AirSpeed VW Community Forums

Technical => Engine Tech Forum => Topic started by: flat4 on August 03, 2010, 12:18:46 PM

Title: Tuning problem
Post by: flat4 on August 03, 2010, 12:18:46 PM

I've been working for a few hours trying to tune my friends 1904.  He's running dual 36 dellortos.  The issue I'm having is with the mixture screw on #4.  When adjusting all the way in/out, it doesn't change the idle speed of the engine in the slightest.  With 1-3, when the mixture screws are turned, idle either drops or increases (to a point).

We pulled the idle jets, cleaned them out, cleared the carb body (with air), cleaned the mains, replaced the rubber washers on the idle stacks, and still nothing.

I thought it might be a vacuum leak, but was unable to locate one.

Totally stumped, and looking for suggestions.

Thanks!

Fred.

Title: Re: Tuning problem
Post by: Chris on August 03, 2010, 01:55:44 PM

How are the shafts and bearings? Greased the gaskets? Did you compare the mixture screw to the others for wear?