yost power tube

Discussion in 'Engine, Fuel and Exhaust' started by steve saunders, Apr 20, 2011.

  1. steve saunders

    steve saunders Member

    I recently installed a yost power tube in a friends S&S shorty E. The kit he had didnt come with any jets. My question is do you generally have to go up or down in size? It has a 70 main in it now
  2. Jack Klarich

    Jack Klarich Guest

  3. Fossil

    Fossil Active Member

    I just bought a new E Shorty for my Evolution. The carb comes with a 295 jet for low RPM and a #72 main. I put a #70 in the new one as the old carb had that main jet for eleven years. All that time I never had a single problem with that S&S E.