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 Valve Shim 7.48mm 1.75mm Thickness 5-Pack 5PK748175
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity. Over time, valve shims wear and compress, causing improper clearance that leads to poor sealing, reduced power output, and potential valve damage. The HOT CAMS...09261313- SKU:
- 09261313
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.75 MM
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.70mm for Honda CRF 150R 2007-2018 5PK748170
HOT CAMS
$10.95Maintaining proper valve clearance is critical to your CRF 150R's engine longevity and performance—and worn or incorrect shims will cost you reliability. This 5-pack gives you the precision replacements needed to dial in exact clearances and keep your...09261312- SKU:
- 09261312
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.70 MM
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.65mm for Honda CRF 150R 2007-2018 5PK748165
HOT CAMS
$10.95Valve clearance directly impacts engine performance, compression, and longevity—and worn or incorrect shims compromise all three. These Hot Cams valve shims maintain precise clearance specifications to keep your CRF 150R running at peak efficiency and...09261311- SKU:
- 09261311
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.65 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.60mm for Honda CRF150R 2007-2018 5PK748160
HOT CAMS
$10.95Proper valve clearance is critical to engine longevity and performance—too tight and you risk valve float and bent pushrods; too loose and you'll have excessive valve train noise and lost compression. Hot Cams Valve Shims give you the precision...09261310- SKU:
- 09261310
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.60 MM
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.55mm for Honda CRF150R 2007-2022 5PK748155
HOT CAMS
$10.95Valve clearance drift is one of the easiest maintenance items to overlook—and one of the most costly when ignored. These Hot Cams valve shims maintain precise clearances between your rocker arms and valve stems, ensuring consistent combustion efficiency...09261309- SKU:
- 09261309
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- VALVE SHIM THICKNESS METRIC:
- 1.55 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.50mm for Honda CRF150R 2007-2022 5PK748150
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, engine longevity, and power output—and this Hot Cams shim pack gives you the precision tools to dial in your CRF150R's valve train exactly. Whether you're maintaining stock specs or chasing...09261308- SKU:
- 09261308
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.50 MM
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.45mm for Honda CRF150R 2007-2018 5PK748145
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—and shim wear is inevitable with high-performance riding. This Hot Cams 5-pack gives you precision replacements to maintain exact valve timing without guesswork or...09261307- SKU:
- 09261307
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- VALVE SHIM THICKNESS METRIC:
- 1.45 MM
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.40mm for Honda CRF150R 2007-2022 5PK748140
HOT CAMS
$10.95Valve clearance directly impacts your CRF150R's combustion efficiency, power delivery, and engine longevity. Over time, valve shims wear and compress, throwing off critical tolerances—this 5-pack from Hot Cams lets you maintain precise clearance...09261306- SKU:
- 09261306
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 5 PACK
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.40 MM
$10.95 -
Hot Cams Valve Shim 7.48mm x 1.35mm for Honda CRF150R 2007-2018 5PK748135
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, engine longevity, and overall performance—even slight deviations can cause loss of power or accelerated wear. The Hot Cams Valve Shim Pack provides precision-engineered replacements to maintain...09261305- SKU:
- 09261305
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.35 MM
- TYPE:
- VALVE
$10.95 -
DEL WEST Outer Intake Valve DW-YZ450F-2IV03
DEL WEST
$155.95If you're running a YZ450F at the edge of performance, your valve train is where reliability gets tested hardest. The DEL WEST Outer Intake Valve is engineered to handle the demands of high-RPM off-road competition without compromise. Choose a valve...09261075- SKU:
- 09261075
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$155.95 -
DEL WEST Intake Valve DW-YZ450F-1IV03
DEL WEST
$155.95Off-road competition demands intake valves that can handle extreme conditions without compromise. DEL WEST delivers precisely engineered components backed by a proven track record in the most demanding racing environments. When your engine's breathing...09261074- SKU:
- 09261074
- 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 DW-YZ450F-EV03
DEL WEST
$155.95Exhaust valve reliability is non-negotiable in off-road racing, where extreme temperatures and aggressive throttle cycles demand precision engineering. The DEL WEST DW-YZ450F-EV03 delivers the durability and performance repeatability that...09261072- SKU:
- 09261072
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$155.95Qty in Cart: 0Quantity:Price:$155.95Subtotal: -
DEL WEST Outer Intake Valve DW-YZ250F-2IV02
DEL WEST
$155.95If you're pushing your YZ250F to its limits in competition, valve reliability directly impacts your engine's durability and peak performance. DEL WEST's outer intake valve is engineered to withstand the extreme thermal and mechanical stresses of off-road...09261070- SKU:
- 09261070
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
$155.95 -
DEL WEST Intake Valve DW-YZ250F-1IV02
DEL WEST
$155.95If you're pushing your YZ250F to its limits in competition, valve integrity directly impacts your engine's reliability and peak performance under extreme conditions. DEL WEST intake valves are engineered for the demands of off-road racing, where factory...09261068- SKU:
- 09261068
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
$155.95 -
DEL WEST Exhaust Valve DW-YZ250F-EV02
DEL WEST
$155.95When you're pushing your YZ250F to the limit, valve reliability becomes non-negotiable. DEL West exhaust valves are engineered to withstand the extreme thermal and mechanical stress of high-RPM off-road competition, giving you the durability and...09261067- SKU:
- 09261067
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
$155.95 -
DEL WEST Intake Valve DW-RMZ450-IV08
DEL WEST
$155.95If you're pushing your RMZ450 to its limits in competition, valve reliability directly impacts your power delivery and engine longevity. DEL WEST's intake valves have earned their reputation through real-world off-road racing, where failure isn't an...09261066- SKU:
- 09261066
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
DEL WEST Intake Valve DW-KX250F-IV09
DEL WEST
$155.95If you're pushing your KX250F to its limits in competitive off-road conditions, valve reliability becomes non-negotiable. DEL WEST intake valves are engineered to withstand the extreme thermal and mechanical stresses of high-RPM racing, giving you the...09261053- SKU:
- 09261053
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
$155.95 -
DEL WEST Exhaust Valve DW-CRF250R-EV04
DEL WEST
$155.95If you're running a CRF250R in competition, valve reliability under sustained high RPM is non-negotiable. DEL WEST's track-proven exhaust valve delivers the durability and precision tolerances that separate consistent podium finishes from catastrophic...09261041- SKU:
- 09261041
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$155.95Qty in Cart: 0Quantity:Price:$155.95Subtotal: -
Wiseco Intake Valve Honda CRF150R 2007-2021 VIS016
WISECO
$28.95The stock intake valve on your CRF150R won't cut it if you're running harder and hotter than the factory intended. Wiseco's VIS016 intake valve uses advanced CVD/CNI surface treatments to drastically reduce wear and friction—meaning your engine breathes...09260694- SKU:
- 09260694
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$28.95 -
Wiseco Exhaust Valve Honda CRF150R 2007-2021 VES016
WISECO
$38.95Exhaust valves are among the most thermally stressed components in your engine, and factory units often struggle under sustained high RPM operation. The Wiseco VES016 is purpose-built to handle the extreme temperatures and repeated stress cycles that...09260692- SKU:
- 09260692
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
$38.95
