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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LA Sleeve Cylinder Sleeve 48mm Bore Kawasaki KX80 1998-2000 KA5351
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5351, designed to restore performance and extend the life of your cylinders. Crafted from high-quality materials, this replacement sleeve...KA5351- SKU:
- KA5351
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 48.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
$117.95 -
LA Sleeve Cylinder Sleeve for 1998-1999 Kawasaki KX125 54mm Bore KA5354
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5354, a premium quality replacement designed to restore performance and extend the life of your old cylinders. Crafted with precision, this...KA5354- SKU:
- KA5354
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
$131.95 -
LA Sleeve Cylinder Sleeve Kawasaki KX250 2001 66.40mm Bore KA5481
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5481, designed for optimal performance and durability. This high-quality replacement sleeve breathes new life into worn cylinders, ensuring...KA5481- SKU:
- KA5481
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- BORE SIZE METRIC:
- 66.40 MM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1990-1991 Honda CR250R H5105
LA SLEEVE
$148.95The LA SLEEVE Cylinder Sleeve H5105 is designed to rejuvenate your engine's performance by providing a high-quality replacement for worn-out cylinder sleeves. Engineered for durability and precision,...H5105- SKU:
- H5105
- Availability:
- Ships Same Business Day
- Weight:
- 1.44 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95 -
LA Sleeve Cylinder Sleeve for Honda CR250R 1995-1996 H5250
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5250, designed for exceptional durability and performance. These high-quality replacement sleeves breathe new life into aging cylinders,...H5250- SKU:
- H5250
- Availability:
- Ships Same Business Day
- Weight:
- 1.44 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- BORE SIZE METRIC:
- 66.40 MM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$148.95 -
LA Sleeve Cylinder Sleeve 86mm Bore Honda TRX400FW 1995-2003 H5286
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5286, designed to restore performance and extend the life of your old cylinders. Crafted from high-quality materials, these replacement...H5286- SKU:
- H5286
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- CYLINDER SLEEVE
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- RS
- BORE SIZE METRIC:
- 86.00 MM
- UNITS:
- EACH
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1997-1998 Honda CR250R 66.4mm Bore H5318
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5318, designed for optimal performance and durability. This high-quality replacement sleeve is engineered to restore the integrity of your...H5318- SKU:
- H5318
- Availability:
- Ships Same Business Day
- Weight:
- 1.44 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95 -
LA Sleeve Cylinder Sleeve for Suzuki RMX250 1993-1998 FL5271
LA SLEEVE
$153.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5271, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and restores...FL5271- SKU:
- FL5271
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.00 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
$153.95 -
LA SLEEVE Cylinder Sleeve for Suzuki RM85 2002-2008 FL5419
LA SLEEVE
$171.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5419, designed for optimal performance and durability. These high-quality replacement sleeves offer a perfect fit, ensuring your engine...FL5419- SKU:
- FL5419
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
LA Sleeve Cylinder Sleeve 66.40mm Bore 2012 Suzuki RM-Z450 FL5465
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5465, designed to enhance performance and extend the life of your cylinders. Made from high-quality materials, this replacement sleeve...FL5465- SKU:
- FL5465
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 2004-2005 Kawasaki KX125 54mm Bore KA5570
LA SLEEVE
$149.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5570, designed for precision and durability. This high-quality replacement sleeve ensures optimal performance and longevity, making it an...09310157- SKU:
- 09310157
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- ENGINE TYPE:
- 2-STROKE
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal: -
LA Sleeve Cylinder Sleeve for 1988-1990 Kawasaki KX80 KA5041
LA SLEEVE
$117.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5041, designed for optimal performance and durability. This high-quality replacement sleeve ensures a perfect fit and enhances the...09310325- SKU:
- 09310325
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 48.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$117.95Qty in Cart: 0Quantity:Price:$117.95Subtotal: -
LA SLEEVE Cylinder Sleeve for Harley-Davidson 1984-1998 Models FL5374
LA SLEEVE
$143.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5374, designed to restore performance and extend the life of worn cylinders. Crafted with precision and durability in mind, this...09310644- SKU:
- 09310644
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- BORE SIZE METRIC:
- 104.00 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- CHROME-MOLY ALLOY
- UNITS:
- EACH
- COLOR/FINISH:
- ALUMINUM
- DISPLACEMENT:
- 722 CC
- RIDING STYLE:
- STREET
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
$143.95Qty in Cart: 0Quantity:Price:$143.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Kawasaki KX250F 2009-2016 LAS-5611K-1
LA SLEEVE
$375.95Elevate your Kawasaki's performance with the LA SLEEVE Sleeve and Piston Kit, designed for optimal power and efficiency. This comprehensive top-end rebuild kit features advanced materials and...09310519- SKU:
- 09310519
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$375.95Qty in Cart: 0Quantity:Price:$375.95Subtotal: -
LA Sleeve Cylinder Sleeve for Honda XR400R 1996-2004 H5293
LA SLEEVE
$111.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5293, designed to restore performance and extend the lifespan of your cylinders. Crafted from high-quality materials, these sleeves provide...H5293- SKU:
- H5293
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$111.95 -
LA Sleeve Cylinder Sleeve 72mm Bore Polaris Trail Blazer 250 1990-2006 FL5168
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5168, designed to restore performance and extend the lifespan of your old cylinders. Crafted with precision, these high-quality replacement...FL5168- SKU:
- FL5168
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- ALUMINUM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- CI
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$148.95 -
LA Sleeve Cylinder Sleeve Yamaha YZ250 1996 YA5296
LA SLEEVE
$148.95A worn or damaged cylinder sleeve compromises compression, increases blow-by, and accelerates piston ring wear—ultimately robbing your YZ250 of power and reliability. This LA Sleeve replacement...YA5296- SKU:
- YA5296
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Big Bore Cylinder Sleeve for Honda TRX400EX 1999-2008 H5445
LA SLEEVE
$117.95If your TRX400EX is showing signs of cylinder wear—loss of compression, blow-by, or hard starting—a sleeve replacement restores factory performance without the cost of a full engine rebuild. The LA...09310054- SKU:
- 09310054
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- BORE SIZE METRIC:
- 88.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- BIG BORE
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$117.95 -
KIBBLEWHITE Intake Valve Kit 80-80970
KIBBLEWHITE
$261.51Valve train durability is the foundation of reliable engine performance, and OEM titanium intake valves can only take you so far before wear compromises your build. The KIBBLEWHITE Black Diamond...09262678- SKU:
- 09262678
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- SPRING OPEN PRESSURE:
- 151 LB
- TYPE:
- CONVERSION
- MATERIAL:
- TITANIUM
- SPRING LIFT:
- 0,425'
- SPRING SEAT PRESSURE:
- 48 LB
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- SPRING LIFT IMPERIAL:
- 0.425'
$261.51Qty in Cart: 0Quantity:Price:$261.51Subtotal: -
KIBBLEWHITE Valve Spring Kit 96-96400
KIBBLEWHITE
$220.26Valve spring performance is critical to engine reliability and RPM capability—inadequate springs lead to valve float, loss of power, and catastrophic engine damage. The KIBBLEWHITE Valve Spring Kit...09262704- SKU:
- 09262704
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.450'
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 165 LB
- UNITS:
- KIT
$220.26Qty in Cart: 0Quantity:Price:$220.26Subtotal:
