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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MOOSE RACING Complete Motor Gasket Kit - KX500 808470
MOOSE RACING
$64.22Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M808470- SKU:
- M808470
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$64.22Qty in Cart: 0Quantity:Price:$64.22Subtotal: -
MOOSE RACING Top End Gasket Kit - XR650L 810281
MOOSE RACING
$70.25Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810281- SKU:
- M810281
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.25 -
LA Sleeve Cylinder Sleeve for 2001 Kawasaki KX125 KA5451
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5451, designed for optimal performance and durability. This high-quality replacement sleeve restores the integrity of worn cylinders, ensuring your machinery runs smoothly and efficiently...KA5451- SKU:
- KA5451
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$131.95 -
LA Sleeve Cylinder Sleeve for Kawasaki KX250 2002-2003 66.40mm Bore KA5471
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve KA5471, a high-quality replacement designed to restore performance and extend the life of your old cylinders. Crafted with precision engineering, this sleeve ensures a perfect fit and optimal...KA5471- SKU:
- KA5471
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 66.40mm Bore Honda CR250R 2001 H5448
LA SLEEVE
$148.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5448, designed for optimal performance and durability. This high-quality replacement sleeve offers a perfect fit for your old cylinders, ensuring they operate like new. Engineered for...H5448- SKU:
- H5448
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- AC
- BORE SIZE METRIC:
- 66.40 MM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- UNITS:
- EACH
$148.95 -
KIBBLEWHITE Valve Guide 40-40120
KIBBLEWHITE
$17.70All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Made in the U.S.A.09260168- SKU:
- 09260168
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.1760'
- SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3765'
- PRODUCT NAME:
- VALVE GUIDE
$17.70 -
KIBBLEWHITE Exhaust Valve 80-80217H
KIBBLEWHITE
$37.55White Diamond™ valves are CNC machined from one-piece forgings of EV8 Stainless Steel or Inconel-751, Electroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finish, Made in the U.S.A.09260110- SKU:
- 09260110
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 28.00 MM
- LENGTH IMPERIAL:
- 2.955'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- STANDARD
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MODEL:
- WHITE DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1956'
$37.55 -
KIBBLEWHITE Intake Valve - Honda 30-30220T
KIBBLEWHITE
$92.51Tensilite® valves are CNC machined from one-piece forgings of 6AL4V or 6-2-4-2 titanium alloy, Finished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistant, Made in the U.S.A.09262743- SKU:
- 09262743
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.2158'
- HEAD DIAMETER METRIC:
- 36.00 MM
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
$92.51Qty in Cart: 0Quantity:Price:$92.51Subtotal: -
KIBBLEWHITE Intake Valve - Honda 30-31262T
KIBBLEWHITE
$109.33Tensilite® valves are CNC machined from one-piece forgings of 6AL4V or 6-2-4-2 titanium alloy, Finished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistant, Made in the U.S.A.09262744- SKU:
- 09262744
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- HEAD DIAMETER METRIC:
- 36.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1960'
$109.33Qty in Cart: 0Quantity:Price:$109.33Subtotal: -
KIBBLEWHITE Intake Valve - Suzuki 60-60512T
KIBBLEWHITE
$109.33Tensilite® valves are CNC machined from one-piece forgings of 6AL4V or 6-2-4-2 titanium alloy, Finished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistant, Made in the U.S.A.09262758- SKU:
- 09262758
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 15°
- HEAD DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1765'
$109.33Qty in Cart: 0Quantity:Price:$109.33Subtotal: -
On Sale
Cylinder Works Big Bore Gasket Kit Honda CRF450R 2017-2018 11010-G01
CYLINDER WORKS
MSRP: $70.65Now: $63.59Was: $70.65Elevate your engine's performance with the CYLINDER WORKS Gasket Kit Big Bore 11010-G01, proudly made in the U.S.A. This high-quality gasket kit is designed to ensure optimal sealing and durability, making it an essential upgrade for any serious rider...09346004- SKU:
- 09346004
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- CYLINDER
- BORE SIZE IMPERIAL:
- OVERSIZE (+3.00 MM)
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DIAMETER METRIC:
- 99.00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $70.65Now: $63.59Was: $70.65Qty in Cart: 0Quantity:Price:MSRP: $70.65Now: $63.59Was: $70.65Subtotal: -
On Sale
Cylinder Works Standard Bore Cylinder for Kawasaki KX85 2006-2013 30009
CYLINDER WORKS
MSRP: $543.95Now: $489.56Was: $543.95Enhance your machine's performance with the CYLINDER WORKS Cylinder Standard 30009, a premium direct bolt-on solution that ensures seamless installation and optimal functionality. Crafted to meet or exceed OEM specifications, this cylinder is designed...09310580- SKU:
- 09310580
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-CYCLE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $543.95Now: $489.56Was: $543.95Qty in Cart: 0Quantity:Price:MSRP: $543.95Now: $489.56Was: $543.95Subtotal: -
POWERSTANDS RACING Oil Cap Kit - Blue - M20 x 1.5 00-01310-25
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500561- SKU:
- 09500561
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- CAP KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COLOR/FINISH:
- BLUE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- OIL FILLER
- DIAMETER - THREAD SIZE IMPERIAL:
- M20 X 1.5
$31.95 -
POWERSTANDS RACING Oil Cap Kit - Blue - M20 x 2.5 00-01311-25
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500563- SKU:
- 09500563
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- CAP KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLUE
- UNITS:
- KIT
- TYPE:
- OIL FILLER
- DIAMETER - THREAD SIZE IMPERIAL:
- M20 X 2.5
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
$31.95 -
SHINDY Needle Bearing - 18 mm x 23 mm x 24 mm 10-101
SHINDY
$10.95Piston pin needle cage bearings are manufactured from precision bearings and high-quality housing material, Each bearing is packaged in an individual box for easy identificationNB1452- SKU:
- NB1452
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- LENGTH:
- 24 MM
- LENGTH METRIC:
- 24 MM
- OUTSIDE DIAMETER METRIC:
- 23 MM
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER:
- 23 MM
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- INSIDE DIAMETER:
- 18 MM
- INSIDE DIAMETER METRIC:
- 18 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$10.95 -
Wossner Piston Kit KTM 250 2005-2025 8169DC
WOSSNER
$152.00Experience superior performance with the WOSSNER Piston Kit 8169DC, expertly crafted for 2-stroke engines. This high-quality piston kit is designed to enhance engine efficiency, reduce friction, and deliver a quieter ride. Engineered in Germany, each...09104863- SKU:
- 09104863
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - YZ80 808612
MOOSE RACING
$36.47Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M808612- SKU:
- M808612
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$36.47Qty in Cart: 0Quantity:Price:$36.47Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810587
MOOSE RACING
$43.80Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810587- SKU:
- M810587
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$43.80Qty in Cart: 0Quantity:Price:$43.80Subtotal: -
MOOSE RACING Motor Seals - Arctic Cat/Suzuki 822239
MOOSE RACING
$48.21Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09350822- SKU:
- 09350822
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- OIL
- APPLICATION:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- ATV
$48.21Qty in Cart: 0Quantity:Price:$48.21Subtotal: -
La Sleeve Sleeve and Piston Kit Honda TRX400FW Foreman 1995-2003 LAS-5286K
LA SLEEVE
$340.95Revitalize your Honda's performance with the LA SLEEVE Sleeve and Piston Kit. Designed for optimal efficiency, this all-in-one top-end rebuild kit enhances compression, torque, and horsepower, ensuring your 2-stroke engine operates at its peak...09310357- SKU:
- 09310357
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$340.95Qty in Cart: 0Quantity:Price:$340.95Subtotal:
