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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XCELDYNE Intake Valve Springs PSIMX2104
XCELDYNE
$75.57Single spring, low drag design increases horsepower, Springs can only be used on titanium valves, Designed for use with most cam grinds, Purpose built racing valve spring made from the highest quality Kobe spring wire09260643- SKU:
- 09260643
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- PRODUCT NAME:
- SPRING
- UNITS:
- PAIR
$75.57 -
XCELDYNE Exhaust Valve Springs PSIMX2401
XCELDYNE
$75.57Single spring, low drag design increases horsepower, Springs can only be used on titanium valves, Designed for use with most cam grinds, Purpose built racing valve spring made from the highest quality Kobe spring wire09260647- SKU:
- 09260647
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- UNITS:
- PAIR
$75.57 -
XCELDYNE Valve Seal Kit CVMSEA12001
XCELDYNE
$15.53Made from premium Viton material and offers superior oil control, Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power, Fit OE valve and valve guide dimensions for many applications09260653- SKU:
- 09260653
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- MATERIAL:
- VITON
- TYPE:
- VALVE
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.53 -
On Sale
XCELDYNE Valve Seal Kit CVMSEA13001
XCELDYNE
MSRP: $15.53Now: $10.00Was: $15.53Made from premium Viton material and offers superior oil control, Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power, Fit OE valve and valve guide dimensions for many applications09260655- SKU:
- 09260655
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- UNITS:
- KIT
MSRP: $15.53Now: $10.00Was: $15.53 -
KIBBLEWHITE Valve Seal - 4.5mm - Viton 80-80710
KIBBLEWHITE
$17.45All valve seals are made of 100% solid Viton® for long life, Meet or exceed OEM specifications, When using Kibblewhite spring kits, Kibblewhite valve seals must be used because of spring clearances, Made in the U.S.A.09263369- SKU:
- 09263369
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SEAL
- STEM DIAMETER METRIC:
- 4.50 MM
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.370'
- MATERIAL:
- VITON
- UNITS:
- SET OF 8
$17.45 -
Twin Air Oil Filter for Honda TRX700XX 2008-2009 XL250R 1984-1987 140001
TWIN AIR
$11.95Twin Air Oil Filter 140001 Enhance your motorcycle's performance with the Twin Air Oil Filter 140001, expertly crafted to deliver exceptional engine protection for a variety of Honda and Kawasaki models. Built with premium materials, this filter ensures...140001- SKU:
- 140001
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- STYLE:
- STANDARD
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
$11.95 -
Twin Air Oil Filter for Honda CRF150R 2007-2024 CRF250R 2004-2024 CRF450R 2002-2024 140003
TWIN AIR
$11.95Twin Air Oil Filter 140003 Experience unmatched engine protection with the Twin Air Oil Filter 140003, meticulously engineered for a variety of Honda and Husqvarna models. Crafted from high-quality materials, this filter ensures peak performance and...140003- SKU:
- 140003
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
$11.95 -
Twin Air Oil Filter for Kawasaki KL600 1984-1986 KLX250R 1994-1996 KL250 1982-1984 KL650B Tengai 1990-1991 KLF300 Bayou 2x4 1989-2003 140004
TWIN AIR
$11.95Twin Air Oil Filter 140004 Experience unparalleled engine protection with the Twin Air Oil Filter 140004, specifically designed for a variety of Kawasaki motorcycles and ATVs. Utilizing premium paper filtration materials and cutting-edge manufacturing...140004- SKU:
- 140004
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$11.95 -
Twin Air Oil Filter for Suzuki LT-F160 1991-2004 LT-F250 1988-2001 DR200SE 1996-2009 DR-Z125 2003-2014 140005
TWIN AIR
$11.95Twin Air Oil Filter 140005 Experience unparalleled engine protection with the Twin Air Oil Filter 140005, meticulously designed for Suzuki and Kawasaki motorcycles. Utilizing premium filtering materials and innovative production techniques, this oil...140005- SKU:
- 140005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
$11.95 -
Twin Air Oil Filter for KTM 250 350 450 500 525 530 2007-2024 140019
TWIN AIR
$11.95Twin Air Oil Filter 140019 The Twin Air Oil Filter 140019 is meticulously crafted to deliver exceptional engine protection for a variety of KTM, Husqvarna, and GasGas models from 2007 to 2024. Utilizing state-of-the-art materials and innovative...7120133- SKU:
- 7120133
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
$11.95 -
Twin Air Oil Filter for KTM 250 450 500 525 530 2006-2016 140020
TWIN AIR
$11.95Twin Air Oil Filter 140020 Experience superior engine protection with the Twin Air Oil Filter 140020, specifically designed for KTM and Husqvarna models from 2006 to 2016. Engineered with high-quality filtering materials and cutting-edge technology, this...7120134- SKU:
- 7120134
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
$11.95 -
Twin Air Oil Filter Kawasaki KX250 KX450 2004-2024 140018
TWIN AIR
$11.95Twin Air Oil Filter 140018 for Kawasaki KX250 & KX450 Experience unparalleled engine protection with the Twin Air Oil Filter 140018, specifically designed for Kawasaki KX250 and KX450 models spanning from 2004 to 2024. Crafted with precision and using...7120031- SKU:
- 7120031
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
$11.95 -
VERTEX Piston Kit VTK22813CD
VERTEX
$116.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103115- SKU:
- 09103115
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$116.95 -
VERTEX Piston Kit VTK23429CD
VERTEX
$127.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103116- SKU:
- 09103116
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 39.47 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 50 CC
- PRODUCT NAME:
- TOP END PISTON KIT
$127.95 -
VERTEX Piston Kit VTK22481CD
VERTEX
$139.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103117- SKU:
- 09103117
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
$139.95 -
VERTEX Piston Kit VTK23430CD
VERTEX
$127.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103118- SKU:
- 09103118
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- TOP END PISTON KIT
$127.95 -
VERTEX Piston Kit VTK22998B
VERTEX
$206.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103120- SKU:
- 09103120
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$206.95 -
VERTEX Piston Kit VTK22854B-1
VERTEX
$243.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103121- SKU:
- 09103121
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$243.95 -
VERTEX Piston Kit VTK22854B
VERTEX
$243.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103122- SKU:
- 09103122
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
$243.95Qty in Cart: 0Quantity:Price:$243.95Subtotal: -
VERTEX Piston Kit 23614050
VERTEX
$170.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102050- SKU:
- 09102050
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 100 CC
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 52.95 MM
$170.95
