![]() The number one and two reasons for tuning errors are improper linkage installations and over tightened linkage nut, causing a … ALWAYS: Use new hose clamps on fuel hoses. This week I finished the WEBER 40 IDF tune up on my Porsche 912 engine. *fuel pump pressure - while at it check, replace or bypass for test the fuel filter. Engineered to fit - Designed to perform: Setup Adjustments: Start setup by confirming carb base line settings. The outer diameter should be enough to take up the slack in the mechanism, while still leaving some clearance to allow for expansion - I used a diameter of 7. ![]() Before the linkage between the carbs was reconnected, the idle stop screws on each carb were set to just barely touch when the throttle plate was fully closed. No more … Jeep Cj-7's and early wrangler YJ's with 4. (Maserati) Weber Carburetor adjustments 42 DCNF. Fully warm engine and ensure choke is fully open. The Weber DCOE - Quite an intimidating setup if you're new to carburetors. ![]() A couple of things you may want to do before bolting the carburetor on are: Set the idle adjusting screw, #56, by turning it in until it seats and backing it out 1 1/2 turns. 5 turns from bottom and 20* of timing just to idle smoothly. You screw this in to open the throttles more (more air, usually faster idle). Based on my practical experience herewith a check list, point 1 to 10 must be OK before fiddling with the carb adjustment: 1. I've rebuilt the carb on my 500L, after only a minor problem with the throttle linkage (I put it on the wrong way round meaning it revved like mad) it all seems to be just about working. In part 2 we will address the acceleration and main venturi. 70mph The following is my general understanding of Weber downdraft carbs. Always hold on the same end of the shaft you are tightening or loosening the nut! Steps to Rebuild your 48 IDA Carbs. Brand new weber 32/36 (from Weber carbs direct) put on a freshly rebuilt L18 seems to be running rich at idle, lean just off idle, evens out until the secondary opens and then runs lean again all this checked with a ColorTune. I had to fabricate the angle bracket to tilt it up towards the throttle linkage.
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