The Cylinder Works Standard Bore kit delivers a bolt-on upgrade that requires...09310720- SKU:
- 09310720
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
- BORE SIZE METRIC:
- 88.00 MM
- CYLINDER DIAMETER:
- 88,00 MM
- PRODUCT NAME:
- CYLINDER
$526.95 -
Cylinder Works Big Bore Cylinder Kit Kawasaki KX250F 2017-2018 31012-K01
CYLINDER WORKS
$810.95If you're running a 2017-2018 Kawasaki KX250F, a big bore cylinder kit is one of the most direct paths to measurable power gains without a complete engine rebuild. The Cylinder Works Big Bore Kit delivers increased displacement and improved airflow...09310724- SKU:
- 09310724
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$810.95 -
Cylinder Works Standard Bore Cylinder 2017-2019 Kawasaki KX250F 30012
CYLINDER WORKS
$434.95Stock cylinders wear out—and when they do, your KX250F's power delivery suffers. The Cylinder Works Standard Bore cylinder (30012) delivers a direct bolt-on replacement that restores OEM performance without the downtime and expense of re-plating. With...09310725- SKU:
- 09310725
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- UNITS:
- EACH
$434.95Qty in Cart: 0Quantity:Price:$434.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ250F 2014-2015 20010-K01
CYLINDER WORKS
$750.95If your YZ250F's cylinder is showing signs of wear—loss of compression, increased blow-by, or rough running characteristics—a factory-fresh cylinder kit restores that lost performance and reliability. The Cylinder Works Standard Bore Kit delivers a...09310588- SKU:
- 09310588
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 77,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$750.95 -
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX450F 2013-2014 30011-K02
CYLINDER WORKS
$690.95When your KX450F's original cylinder starts showing wear, a quality replacement isn't just about maintaining stock performance—it's about reclaiming the precision and reliability your bike demands. The Cylinder Works Standard Bore Kit delivers a...09310598- SKU:
- 09310598
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$690.95 -
Cylinder Works Standard Bore Cylinder for Polaris RZR 800 2008-2014 60002
CYLINDER WORKS
$635.95Your Polaris RZR 800's cylinder is the foundation of reliable power delivery—and when it shows wear, performance suffers. The Cylinder Works Standard Bore Cylinder restores OEM-level durability without the downtime of sourcing a replacement or paying for...09310604- SKU:
- 09310604
- Availability:
- Ships Same Business Day
- Weight:
- 7.85 LBS
- CYLINDER DIAMETER:
- 80,00 MM
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- PRODUCT NAME:
- CYLINDER
$635.95 -
Cylinder Works Standard Bore Cylinder 93mm 2016 Polaris General 1000 EPS 60003
CYLINDER WORKS
$672.95Your 2016 Polaris General 1000 EPS demands a cylinder that matches factory precision while delivering the durability needed for serious off-road work. The Cylinder Works Standard Bore Cylinder replaces worn or damaged OEM components with a U.S...09310605- SKU:
- 09310605
- Availability:
- Ships Same Business Day
- Weight:
- 7.05 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 93,00 MM
- PRODUCT NAME:
- CYLINDER
- UNITS:
- EACH
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 999 CC
- ENGINE TYPE:
- 4-CYCLE
$672.95Qty in Cart: 0Quantity:Price:$672.95Subtotal: -
Cylinder Works Front Cylinder Kit Kawasaki KVF750 Brute Force 2015-2021 30007-K02
CYLINDER WORKS
$690.95If you're running a KVF750 Brute Force and want to restore or exceed factory cylinder performance without machine work, the Cylinder Works Front Cylinder Kit delivers a complete, bolt-on solution that's ready to install out of the box. Factory cylinders...09310609- SKU:
- 09310609
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- CYLINDER DIAMETER:
- 85,00 MM
- CYLINDER DIAMETER METRIC:
- 85.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 749 CC
- PRODUCT NAME:
- FRONT CYLINDER KIT
$690.95 -
Cylinder Works High Compression Cylinder Kit for Polaris Ranger 800 2011-2014 60002-K02HC
CYLINDER WORKS
$1,145.95Factory Polaris Ranger 800 engines leave performance on the table—this high-compression cylinder kit unlocks measurable gains in power and efficiency without requiring machine work or re-plating. By pairing a big-bore cylinder with matched Vertex pistons...09310617- SKU:
- 09310617
- Availability:
- Ships Same Business Day
- Weight:
- 10.30 LBS
- CYLINDER DIAMETER:
- 80,00 MM
- RIDING STYLE:
- UTV
- STYLE:
- HIGH COMPRESSION
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 769 CC
- RIDING STYLE:
- ATV
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$1,145.95 -
Cylinder Works Big Bore Cylinder Kit for Kawasaki KX250F 2011-2014 31006-K01
CYLINDER WORKS
$790.95Factory cylinders wear out—especially on high-revving 2-stroke competition bikes like the KX250F. The Cylinder Works Big Bore Kit restores lost compression and power while delivering the durability needed for consistent race-day performance. With matched...09310424- SKU:
- 09310424
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 80,00 MM
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
$790.95 -
Cylinder Works Big Bore Cylinder Kit for Yamaha YFZ450 2004-2013 23001-K01
CYLINDER WORKS
$873.95If you're running a YFZ450 and want measurable gains in displacement, power, and torque without the hassle of custom machine work, this big bore kit delivers. The matched Vertex pistons and nickel silicon carbide-plated cylinder work together to reduce...09310425- SKU:
- 09310425
- Availability:
- Ships Same Business Day
- Weight:
- 4.57 LBS
- CYLINDER DIAMETER:
- 105,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- RIDING STYLE:
- ATV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 105.00 MM
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
$873.95 -
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2003-2005 23001-K02
CYLINDER WORKS
$873.95Stock cylinders wear down, robbing your YZ450F of power and reliability. This Cylinder Works big bore kit restores lost performance while maintaining factory aesthetics—no machine shop visits required. You get a complete, ready-to-install solution that...09310426- SKU:
- 09310426
- Availability:
- Ships Same Business Day
- Weight:
- 4.60 LBS
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 478 CC
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 98,00 MM
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
$873.95
