Our "615" Box Stock class carb. Airflow has been significantly increased by opening and reshaping the Venturi using a CNC machine - the same technology we use to bore our connecting rods. The fuel circuit is set to where we run them ourselves so you can bolt this to your box stock engine and run it immediately knowing that you aren't getting beat with carburetor. Will pass box stock tech. Specs: .22 low speed jet, .037 main jet, stock emulsion tube. You will need to set your engine to idle at approximately 2000 RPM by adjusting the large phillips head plastic idle speed adjustment screw.
Please note that the BOX STOCK engines must use a header and open airfilter installed to work with the jetting in this carb. The carb will NOT work with a stock muffler and airbox