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
-
MOOSE RACING Oil Filter Cover - Kawasaki T14-2300GB
MOOSE RACING
$32.95Keeping engine oil at optimal temperature is critical for consistent performance and longevity, especially during extended track sessions or high-RPM driving. The MOOSE RACING Oil Filter Cover...09401940- SKU:
- 09401940
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- OIL FILTER
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
SHINDY Needle Bearing - 16 mm x 21 mm x 19.5 mm 10-251
SHINDY
$9.95Piston pin needle bearings are critical to engine reliability, directly affecting power transfer and reducing friction at one of the most stressed points in your engine. A worn or inadequate bearing...NB1463- SKU:
- NB1463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- INSIDE DIAMETER METRIC:
- 16 MM
- LENGTH METRIC:
- 19.5 MM
- TYPE:
- NEEDLE
- INSIDE DIAMETER:
- 16 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- LENGTH:
- 19,5 MM
- OUTSIDE DIAMETER:
- 21 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 21 MM
- UNITS:
- EACH
$9.95 -
LA Sleeve Cylinder Sleeve 1993 Suzuki RM125 FL5181
LA SLEEVE
$131.95If your RM125's cylinder is worn, scored, or has lost compression, a cylinder sleeve is your path to restored performance without a complete engine teardown. The LA SLEEVE FL5181 restores your bore...FL5181- SKU:
- FL5181
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$131.95 -
LA Sleeve Cylinder Sleeve 77mm Bore Yamaha YZ250F 2004-2013 WR250F 2004-2013 YA5536
LA SLEEVE
$108.95A worn cylinder bore directly kills engine compression, throttle response, and fuel efficiency—problems that compound quickly in high-stress riding conditions. The LA SLEEVE YA5536 restores your...09310265- SKU:
- 09310265
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 77.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal: -
LA Sleeve Cylinder Rebuild Kit for 2005-2007 Honda CR85R CR85RB Expert LAS-5599K
LA SLEEVE
$312.95When your Honda CR85R or CR85RB's top-end starts losing compression and power, a sleeve and piston kit is the most cost-effective path to full engine restoration. The LA Sleeve Moly2000 design...09310382- SKU:
- 09310382
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- MATERIAL:
- CAST
$312.95Qty in Cart: 0Quantity:Price:$312.95Subtotal: -
Cylinder Works Big Bore Gasket Kit for 2016-2023 KTM 250 SX-F 81mm Bore 51006-G01
CYLINDER WORKS
$158.95When you've invested in a big bore kit for your 2016-2023 KTM 250 SX-F, compromising on gaskets undermines everything you've gained. The Cylinder Works Big Bore Gasket Kit ensures complete sealing...09346005- SKU:
- 09346005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- OVERSIZE (+3.00 MM)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$158.95 -
Cylinder Works Standard Bore Cylinder Kit for Honda CRF450R 2019 10010-K02
CYLINDER WORKS
$677.95If you're running a stock Honda CRF450R cylinder, you're leaving performance and reliability on the table. The Cylinder Works Standard Bore Kit delivers a complete, bolt-on refresh that restores your...09310840- SKU:
- 09310840
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
$677.95Qty in Cart: 0Quantity:Price:$677.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Polaris General 1000 2017-2019 61006-K01
CYLINDER WORKS
$1,309.95If you're running a Polaris General 1000 and want measurable power gains without engine teardown, the Cylinder Works Big Bore Kit delivers displacement and compression in one bolt-on package. The...09310844- SKU:
- 09310844
- Availability:
- Ships Same Business Day
- Weight:
- 9.65 LBS
- DISPLACEMENT:
- 1110 CC
- RIDING STYLE:
- UTV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-CYCLE
$1,309.95Qty in Cart: 0Quantity:Price:$1,309.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit Honda CRF450R 2019 10010-K02
CYLINDER WORKS
$421.95Your Honda CRF450R's cylinder endures constant thermal stress and high-RPM wear—a worn or damaged cylinder compromises compression, power delivery, and overall engine reliability. The Cylinder Works...09310712- SKU:
- 09310712
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$421.95Qty in Cart: 0Quantity:Price:$421.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit CRF 450 R 2017-2018 11010-K01
CYLINDER WORKS
$886.95If you're looking to unlock genuine performance gains from your CRF 450 R without compromise, the Cylinder Works Big Bore Kit delivers measurable improvements in displacement, combustion efficiency,...09310715- SKU:
- 09310715
- Availability:
- Ships Same Business Day
- Weight:
- 4.25 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- STANDARD
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER:
- 99,00 MM
- ENGINE TYPE:
- 4-CYCLE
$886.95 -
Cylinder Works Standard Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 50007-K01
CYLINDER WORKS
$888.95If your 2016-2018 KTM 350 SX-F is showing signs of wear—loss of compression, increased blow-by, or declining power delivery—a fresh cylinder kit is the most direct path to restoring race-ready...09310721- SKU:
- 09310721
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- CYLINDER DIAMETER:
- 88,00 MM
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
$888.95 -
Cylinder Works Cylinder Kit Husqvarna FC 350 2016-2018 50007-K01HC
CYLINDER WORKS
$834.95A worn or damaged cylinder compromises your FC 350's power delivery and reliability—especially in competitive or high-mileage applications. The Cylinder Works kit delivers a complete,...09310722- SKU:
- 09310722
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- CYLINDER DIAMETER:
- 88,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- STYLE:
- STANDARD
$834.95Qty in Cart: 0Quantity:Price:$834.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for 2016-2018 KTM 350 SX-F 366cc 14.0:1 Compression 90mm 51007-K01
CYLINDER WORKS
$866.95If you're running a 2016-2018 KTM 350 SX-F and want measurable gains in peak power and mid-range response without a complete engine rebuild, this big bore kit delivers. By stepping displacement from...09310723- SKU:
- 09310723
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- CYLINDER DIAMETER:
- 90,00 MM
- DISPLACEMENT:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- STYLE:
- BIG BORE
$866.95Qty in Cart: 0Quantity:Price:$866.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2014-2017 21005-K02
CYLINDER WORKS
$834.95The stock cylinder in your 2014-2017 YZ450F limits your engine's potential—this big bore kit unlocks measurable horsepower and torque gains while maintaining reliability. By increasing displacement...09310590- SKU:
- 09310590
- Availability:
- Ships Same Business Day
- Weight:
- 4.40 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- DISPLACEMENT:
- 468 CC
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- +2.00 MM
- CYLINDER DIAMETER:
- 99,00 MM
$834.95Qty in Cart: 0Quantity:Price:$834.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit for Yamaha WR250F 2015-2019 21010-K01
CYLINDER WORKS
$771.95If you're serious about maximizing your WR250F's potential, a big bore cylinder kit is one of the most direct paths to measurable power gains. The Cylinder Works Big Bore Kit delivers increased...09310591- SKU:
- 09310591
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 269 CC
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- CYLINDER DIAMETER:
- 80,00 MM
$771.95Qty in Cart: 0Quantity:Price:$771.95Subtotal: -
Cylinder Works Rear Cylinder Kit Kawasaki KVF750 Brute Force 2015-2020 30008-K02
CYLINDER WORKS
$639.95If you're running a Kawasaki KVF750 Brute Force, cylinder wear directly impacts power delivery, fuel efficiency, and overall reliability. The Cylinder Works Rear Cylinder Kit restores your engine to...09310611- SKU:
- 09310611
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 85.00 MM
- PRODUCT NAME:
- REAR CYLINDER KIT
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 85,00 MM
- DISPLACEMENT:
- 749 CC
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- STANDARD
$639.95Qty in Cart: 0Quantity:Price:$639.95Subtotal: -
Cylinder Works Standard Bore Cylinder Kit for Polaris RZR XP 1000 2014-2015 60003-K02
CYLINDER WORKS
$1,093.95When your RZR XP 1000 demands more power and reliability, a worn or damaged cylinder becomes the bottleneck to peak performance. The Cylinder Works Standard Bore Kit delivers a direct bolt-on...09310618- SKU:
- 09310618
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- CYLINDER DIAMETER:
- 93,00 MM
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 93.00 MM
- DISPLACEMENT:
- 999 CC
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- STYLE:
- STANDARD
$1,093.95 -
Cylinder Works CRF 450 R 2013-2016 Standard Bore Cylinder Kit 10006-K02
CYLINDER WORKS
$717.95When your CRF 450 R's original cylinder shows signs of wear—scoring, loss of compression, or increased blow-by—a quality rebuild kit is your path back to reliable power delivery. The Cylinder Works...09310489- SKU:
- 09310489
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 96,00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$717.95Qty in Cart: 0Quantity:Price:$717.95Subtotal: -
Cylinder Works Yamaha YFM700R Raptor 2006-2014 Standard Bore Cylinder Kit 20004-K01
CYLINDER WORKS
$842.95When your YFM700R's original cylinder shows signs of wear or you're ready to unlock additional displacement, the Cylinder Works Standard Bore Kit delivers a complete, bolt-on solution without...09310379- SKU:
- 09310379
- Availability:
- Ships Same Business Day
- Weight:
- 8.34 LBS
- PRODUCT NAME:
- CYLINDER KIT
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- CYLINDER DIAMETER:
- 102,00 MM
- CYLINDER DIAMETER METRIC:
- 102.00 MM
- UNITS:
- KIT
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 686 CC
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- RIDING STYLE:
- ATV
$842.95 -
DEL WEST Exhaust Valve DW-YZ250F-EV14
DEL WEST
$171.95When you're pushing a YZ250F to its limits in competition, valve reliability directly impacts your race results. DEL WEST exhaust valves are engineered to withstand the extreme temperatures and...09262721- SKU:
- 09262721
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal:
