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
-
On Sale
XCELDYNE Exhaust Valve XEVM12001
XCELDYNE
MSRP: $160.58Now: $103.00Was: $160.58If you're chasing measurable gains in flow efficiency and engine responsiveness, the XCELDYNE Exhaust Valve XEVM12001 delivers the precision engineering that separates competitive builds from stock...09260490- SKU:
- 09260490
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
MSRP: $160.58Now: $103.00Was: $160.58 -
XCELDYNE Exhaust Valve XEVM13000
XCELDYNE
$202.40If you're serious about extracting maximum flow and power from your engine, stock exhaust valves are leaving performance on the table. The XCELDYNE XEVM13000 delivers a measurable 15% flow increase...09260491- SKU:
- 09260491
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
$202.40 -
On Sale
XCELDYNE Exhaust Valve XEVM33006
XCELDYNE
MSRP: $152.93Now: $98.00Was: $152.93The XCELDYNE XEVM33006 exhaust valve delivers measurable flow improvements where it matters most—at the seat, tip, and guide—allowing your engine to expel combustion gases more efficiently and unlock...09260505- SKU:
- 09260505
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
MSRP: $152.93Now: $98.00Was: $152.93Qty in Cart: 0Quantity:Price:MSRP: $152.93Now: $98.00Was: $152.93Subtotal: -
XCELDYNE Valve Locks - Exhaust XLOM45801
XCELDYNE
$38.18Valve lock failure at high RPM is a catastrophic risk that can destroy your engine in seconds. XCELDYNE Valve Locks eliminate this danger with precision engineering that keeps your keepers locked...09260520- SKU:
- 09260520
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- LOCK
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET OF 4
$38.18Qty in Cart: 0Quantity:Price:$38.18Subtotal: -
XCELDYNE Intake Valve Springs PSIMX1905
XCELDYNE
$75.57If you're serious about extracting maximum horsepower from your engine, valve spring selection directly impacts your cam's ability to perform. The XCELDYNE Intake Valve Springs PSIMX1905 deliver the...09260637- SKU:
- 09260637
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
$75.57Qty in Cart: 0Quantity:Price:$75.57Subtotal: -
XCELDYNE Intake Valve Springs PSIMX2104
XCELDYNE
$75.57If you're running a high-revving engine with titanium valves, valve spring performance directly impacts your peak horsepower and reliability under sustained boost or cam aggression. The XCELDYNE...09260643- 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
$75.57If you're serious about extracting maximum horsepower from your engine, valve spring selection directly impacts your cam's ability to perform. The XCELDYNE Exhaust Valve Springs PSIMX2401 deliver the...09260647- 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
$15.53Valve seal degradation is one of the most common sources of oil consumption and compression loss in high-mileage engines. The XCELDYNE Valve Seal Kit CVMSEA12001 replaces worn seals with premium...09260653- 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
$15.53Qty in Cart: 0Quantity:Price:$15.53Subtotal: -
On Sale
XCELDYNE Valve Seal Kit CVMSEA13001
XCELDYNE
MSRP: $15.53Now: $10.00Was: $15.53Valve seal degradation is one of the most insidious sources of oil consumption and power loss in high-mileage engines. The XCELDYNE Valve Seal Kit CVMSEA13001 replaces worn seals with premium Viton...09260655- 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: $15.53Qty in Cart: 0Quantity:Price:MSRP: $15.53Now: $10.00Was: $15.53Subtotal: -
On Sale
KIBBLEWHITE Valve Seal - 4.5mm - Viton 80-80710
KIBBLEWHITE
MSRP: $17.45Now: $15.71Was: $17.45Valve seals are critical to controlling oil consumption and maintaining combustion chamber integrity—a worn or inadequate seal can lead to oil burning, carbon buildup, and lost power. The Kibblewhite...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
MSRP: $17.45Now: $15.71Was: $17.45 -
Twin Air Oil Filter for Honda TRX700XX 2008-2009 XL250R 1984-1987 140001
TWIN AIR
$11.95A quality oil filter is non-negotiable for engine longevity—it directly impacts how well contaminants are removed from your oil and how effectively your engine stays protected under load. The Twin...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
$11.95Engine protection starts with filtration, and the Twin Air Oil Filter 140003 delivers the particle separation your Honda CRF needs to run clean and reliable through thousands of miles of demanding...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
$11.95Clean oil is the lifeblood of engine longevity, and the Twin Air Oil Filter 140004 ensures your Kawasaki stays protected with efficient particle removal and consistent flow rates. This OEM-equivalent...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
$11.95Clean oil is non-negotiable for engine longevity, and a quality oil filter is your first line of defense against particulate damage. The Twin Air 140005 delivers OEM-equivalent filtration performance...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
$11.95Proper oil filtration is non-negotiable for maintaining peak engine performance and extending the service life of your KTM dirt bike. The Twin Air 140019 delivers reliable particle removal and...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
$11.95Engine protection under extreme off-road conditions demands a filter engineered for reliability, not just flow. The Twin Air 140020 delivers high-efficiency filtration through premium paper media,...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
$11.95Contaminated oil degrades engine performance and shortens component lifespan—especially critical in high-stress motocross applications where engine temperatures and RPMs push limits. The Twin Air...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
$125.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit VTK22813CD delivers the durability and consistency your engine demands. Built with...09103115- 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
$125.95 -
VERTEX Piston Kit VTK23429CD
VERTEX
$137.95If you're building an engine that needs to survive sustained RPMs and aggressive combustion pressures, piston quality directly impacts reliability and longevity. The VERTEX Piston Kit VTK23429CD...09103116- 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
$137.95 -
VERTEX Piston Kit VTK22481CD
VERTEX
$150.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit VTK22481CD delivers the durability and longevity your engine demands. Built with advanced...09103117- 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
$150.95
