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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Hot Cams Stage 2 Intake Camshaft for Yamaha YZ250F 2001-2012 4054-2IN
HOT CAMS
$335.95Unlock the full potential of your engine with the HOT CAMS Camshaft 4054-2IN, designed for high-performance racing applications. Offering exceptional throttle response and power gains, these camshafts are ideal for enthusiasts looking to enhance their...09250088- SKU:
- 09250088
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- INTAKE DURATION IMPERIAL:
- 256°
- INTAKE LIFT METRIC:
- 8.50 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- APPLICATION:
- INTAKE
- UNITS:
- EACH
$335.95 -
Hot Cams Valve Shim Kit for Honda CRF250R 2004-2017 HCSHIM01
HOT CAMS
$127.95The HOT CAMS Cam Shim Kit HCSHIM01 is an essential component for precision engine tuning, designed to optimize valve clearance and enhance performance. Each kit includes high-quality shims that ensure a perfect fit and reliable operation, making it a...09250010- SKU:
- 09250010
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- TYPE:
- VALVE
- DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$127.95 -
Hot Cams Cam Shim Kit for Honda CRF450R 2002-2023 HCSHIM02
HOT CAMS
$127.95The HOT CAMS Cam Shim Kit HCSHIM02 is designed for precision and performance, ensuring your engine runs smoothly and efficiently. Ideal for both professional mechanics and DIY enthusiasts, this kit provides the necessary components to optimize valve...09250011- SKU:
- 09250011
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- OFF-ROAD
- DIAMETER METRIC:
- 9.48 MM
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$127.95 -
Hot Cams Stage 2 Camshaft for Honda CRF450R 2002-2006 TRX450R 2004-2009 1024-2
HOT CAMS
$400.95Elevate your racing performance with the HOT CAMS Camshaft 1024-2. Designed for enthusiasts seeking enhanced power and responsiveness, these camshafts are engineered to optimize your engine's performance without the need for upgraded valve springs...09250024- SKU:
- 09250024
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- INTAKE LIFT METRIC:
- 10.10 MM
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- EXHAUST DURATION IMPERIAL:
- 270°
- EXHAUST LIFT METRIC:
- 8.80 MM
- INTAKE DURATION IMPERIAL:
- 248°
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$400.95 -
Hot Cams Stage 1 Exhaust Camshaft for Yamaha YZ250F 2001-2013 4020-1E
HOT CAMS
$310.95Unlock the full potential of your engine with the HOT CAMS Exhaust Camshaft 4020-1E. Designed for high-performance racing applications, this camshaft enhances both torque and horsepower, ensuring optimal power delivery across the RPM spectrum. Experience...09250032- SKU:
- 09250032
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- RIDING STYLE:
- OFF-ROAD
- EXHAUST DURATION IMPERIAL:
- 252°
- EXHAUST LIFT METRIC:
- 8.10 MM
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
$310.95 -
Hot Cams Stage 1 Exhaust Camshaft for 1998-2002 Yamaha WR400F and YZ400F 4035-1E
HOT CAMS
$296.95Unlock the full potential of your engine with the HOT CAMS Exhaust Camshaft 4035-1E, designed for high-performance racing applications. This camshaft enhances throttle response and delivers impressive power gains across the entire RPM range, making it an...09250033- SKU:
- 09250033
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- EXHAUST LIFT METRIC:
- 8.76 MM
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 259°
- UNITS:
- EACH
$296.95 -
Hot Cams Stage 1 Intake Camshaft for Yamaha WR450F 2003-2015 4023-1IN
HOT CAMS
$297.95Elevate your racing performance with the HOT CAMS Camshaft 4023-1IN, engineered for enthusiasts seeking maximum power and responsiveness. This camshaft is designed for seamless integration with stock valve springs, delivering impressive torque and...09250034- SKU:
- 09250034
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- INTAKE DURATION IMPERIAL:
- 269°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STAGE 1
- APPLICATION:
- INTAKE
- INTAKE LIFT METRIC:
- 8.90 MM
- UNITS:
- EACH
$297.95 -
Hot Cams Valve Shim 10.0 x 2.40 for 2008-2010 KTM 530 EXC-R 5PK1000240
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.40 replacement pack. Designed to refill your Valve Shim Kits, these high-quality shims ensure optimal valve clearance and improved engine efficiency. Perfect for professional...09261285- SKU:
- 09261285
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- MATERIAL:
- STEEL
$11.95 -
Hot Cams Valve Shim 10.0 x 2.50 for KTM 530 EXC-R 2008-2010 5PK1000250
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.50 5 Pack. Designed for precision and durability, these replacement shims ensure optimal valve clearance and improved engine efficiency. Perfect for refilling Valve Shim Kits, they...09261287- SKU:
- 09261287
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.50 MM
- TYPE:
- VALVE
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.60 for 2008-2010 KTM 530 EXC-R 5PK1000260
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.60. This high-quality replacement pack is designed to refill your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. Perfect for both professional mechanics and...09261289- SKU:
- 09261289
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- OFF-ROAD
$11.95 -
Hot Cams Valve Shim 10.0 x 2.65 for 2008-2010 KTM 530 EXC-R 5PK1000265
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.65 pack. Designed for precision and durability, these shims are essential for maintaining optimal valve clearance in your motorcycle or ATV. Each pack includes five high-quality...09261290- SKU:
- 09261290
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.65 MM
$11.95 -
Hot Cams Valve Shim 10.0 x 2.70 for 2008 KTM 530 EXC-R 5PK1000270
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.70, designed for precision and durability. This 5-pack is perfect for refilling your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. Crafted for easy...09261291- SKU:
- 09261291
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.70 MM
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.75 KTM 530 EXC-R 2008-2010 5PK1000275
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.75. This 5-pack provides essential replacements for your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. Designed for durability and precision, these shims...09261292- SKU:
- 09261292
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.75 MM
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- UNITS:
- 5 PACK
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.90 for 2008-2010 KTM 530 EXC-R 5PK1000290
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.90. This 5-pack of high-quality shims is designed to provide precise adjustments for optimal valve clearance, ensuring your engine runs smoothly and efficiently. Perfect for those...09261295- SKU:
- 09261295
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.90 MM
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 10.0 x 3.05mm for KTM 690 Enduro R 2009-2010 5PK1000305
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed specifically for precision tuning and maintenance. Each pack contains five high-quality shims, ensuring you have the right tools to optimize your valve adjustments. Perfect for...09261298- SKU:
- 09261298
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 3.05 MM
- MATERIAL:
- STEEL
$11.95 -
Hinson Racing Oil Filler Cap KTM 250 SX-F 2007-2015 OC477
HINSON RACING
$19.99The stock plastic oil filler cap on your KTM 250 SX-F is a weak point—it can crack under vibration, leak under pressure, and detract from an otherwise dialed machine. The Hinson Racing Oil Filler Cap replaces that liability with a precision-machined T-6...09500619- SKU:
- 09500619
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- CAP
- TYPE:
- OIL FILLER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- POLISHED
$19.99 -
VERTEX Piston Ring 53010005800
VERTEX
$29.95Piston rings are critical wear items that directly impact compression, blow-by control, and oil consumption—neglecting them leads to power loss and engine damage. VERTEX Piston Ring 53010005800 delivers the durability and precision required for both...09120173- SKU:
- 09120173
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- PISTON DIAMETER METRIC:
- 57.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
VERTEX Piston Kit 23641A
VERTEX
$302.95Whether you're rebuilding after high-mileage wear or stepping up to forged internals for increased boost tolerance, the VERTEX Piston Kit 23641A delivers the strength and precision needed to support your engine's demands. VERTEX's combination of advanced...09102073- SKU:
- 09102073
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- DISPLACEMENT:
- 350 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- PISTON DIAMETER METRIC:
- 87.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$302.95 -
Wiseco Engine Rebuild Kit for Suzuki RM250 2003-2004 PWR165A-100
WISECO
$732.95A worn or damaged engine in your RM250 doesn't just compromise performance—it threatens reliability when you need it most. The Wiseco Engine Rebuild Kit PWR165A-100 supplies every critical component for a complete top and bottom-end rebuild, restoring...09031544- SKU:
- 09031544
- Availability:
- Ships Same Business Day
- Weight:
- 13.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
$732.95 -
Wiseco Piston Kit 96mm 11.5:1 Honda CRF450R 2002-2003 4753M09600
WISECO
$229.95When you're pushing your CRF450R to the limit on the track or trail, your piston is where power meets durability. The Wiseco 4753M09600 delivers the compression ratio and material science you need to extract maximum performance while maintaining the...4753M09600- SKU:
- 4753M09600
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- COMPRESSION RATIO IMPERIAL:
- 11.5:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.94 MM
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal:
