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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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...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
$873.95Qty in Cart: 0Quantity:Price:$873.95Subtotal:
