Harley Davidson HSR42-18 Mikuni Carburetor Kit | Twin Cam (99 to present ) Big Twin (90-99) | CV Replacement Kit

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  • HSR42 Mikuni Harley Davidson Big twin performance kit
  • HSR42 Mikuni Harley Davidson Big twin performance kit
  • HSR42 Dyno Graph


  SpeedMotoCo HSR42 Mikuni Big twin carburetor kit. This kits adds roughy 25% more power to your bike combined with an exhaust and free flowing air filter. 

Stock Horsepower is around 57 and this kit will increase to around 72 with a pipe and filter.... Huge gains.  Torque also increased from 70 to over 80 FT pounds.

  This is the best way to make that  Big Twin get up and go! Specially designed to work with your original Harley  Davidson Intake Manifold, choke cable, air cleaner and throttle cables.

We made it easy!

 Can also be used with aftermarket filters designed for the stock CV carb by using our simple adaptor.     

This simple carb swap is the easiest and best way to improve performance on your Big twin. Dramatic increase in throttle response and acceleration. 

     Kit includes the Original Mikuni HSR42 Carburetor,  airbox adapter.

Specification Details
Choke Type Cable
Country Of Origin Japan
Engine Type Evolution Big Twin
Height 176mm
Intake Bell O.D. 65mm
Main Jet 160 (N100.604)
Manifold Type Spigot
Manifold to Manifold 90mm
Needle 8DDY1-97
Needle Jet Y-6 (723)
Pilot Jet 25 (VM28/486)
Size 42mm
Spigot Mounting O.D. 46.5
Throttle Valve 3.0 (TM42/08)
Width 100mm


 Fits the following bikes and more!  Dont see you bike listed? Contact us for fitment or the kit you need


Twin Cam Bikes from 1999 To present 

Big Twin Bikes 1990-1999

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