The Oil Analysis Company | Weber Jet Suggestions | Home Page | Oil Sample Kits | Weber Carb Parts | Porsche Posters | Contact Us | Shopping Cart | FAQs | Links Page | Links Page 1 | Security & Company Info | Carb Tuning | PMO Overview | Articles | A Oil Comparison | Linkage Adjusting O-Ring This O Ring should be placed on the Idle Mixture Adjusting Screw with a Special Cup Washer (also available here) used to keep the O-Ring in place against the Side of the Carbs.  These O-Rings and the special washers can make a huge difference in the way your Porsche runs!  Without the washers and o-rings the engine will have a vacuum leak and it will back-fire, spit and sputter except when accelerating (which is usually very smooth).  The O-Rings are Item # 43 on most Weber 40-IDA parts diagrams. $0.25 Related Items Here are some products that may also be of interest to you: • Accelerator Linkage Kits • Intake Manifolds for 3.6L • Intake Manifolds (New) • Accelerator Pump Cover • Accel. Pump Spring - Large • Accelerator Pump Diaphram • Air Adjusting Screw • Banjo Bolts • Banjo Bolt Washer • Banjo Bolt Gasket • Carburetor Base Gaskets (6) • Cup Washers • Emulsion Tubes • Fuel Inlet Discharge Valve • Float Level Gauge Kit • Floats - Hard Foam or Metal (We suggest the Foam) • Fuel Bars • In Line Fuel Filters w/ Barb Fittings • Fuel Pump • Idle Adjusting Screw • Idle Jet Holder • Idle Mixture Adjusting Screw • Jets (Main, Idle, Air Correction) • K&N Vapor Kit • Watershield Air Cleaners • Main Jet Carriers • Manifold Gaskets - 12 pack • Needle Valve • O-Ring • Needle Valve Plug • Fuel Pressure Control Kits • Accelerator Pump, Body • Pump Studs • Rebuild Kits - 2 barrel • Rebuild Kits - 3 Barrel • Secondary Venturi's • Shaft Bushing • Heat Insulator Kit • Synchrometer • Air Horns (Velocity Stacks) • Venturi Set • Top Cover Gasket