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 Exhaust Valve DWCRF450REV13ND
DEL WEST
$155.95Off-road racing demands an exhaust valve that won't compromise under extreme conditions. The DEL WEST Exhaust Valve delivers the thermal stability and durability required to maintain peak engine...09262261- SKU:
- 09262261
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
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...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...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...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...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...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...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...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...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...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...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...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
$10.95 -
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...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...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...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...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...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...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...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...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
