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
-
Hot Cams Stage 3 Camshaft for Honda CRF450R 2002-2006 1056-3
HOT CAMS
$454.60The Hot Cams Stage 3 Camshaft unlocks measurable gains in mid-range torque and top-end horsepower for your CRF450R, whether you're competing on the track or pushing your bike to its limits on the...09250084- SKU:
- 09250084
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- ATV
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 265°
- EXHAUST LIFT METRIC:
- 9.10 MM
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 254°
- INTAKE LIFT METRIC:
- 10.40 MM
- TYPE:
- STAGE 3
$454.60 -
Hot Cams Stage 1 Exhaust Camshaft Yamaha YZ450F 2003-2009 4022-1E
HOT CAMS
$352.75If you're serious about extracting every bit of performance from your YZ450F, a quality camshaft swap is one of the highest-ROI modifications you can make. The Hot Cams Stage 1 Exhaust Camshaft is...09250035- SKU:
- 09250035
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- UNITS:
- EACH
- EXHAUST DURATION IMPERIAL:
- 265°
- EXHAUST LIFT METRIC:
- 8.67 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
$352.75 -
Hot Cams Steel Exhaust Valve for Honda CRF450R 2002-2006 8400002-1
HOT CAMS
$51.95If you're running a CRF450R at the edge of its limits, your stock exhaust valve is costing you power and reliability. Hot Cams' one-piece forged construction delivers the durability and precision...09262904- SKU:
- 09262904
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 84 MM
- APPLICATION:
- EXHAUST
- STEM DIAMETER METRIC:
- 4.970 MM
- OUTSIDE DIAMETER METRIC:
- 31.00 MM
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$51.95 -
Hot Cams Exhaust Valve for 2007-2008 Honda CRF450R 8400002-5
HOT CAMS
$53.95The stock exhaust valve on your 2007-2008 Honda CRF450R is a wear item that directly impacts combustion efficiency, valve sealing, and engine longevity. A forged, precision-machined replacement like...09262905- SKU:
- 09262905
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- STEM DIAMETER METRIC:
- 4.970 MM
- BASE COLOR:
- BLACK
- LENGTH METRIC:
- 84 MM
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- COLOR/FINISH:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 30 MM
- UNITS:
- EACH
$53.95 -
Hot Cams Steel Exhaust Valve 1999-2008 Honda TRX400EX 8400003-1
HOT CAMS
$48.95Your TRX400EX's exhaust valve is subjected to extreme heat cycles and high RPM stress—factory valves wear quickly under aggressive use or tuning. The Hot Cams Steel Exhaust Valve restores precision...09262906- SKU:
- 09262906
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 29.00 MM
- STEM DIAMETER METRIC:
- 5.460 MM
- APPLICATION:
- EXHAUST
- LENGTH METRIC:
- 101 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$48.95 -
Hot Cams Steel Intake Valve for Honda TRX400EX 1999-2008 8400003-2
HOT CAMS
$31.95The factory intake valve on your TRX400EX will eventually wear, restricting airflow and compromising engine efficiency. This Hot Cams replacement restores optimal valve sealing while adding...09262907- SKU:
- 09262907
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- LENGTH METRIC:
- 103 MM
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 33.00 MM
- RIDING STYLE:
- ATV
- STEM DIAMETER METRIC:
- 5.480 MM
- UNITS:
- EACH
$31.95 -
Hot Cams Steel Exhaust Valve for Suzuki DR-Z400S 2000-2009 2011-2017 8400009-1
HOT CAMS
$69.95The OEM exhaust valve is one of the most critical wear items in your DR-Z400S engine. Over time, carbon buildup, heat cycling, and seat erosion degrade sealing integrity, causing compression loss,...09262908- SKU:
- 09262908
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 81.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 29.00 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 4.960 MM
$69.95 -
Hot Cams Steel Intake Valve for Suzuki DR-Z400S 2000-2009 8400009-2
HOT CAMS
$53.95The intake valve is critical to your DR-Z400S's breathing efficiency—a worn or stock valve restricts airflow and limits power potential. HOT CAMS' forged steel construction and precision engineering...09262909- SKU:
- 09262909
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- LENGTH METRIC:
- 82.00 MM
- BASE COLOR:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 36.00 MM
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 4.980 MM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$53.95 -
Hot Cams Exhaust Valve for Honda CRF150R 2007-2023 8400020-1
HOT CAMS
$40.95The exhaust valve is critical to your CRF150R's combustion cycle—when it wears, you lose power, efficiency, and reliability. HOT CAMS' forged construction and precision engineering deliver the...09262910- SKU:
- 09262910
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- VALVE
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 80 MM
- OUTSIDE DIAMETER METRIC:
- 22.50 MM
- STEM DIAMETER METRIC:
- 4.470 MM
- UNITS:
- EACH
$40.95 -
Hot Cams Steel Intake Valve for Honda CRF150R 2007-2021 8400020-2
HOT CAMS
$29.95The intake valve is critical to your CRF150R's breathing efficiency—a worn or stock valve directly limits combustion chamber sealing and power delivery. Hot Cams' forged, nitride-coated design...09262911- SKU:
- 09262911
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STEM DIAMETER METRIC:
- 4.48 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
$29.95 -
Hot Cams Exhaust Valve Steel for Honda CRF450R 2009-2012 8400027-1
HOT CAMS
$50.95Your CRF450R's exhaust valve is critical to cylinder sealing and engine efficiency—a worn or damaged valve directly compromises power output and reliability. Hot Cams' forged exhaust valve delivers...09262912- SKU:
- 09262912
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- STEM DIAMETER METRIC:
- 4.970 MM
- COLOR/FINISH:
- BLACK
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$50.95 -
Hot Cams Steel Exhaust Valve Honda CRF250R 2010-2015 8400032-1
HOT CAMS
$51.95Factory exhaust valves wear under high RPM loads, causing compression loss and erratic idle quality. The HOT CAMS forged exhaust valve restores precise sealing and valve timing stability, directly...09262914- SKU:
- 09262914
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- BLACK
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 4.470 MM
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$51.95 -
Hot Cams Steel Exhaust Valve for 2000-2006 KTM 400 EXC 8400038-1
HOT CAMS
$64.95If you're running a 2000-2006 KTM 400 EXC, valve wear directly impacts combustion efficiency and engine longevity. The HOT CAMS Steel Exhaust Valve (8400038-1) is engineered as a direct OEM...09262915- SKU:
- 09262915
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER METRIC:
- 5.96 MM
$64.95 -
Hot Cams Steel Intake Valve for 2008-2009 KTM 450 XC 8400038-2
HOT CAMS
$40.95The intake valve is critical to your 450 XC's combustion efficiency and overall engine reliability. Factory valves wear under aggressive racing conditions, compromising sealing and airflow—exactly...09262916- SKU:
- 09262916
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- APPLICATION:
- INTAKE
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- STEM DIAMETER METRIC:
- 5.97 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$40.95 -
Hot Cams Stage 2 Intake Camshaft for 2017-2018 Kawasaki KX250F 2313-2IN
HOT CAMS
$264.95If you're serious about maximizing your KX250F's engine output, a high-quality aftermarket camshaft is one of the most direct paths to measurable performance gains. The Hot Cams Stage 2 drops in...09251244- SKU:
- 09251244
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- INTAKE DURATION IMPERIAL:
- 254°
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- INTAKE LIFT METRIC:
- 10.41 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STAGE 2
- UNITS:
- EACH
$264.95 -
Hot Cams Valve Shim 10.0mm x 1.85mm for KTM 530 EXC-R 2008-2010 5PK1000185
HOT CAMS
$11.95Proper valve clearance is critical to engine performance, efficiency, and longevity—and valve shims are the only way to achieve it precisely. The HOT CAMS 10.0 x 1.85mm Valve Shim is engineered to...09261274- SKU:
- 09261274
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.85 MM
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.00 for KTM 530 EXC-R 2008-2010 5PK1000200
HOT CAMS
$11.95Valve shim wear is one of the most overlooked causes of performance loss and engine noise in high-revving applications. The HOT CAMS 10.0 x 2.00 Valve Shim 5-pack maintains precise valve clearance...09261277- SKU:
- 09261277
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.05 for KTM 530 EXC-R 2008-2010 5PK1000205
HOT CAMS
$11.95Valve clearance drift is inevitable on high-mileage KTM 530 EXC-R engines, leading to reduced performance and increased wear on valve train components. These precision-engineered HOT CAMS shims...09261278- SKU:
- 09261278
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.05 MM
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.10 for KTM 690 Enduro R 2009-2010 5PK1000210
HOT CAMS
$11.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—spec it wrong and you'll face performance loss or catastrophic valve damage. The Hot Cams Valve Shim 10.0 x...09261279- SKU:
- 09261279
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.15 KTM 530 EXC-R 2008-2010 5PK1000215
HOT CAMS
$10.95Valve shim selection directly impacts your KTM 530 EXC-R's engine timing precision and overall performance consistency. Running the correct shim thickness maintains proper valve clearance, preventing...09261280- SKU:
- 09261280
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- VALVE SHIM THICKNESS METRIC:
- 2.15 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal:
