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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DEL WEST Titanium Valve Locks DW-H-LX02
DEL WEST
$24.95Valve locks are a critical failure point in high-RPM engines—premature wear or collapse will destroy your valvetrain in seconds. DEL WEST titanium valve locks deliver the reliability demanded by NASCAR, Formula One, and professional motocross teams who...09261821- SKU:
- 09261821
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- VALVE
- PRODUCT NAME:
- LOCK
- UNITS:
- 4 PACK
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
DEL WEST Titanium Valve Locks DW-H-LX01
DEL WEST
$24.95DEL WEST titanium valve locks deliver the reliability and precision your high-rpm engine demands, whether you're running a naturally aspirated screamer or a forced-induction platform. Engineered by the same team trusted by NASCAR, Formula One, and...09261820- SKU:
- 09261820
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- PRODUCT NAME:
- LOCK
- UNITS:
- 4 PACK
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
DEL WEST Intake Valve DW-KX250FIV09ND
DEL WEST
$155.95Off-road competition demands valve components that can withstand extreme thermal cycles, aggressive RPM swings, and continuous high-stress operation. The DEL WEST Intake Valve DW-KX250FIV09ND is purpose-built for this punishment, delivering the...09261740- SKU:
- 09261740
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$155.95 -
DEL WEST Exhaust Valve DW-KX250FEV04ND
DEL WEST
$155.95If you're pushing your off-road machine to its limits, valve reliability becomes non-negotiable. The DEL WEST DW-KX250FEV04ND exhaust valve is engineered to handle the extreme thermal and mechanical stresses of competition riding, delivering the...09261739- SKU:
- 09261739
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
DEL WEST Exhaust Valve DWCRF250REV10ND
DEL WEST
$155.95Off-road racing demands exhaust valves that won't compromise under extreme conditions—DEL WEST delivers precisely that level of reliability. This valve is engineered to handle the punishment of competition, with a proven track record in the field where...09261738- SKU:
- 09261738
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
$155.95 -
DEL WEST Intake Valve DWCRF250RIV10ND
DEL WEST
$155.95Off-road racing demands intake valves that can withstand extreme conditions without compromising performance or reliability. DEL WEST has built their reputation by engineering valves that perform consistently in the most demanding competition...09261737- SKU:
- 09261737
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
$155.95 -
Hot Cams Valve Shim Kit 9.48mm x 3.00mm for Honda CRF450R 2002-2014 HCSHIM02
HOT CAMS
$10.95Valve clearance drift is inevitable on high-mileage or high-performance CRF450R engines—ignoring it costs you horsepower and risks catastrophic valve damage. The Hot Cams Valve Shim Kit gives you precision-engineered replacements to dial in exact...09261408- SKU:
- 09261408
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.00 MM
$10.95 -
Hot Cams Valve Shim Kit 9.48mm x 2.65mm Honda CRF450R 2002-2023 HCSHIM02
HOT CAMS
$10.95Valve shim clearance directly impacts engine efficiency, combustion timing, and longevity—especially critical for high-revving CRF450R builds. This 5-pack of precision-engineered shims lets you fine-tune valve clearances without sourcing individual...09261401- SKU:
- 09261401
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.65 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.45mm for Honda CRF450R 2002-2023 5PK948245
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, noise levels, and overall engine longevity—and worn or damaged shims compromise all three. The Hot Cams Valve Shim 5-pack provides precision-engineered replacements that restore...09261397- SKU:
- 09261397
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STEEL
$10.95 -
Hot Cams Valve Shim 9.48 x 2.40 for Honda CRF450R 2002-2023 5PK948240
HOT CAMS
$10.95Valve clearance directly impacts your CRF450R's performance, fuel efficiency, and engine longevity. Over time, thermal cycling causes valve shims to wear, requiring periodic replacement to maintain precise clearance specifications. This 5-pack of HOT...09261396- SKU:
- 09261396
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.35mm for Honda CRF 450R 2002-2014 5PK948235
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, ignition timing, and overall engine longevity on your CRF 450R. Over time, valve shims wear and compress, throwing off critical clearance tolerances and robbing you of power and responsiveness. This...09261395- SKU:
- 09261395
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.35 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Valve Shim Kit for Honda CRF450R 2002-2014 5PK948230
HOT CAMS
$10.95Valve clearance drift is inevitable wear on high-performance engines—when tolerances slip out of spec, you lose power, risk valve float, and accelerate wear on critical components. The HOT CAMS Valve Shim Pack gives you precision adjustments to restore...09261394- SKU:
- 09261394
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.30 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.25mm for Honda CRF450R 2002-2023 5PK948225
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—especially on high-revving four-strokes like the CRF450R. These Hot Cams shims deliver the precision adjustments needed to maintain optimal clearance as your...09261393- SKU:
- 09261393
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.25 MM
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.20mm for Honda CRF450R 2002-2018 5PK948220
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, engine longevity, and peak performance on the track or trail. Hot Cams valve shims are precision-engineered replacements that maintain exact clearance specifications, ensuring your CRF450R operates...09261392- SKU:
- 09261392
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.20 MM
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.15mm for Honda CRF450R 2002-2023 5PK948215
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, valve longevity, and overall engine responsiveness—and shim wear is inevitable with high-mileage and high-performance applications. This Hot Cams 5-pack gives you precision replacements to maintain...09261391- SKU:
- 09261391
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- VALVE SHIM THICKNESS METRIC:
- 2.15 MM
$10.95 -
Hot Cams Valve Shim Kit for Honda CRF450R 2002-2014 5PK948210
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency and engine longevity—improper shim sizing leads to burnt valves, lost power, and costly rebuilds. The Hot Cams Valve Shim Kit supplies precision-engineered replacements to maintain exact clearance...09261390- SKU:
- 09261390
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$10.95 -
Hot Cams Valve Shim Kit for Yamaha YZ 250F 2014-2016 5PK948205
HOT CAMS
$10.95Valve clearance drift is inevitable on high-revving four-strokes like the YZ 250F—and even small deviations compromise power delivery and risk catastrophic valve damage. The Hot Cams Valve Shim Kit gives you precision replacements to dial in exact...09261389- SKU:
- 09261389
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.05 MM
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.00mm for Honda CRF450R 2002-2014 HCSHIM02
HOT CAMS
$10.95Maintaining proper valve clearance is critical to CRF450R performance and engine longevity. Over time, valve shims wear or become damaged during routine adjustments, requiring reliable replacements. This five-pack from Hot Cams gives you the precision...09261388- SKU:
- 09261388
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 1.95mm for Honda CRF450R 2002-2023 5PK948195
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, valve longevity, and overall engine reliability—especially critical on high-performance builds where tolerance stack-up compounds over time. HOT CAMS valve shims provide precision-engineered...09261387- SKU:
- 09261387
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
$10.95 -
Hot Cams Valve Shim 8.90mm x 2.40mm for KTM 250 SX-F 2005-2011 5PK890240
HOT CAMS
$10.95Valve clearance drift is one of the most overlooked maintenance items in high-revving four-strokes—and it directly impacts power delivery, throttle response, and engine longevity. The Hot Cams Valve Shim 8.90mm x 2.40mm is a precision replacement shim...09261366- SKU:
- 09261366
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.40 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
$10.95
