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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On Sale
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2018-2019 CW20012K01
CYLINDER WORKS
MSRP: $788.95Now: $710.06Was: $788.95Worn cylinder walls and piston wear rob your YZ450F of compression, throttle response, and reliability. The Cylinder Works Standard Bore Kit restores your engine to factory specifications with matched components and precision machining—eliminating...09310849- SKU:
- 09310849
- Availability:
- Ships Same Business Day
- Weight:
- 4.56 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER DIAMETER:
- 97,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
MSRP: $788.95Now: $710.06Was: $788.95 -
On Sale
Cylinder Works 2019-2020 Yamaha WR 450 F High Compression Big Bore Cylinder Kit CW20012K01HC
CYLINDER WORKS
MSRP: $801.95Now: $721.76Was: $801.95If you're running a 2019-2020 WR 450F and want measurable power gains without extensive machine work, this big bore kit delivers real displacement increases that translate directly to torque and acceleration. The ready-to-install design means you're not...09310850- SKU:
- 09310850
- Availability:
- Ships Same Business Day
- Weight:
- 4.51 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.8:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 97,00 MM
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $801.95Now: $721.76Was: $801.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2018-2019 CW21012K01
CYLINDER WORKS
MSRP: $991.95Now: $892.76Was: $991.95The Yamaha YZ450F demands peak performance, and factory cylinders often become the bottleneck in a well-tuned build. This Cylinder Works Big Bore Kit delivers measurable power gains without the downtime of custom machine work—you get bolt-on simplicity...09310851- SKU:
- 09310851
- Availability:
- Ships Same Business Day
- Weight:
- 4.31 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- DISPLACEMENT:
- 470 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 99,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $991.95Now: $892.76Was: $991.95Qty in Cart: 0Quantity:Price:MSRP: $991.95Now: $892.76Was: $991.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K02
CYLINDER WORKS
MSRP: $1,120.95Now: $1,008.86Was: $1,120.95Your Polaris RZR 900's factory cylinder is reliable, but a properly engineered replacement kit unlocks measurable gains in durability, consistency, and longevity. If you're running higher hours, increased boost pressure, or simply want a fresh,...09310852- SKU:
- 09310852
- Availability:
- Ships Same Business Day
- Weight:
- 10.11 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 93,00 MM
- DISPLACEMENT:
- 875 CC
- RIDING STYLE:
- UTV
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- STYLE:
- STANDARD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-CYCLE
MSRP: $1,120.95Now: $1,008.86Was: $1,120.95 -
Cylinder Works High Compression Big Bore Cylinder Kit for Polaris RZR 900 2017-2020 CW60007K01HC
CYLINDER WORKS
$1,218.56If you're running a Polaris RZR 900 and want measurable gains in displacement and compression ratio without extensive machine work, the Cylinder Works High Compression Big Bore Kit delivers the displacement increase and reliability you need. This bolt-on...09310853- SKU:
- 09310853
- Availability:
- Ships Same Business Day
- Weight:
- 10.01 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 875 CC
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 93,00 MM
- RIDING STYLE:
- UTV
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
$1,218.56 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Polaris ACE 900 XC 2017-2019 CW61007K01
CYLINDER WORKS
MSRP: $1,351.95Now: $1,216.76Was: $1,351.95If you're running a Polaris ACE 900 XC and want measurable gains in power and throttle response without extensive engine machine work, the Cylinder Works Big Bore Kit is the most straightforward path forward. This bolt-on upgrade pairs a Nickel Silicon...09310854- SKU:
- 09310854
- Availability:
- Ships Same Business Day
- Weight:
- 9.31 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 98,00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 975 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- RIDING STYLE:
- UTV
MSRP: $1,351.95Now: $1,216.76Was: $1,351.95Qty in Cart: 0Quantity:Price:MSRP: $1,351.95Now: $1,216.76Was: $1,351.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2017 Honda CRF250R 10007-K03
CYLINDER WORKS
MSRP: $609.95Now: $548.96Was: $609.95If your 2016-2017 Honda CRF250R is showing signs of wear on the cylinder or you're rebuilding after a top-end failure, a fresh cylinder kit restores compression and throttle response without the guesswork of sourcing individual components. The Cylinder...09310674- SKU:
- 09310674
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- BORE SIZE METRIC:
- 76.80 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 76,80 MM
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- STYLE:
- STANDARD
MSRP: $609.95Now: $548.96Was: $609.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2018 Suzuki RM-Z250 40004-K03
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $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
MSRP: $704.95Now: $634.46Was: $704.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Yamaha WR250F 2018-2019 20010-K02
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $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
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2017-2019 10010-K01
CYLINDER WORKS
MSRP: $704.95Now: $634.46Was: $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
MSRP: $704.95Now: $634.46Was: $704.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Honda CRF450R 2017-2018 10010-K01HC
CYLINDER WORKS
MSRP: $773.95Now: $696.56Was: $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
MSRP: $773.95Now: $696.56Was: $773.95 -
On Sale
Cylinder Works Standard Bore Cylinder for 2016-2023 KTM 250 SX-F 50006
CYLINDER WORKS
MSRP: $538.95Now: $485.06Was: $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
MSRP: $538.95Now: $485.06Was: $538.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 2016-2023 Husqvarna FC 250 50006-K01
CYLINDER WORKS
MSRP: $895.95Now: $806.36Was: $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
MSRP: $895.95Now: $806.36Was: $895.95 -
On Sale
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
MSRP: $920.95Now: $828.86Was: $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
MSRP: $920.95Now: $828.86Was: $920.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit 270cc 2016-2022 KTM 250 SX-F 51006-K01
CYLINDER WORKS
MSRP: $1,037.95Now: $934.16Was: $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
MSRP: $1,037.95Now: $934.16Was: $1,037.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit 88mm Bore 14:1 Compression Husqvarna FC 350 2016-2018 50007
CYLINDER WORKS
MSRP: $526.95Now: $474.26Was: $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
MSRP: $526.95Now: $474.26Was: $526.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit Kawasaki KX250F 2017-2018 31012-K01
CYLINDER WORKS
MSRP: $810.95Now: $729.86Was: $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
MSRP: $810.95Now: $729.86Was: $810.95 -
On Sale
Cylinder Works Standard Bore Cylinder 2017-2019 Kawasaki KX250F 30012
CYLINDER WORKS
MSRP: $434.95Now: $391.46Was: $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
MSRP: $434.95Now: $391.46Was: $434.95Qty in Cart: 0Quantity:Price:MSRP: $434.95Now: $391.46Was: $434.95Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ250F 2014-2015 20010-K01
CYLINDER WORKS
MSRP: $750.95Now: $675.86Was: $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
MSRP: $750.95Now: $675.86Was: $750.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit Kawasaki KX450F 2013-2014 30011-K02
CYLINDER WORKS
MSRP: $690.95Now: $621.86Was: $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
MSRP: $690.95Now: $621.86Was: $690.95
