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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ATHENA Race Gasket Kit - Yamaha R4856-199
ATHENA
$25.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to...09346370- SKU:
- 09346370
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
ATHENA Connecting Rod Kit P40321032
ATHENA
$103.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230478- SKU:
- 09230478
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- DISPLACEMENT:
- 85 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- DISPLACEMENT:
- 100 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 80 CC
$103.95 -
ATHENA Connecting Rod Kit P40321019
ATHENA
$121.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230503- SKU:
- 09230503
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 250 CC
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$121.95Qty in Cart: 0Quantity:Price:$121.95Subtotal: -
ATHENA Connecting Rod Kit P40321022
ATHENA
$160.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230506- SKU:
- 09230506
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$160.95Qty in Cart: 0Quantity:Price:$160.95Subtotal: -
ATHENA Connecting Rod Kit P40321023
ATHENA
$160.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230507- SKU:
- 09230507
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
$160.95Qty in Cart: 0Quantity:Price:$160.95Subtotal: -
ATHENA Piston Ring Set - Standard S41316004
ATHENA
$27.95Replacement rings for Athena Forged Pistons09120005- SKU:
- 09120005
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- BORE SIZE METRIC:
- 53.95 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
$27.95Qty in Cart: 0Quantity:Price:$27.95Subtotal: -
ATHENA Ring Set S41316181
ATHENA
$55.95Replacement rings for Athena Forged Pistons09120331- SKU:
- 09120331
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 68.96 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- ENGINE TYPE:
- 4-STROKE
$55.95Qty in Cart: 0Quantity:Price:$55.95Subtotal: -
ATHENA Crankshaft - Yamaha/Malaguti S410130320005
ATHENA
$221.95Made of special steel and manufactured with CNC high-precision machinery, Standard stroke09210020- SKU:
- 09210020
- Availability:
- Ships Same Business Day
- Weight:
- 2.84 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CRANKSHAFT
- UNITS:
- EACH
$221.95Qty in Cart: 0Quantity:Price:$221.95Subtotal: -
ATHENA Piston Kit S4F05400011A
ATHENA
$147.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100090- SKU:
- 09100090
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE SIZE METRIC:
- 53.94 MM
- DISPLACEMENT:
- 124 CC
- TYPE:
- A
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
$147.95Qty in Cart: 0Quantity:Price:$147.95Subtotal: -
ATHENA Piston Kit S4F06400001A
ATHENA
$1,140.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100103- SKU:
- 09100103
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 63.94 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
- DISPLACEMENT:
- 200 CC
$1,140.95Qty in Cart: 0Quantity:Price:$1,140.95Subtotal: -
ATHENA Complete Gasket Kit - Kawasaki P400250850028
ATHENA
$151.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09343039- SKU:
- 09343039
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- UNITS:
- KIT
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal: -
TMV Oil Plug - Blue - Suzuki 310OP401BU
TMV
$29.95Machined from 6061 T-6 aluminum, O-ring included09500296- SKU:
- 09500296
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- BLUE
- TYPE:
- OIL
- BASE COLOR:
- BLUE
- MATERIAL:
- 6061 ALUMINUM
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
WISECO Ring Set 2224CD
WISECO
$49.95Each ring set is for one piston2224CD- SKU:
- 2224CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- SET
- BORE SIZE METRIC:
- 56.50 MM
- DISPLACEMENT:
- 120 CC
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wossner Piston Kit 66.36mm Honda CR250R 2002-2004 8066DC
WOSSNER
$150.96Elevate your engine's performance with the WOSSNER Piston Kit 8066DC, designed for 2-stroke applications. This premium piston kit combines cutting-edge engineering with high-quality materials to ensure optimal performance and longevity, making it the...09105501- SKU:
- 09105501
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 66.42 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
Wossner Piston Kit 53.95mm Kawasaki KX125 2003 8073DA
WOSSNER
$122.00Elevate your engine's performance with the WOSSNER Piston Kit 8073DA, designed specifically for 2-stroke applications. Crafted from high-quality materials and engineered in Germany, this piston kit ensures durability and efficiency, providing a...09105503- SKU:
- 09105503
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
MOOSE RACING Ignition Cover Gasket 816618
MOOSE RACING
$5.74Made in the U.S.A.09346157- SKU:
- 09346157
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.74 -
LA Sleeve Cylinder Sleeve 54.25mm Bore 1999-2000 KTM 125 SX FL5404
LA SLEEVE
$137.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5404, designed specifically to restore performance and extend the life of worn cylinders. Crafted from high-quality materials, this replacement sleeve ensures optimal fit and durability, making...09310031- SKU:
- 09310031
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- BORE SIZE METRIC:
- 54.25 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$137.95Qty in Cart: 0Quantity:Price:$137.95Subtotal: -
LA Sleeve Cylinder Sleeve for Honda CRF450R 2004-2008 CRF450X 2005-2017 TRX450R 2006-2014 H5537
LA SLEEVE
$144.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve H5537, designed for optimal performance and durability. This high-quality replacement sleeve provides a perfect fit for worn-out cylinders, ensuring reliability and efficiency. Upgrade your...09310155- SKU:
- 09310155
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE SIZE METRIC:
- 96.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- RIDING STYLE:
- OFF-ROAD
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
LA Sleeve Cylinder Sleeve 2004-2006 KTM 125 SX FL5553
LA SLEEVE
$131.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5553, designed for optimal performance and durability. This high-quality replacement sleeve provides a reliable solution for restoring old cylinders, ensuring your engine runs smoothly and...09310261- SKU:
- 09310261
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- AC
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$131.95Qty in Cart: 0Quantity:Price:$131.95Subtotal: -
LA Sleeve Cylinder Sleeve 2008 Suzuki RM-Z450 FL5693
LA SLEEVE
$159.95Revitalize your engine with the LA SLEEVE Cylinder Sleeve FL5693, designed to restore the performance of worn-out cylinders. Crafted from high-quality materials, this replacement sleeve ensures durability and precision fit for optimal engine function...09310639- SKU:
- 09310639
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 66.40 MM
- COLOR/FINISH:
- CHROME
$159.95Qty in Cart: 0Quantity:Price:$159.95Subtotal:
