40 IDF's are ideall for a daily driven vehicle due to giving better mpg than the bigger models. 40 IDF carburetors are factory equipped with 28mm venturis that help provide a terrific combination of fuel economy and performance. The Weber IDF series will fit comfortably under the engine deck lid of VW bugs, vans, and square backs. Smaller 1600cc and 1776cc engines will benefit from the increased port velocity and enhanced engine torque produced by Weber 40 IDF carburetors. The included CB Performance top quality 356 aluminum alloy manifolds, air filter hardware and Cross Bar Linkage provide exact throttle control and maintain adjustments between service points. Complete kits are available to fit most Dual Port VW and Porsche applications.

(Velocity Stacks are not included in 40 IDF Kits)


  • Air Correction Jet: 2.00
  • Emulsion Tube: F-11
  • Main Jet: 1.15
  • Pump Jet: .50
  • Idle Jet: .55 (drilled)
  • Venturi: 28mm

Dual Weber 40 IDF Kit - Type-3

SKU: 6446

    Opening Hours

    Mon - Fri: 9am - 5pm
    ​​Saturday: Closed
    ​Sunday: Closed

    By appointment only

    Mansfield, Nottinghamshire, United Kingdom

    Contact Us

    Aircooled Hut UK Ltd Company Number 11579950


    Mobile: 07477 050582      Aircooled Hut UK Limited