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!
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On Sale
Cylinder Works Standard Bore Cylinder for Polaris RZR 800 2008-2014 60002
CYLINDER WORKS
MSRP: $635.95Now: $572.36Was: $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
MSRP: $635.95Now: $572.36Was: $635.95 -
On Sale
Cylinder Works Standard Bore Cylinder 93mm 2016 Polaris General 1000 EPS 60003
CYLINDER WORKS
MSRP: $672.95Now: $605.66Was: $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
MSRP: $672.95Now: $605.66Was: $672.95Qty in Cart: 0Quantity:Price:MSRP: $672.95Now: $605.66Was: $672.95Subtotal: -
On Sale
Cylinder Works Front Cylinder Kit Kawasaki KVF750 Brute Force 2015-2021 30007-K02
CYLINDER WORKS
MSRP: $690.95Now: $621.86Was: $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
MSRP: $690.95Now: $621.86Was: $690.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Polaris Ranger 800 2011-2014 60002-K02HC
CYLINDER WORKS
MSRP: $1,145.95Now: $1,031.36Was: $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
MSRP: $1,145.95Now: $1,031.36Was: $1,145.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Kawasaki KX250F 2011-2014 31006-K01
CYLINDER WORKS
MSRP: $790.95Now: $711.86Was: $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
MSRP: $790.95Now: $711.86Was: $790.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Yamaha YFZ450 2004-2013 23001-K01
CYLINDER WORKS
MSRP: $873.95Now: $786.56Was: $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
MSRP: $873.95Now: $786.56Was: $873.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2003-2005 23001-K02
CYLINDER WORKS
MSRP: $873.95Now: $786.56Was: $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
MSRP: $873.95Now: $786.56Was: $873.95 -
On Sale
CYLINDER WORKS Cylinder - Standard 10002
CYLINDER WORKS
MSRP: $402.95Now: $362.66Was: $402.95OEM cylinder wear compromises ring seal integrity and increases blowby, robbing you of power and reliability. The CYLINDER WORKS Standard 10002 delivers a factory-fresh bore with the durability of nickel silicon carbide plating—all without the downtime...09310129- SKU:
- 09310129
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- COMPRESSION RATIO IMPERIAL:
- 12.1:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
MSRP: $402.95Now: $362.66Was: $402.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Yamaha YZ250F 2005-2007 20002-K02
CYLINDER WORKS
MSRP: $395.95Now: $356.36Was: $395.95If you're running a 2005-2007 Yamaha YZ250F and want to restore or upgrade cylinder performance without machine shop downtime, the Cylinder Works Standard Bore Kit is your direct solution. The nickel silicon carbide plating significantly outlasts stock...09310131- SKU:
- 09310131
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- BORE SIZE METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- 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: $395.95Now: $356.36Was: $395.95 -
On Sale
Cylinder Works Big Bore Kit Honda TRX450R 2004-2005 479cc 10.5:1 11003-K01
CYLINDER WORKS
MSRP: $809.95Now: $728.96Was: $809.95A big bore upgrade is one of the most effective ways to unlock additional displacement and power from your TRX450R without compromising reliability. The Cylinder Works 479cc kit delivers a straightforward bolt-on solution that combines precision...09310133- SKU:
- 09310133
- Availability:
- Ships Same Business Day
- Weight:
- 4.47 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- OVERBORE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
- CYLINDER DIAMETER:
- 97,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 479 CC
- UNITS:
- KIT
MSRP: $809.95Now: $728.96Was: $809.95 -
On Sale
Cylinder Works Yamaha WR450F YFZ450R YZ450F 2007-2014 High Compression Cylinder Kit 20003-K01HC
CYLINDER WORKS
MSRP: $788.95Now: $710.06Was: $788.95If you're running a 2007-2014 Yamaha WR450F, YFZ450R, or YZ450F, a worn or damaged cylinder directly compromises compression, throttle response, and overall engine reliability. The Cylinder Works High Compression Cylinder Kit restores—and improves...09310299- SKU:
- 09310299
- Availability:
- Ships Same Business Day
- Weight:
- 4.38 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 95,00 MM
- STYLE:
- HIGH COMPRESSION
MSRP: $788.95Now: $710.06Was: $788.95 -
On Sale
Cylinder Works High Compression Cylinder Kit for Suzuki LT-R450 2006-2009 40002-K01HC
CYLINDER WORKS
MSRP: $743.95Now: $669.56Was: $743.95If you're serious about extracting more power from your LT-R450, a high-compression cylinder kit is one of the most effective bolt-on upgrades available. This Cylinder Works kit delivers a straightforward path to increased displacement and compression...09310303- SKU:
- 09310303
- Availability:
- Ships Same Business Day
- Weight:
- 4.30 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- HIGH COMPRESSION
- CYLINDER DIAMETER:
- 95,50 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 95.50 MM
- PRODUCT NAME:
- CYLINDER KIT
MSRP: $743.95Now: $669.56Was: $743.95 -
On Sale
Cylinder Works Big Bore Kit Yamaha YZ250F 2001-2013 21002-K01
CYLINDER WORKS
MSRP: $836.95Now: $753.26Was: $836.95If you're running a YZ250F and want to unlock measurable gains in displacement and power output, a big bore kit is one of the most direct upgrades available. The Cylinder Works 21002-K01 delivers a complete, bolt-on solution that eliminates...09310121- SKU:
- 09310121
- Availability:
- Ships Same Business Day
- Weight:
- 3.37 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER:
- 80,00 MM
MSRP: $836.95Now: $753.26Was: $836.95 -
On Sale
CYLINDER WORKS Cylinder - Standard 30001
CYLINDER WORKS
MSRP: $410.95Now: $369.86Was: $410.95A worn or damaged cylinder can severely limit your engine's efficiency and reliability on the track or in the shop. The CYLINDER WORKS Standard 30001 delivers a ready-to-install replacement that matches OEM specifications without requiring costly...09310130- SKU:
- 09310130
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- STYLE:
- STANDARD
- CYLINDER DIAMETER:
- 77,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- BORE SIZE METRIC:
- 77.00 MM
- UNITS:
- EACH
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
Cylinder Works Standard Bore Cylinder for Yamaha YFZ450 2004-2009 2012-2013 20001
CYLINDER WORKS
MSRP: $410.95Now: $369.86Was: $410.95Your YFZ450's cylinder is the foundation of reliable power delivery—when it wears, you lose compression, efficiency, and overall engine performance. The Cylinder Works Standard Bore Cylinder (20001) is a direct bolt-on replacement that restores your...09310132- SKU:
- 09310132
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- CYLINDER DIAMETER:
- 95,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
Cylinder Works Big Bore Kit for Suzuki DR-Z400 2000-2004 41001-K01
CYLINDER WORKS
MSRP: $837.95Now: $754.16Was: $837.95If you're running a stock DR-Z400, you're leaving power on the table. The Cylinder Works Big Bore Kit delivers a straightforward displacement increase with zero guesswork—everything you need arrives matched and ready to bolt on, so you can focus on...09310135- SKU:
- 09310135
- Availability:
- Ships Same Business Day
- Weight:
- 4.44 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.3:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- CYLINDER DIAMETER:
- 94,00 MM
- DISPLACEMENT:
- 434 CC
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- +4.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 94.00 MM
- RIDING STYLE:
- ATV
MSRP: $837.95Now: $754.16Was: $837.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Suzuki DR-Z400S 2000-2022 40001-K01
CYLINDER WORKS
MSRP: $440.95Now: $396.86Was: $440.95The stock cylinder on your DR-Z400S will eventually wear, leading to lost compression, increased blow-by, and sluggish performance. The Cylinder Works Standard Bore Cylinder Kit restores your engine to factory specifications with a bolt-on replacement...09310139- SKU:
- 09310139
- Availability:
- Ships Same Business Day
- Weight:
- 3.61 LBS
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 90,00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- STREET
MSRP: $440.95Now: $396.86Was: $440.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for Honda CRF150R 2012-2020 11004-K02
CYLINDER WORKS
MSRP: $694.95Now: $625.46Was: $694.95If you're running a Honda CRF150R and want measurable gains in displacement and power output, a big bore kit is one of the most direct paths forward. The Cylinder Works 11004-K02 delivers bolt-on simplicity without sacrificing the precision fit and...09310485- SKU:
- 09310485
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 68,00 MM
- DISPLACEMENT:
- 159 CC
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- STYLE:
- BIG BORE
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $694.95Now: $625.46Was: $694.95 -
On Sale
Cylinder Works Big Bore Cylinder Kit for 2009-2015 Kawasaki KX450F 31011-K01
CYLINDER WORKS
MSRP: $786.95Now: $708.26Was: $786.95If you're serious about extracting maximum displacement from your KX450F, the Cylinder Works Big Bore Kit delivers tangible power gains without the machine shop hassle. This bolt-on upgrade pairs a nickel silicon carbide-plated cylinder with Vertex...09310603- SKU:
- 09310603
- Availability:
- Ships Same Business Day
- Weight:
- 3.95 LBS
- DISPLACEMENT:
- 469 CC
- OVERBORE METRIC:
- +2.00 MM
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-CYCLE
MSRP: $786.95Now: $708.26Was: $786.95 -
On Sale
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR XP 900 2011-2013 60001-K02
CYLINDER WORKS
MSRP: $1,204.95Now: $1,084.46Was: $1,204.95When your RZR XP 900's engine is ready for more, a complete cylinder kit eliminates the guesswork and delivers measurable gains in displacement and reliability. This Cylinder Works kit arrives as a true bolt-on solution—no machine work, no...09310657- SKU:
- 09310657
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.6:1
- CYLINDER DIAMETER:
- 93,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 875 CC
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
MSRP: $1,204.95Now: $1,084.46Was: $1,204.95
