As long as the engine stays running idleĤb. Start the engine, the engine will run very slowly more like a tractor. PROVIDE THE PERFORMANCE AND FUEL ECONOMY AS DESIGNED.Ĥa. Back out the screw 2 full turns.īE SURE TO FOLLOW THE NEXT INSTRUCTIONS IN THE PROPER SEQUENCE, DEVIATION WILLĬAUSE THE CARBURETOR TO NOT FUNCTION TO ITS IDEAL SPECIFICATIONS AND MAY NOT OR BIND AS THIS WILL CAUSE DAMAGE TO THE SCREW AND IT’S SEAT IN THE BODY OFĬARBURETOR.
Set the mixture screw (see Fig 1) by first screwing in until the screw stops, bottoms out. (Checking for linkage bind) Now bring screw back into contact with the lever and continue to open or screwing in 1 turn no more than 11/2 turns.ģ. Cycle the linkage again to be sure that the linkage comes to close without any assistance. Set the Idle stop screw (speed screw see fig 1) by backing out the Idle speed screw until it is not in contact with the throttle stop lever. You can check the fast Idle screw under the choke assembly to confirm that it is not in contact with the choke fast idle cam.)Ģ. (You will hear a metallic click as the cam is released. This is done on automatic choke carburetors by first opening the choke butterfly by hand and inserting a wood block or wedge of some kind to hold open while the linkage is cycled (linkage operated through its full movement) to clear the choke cam. All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. Check them before the carb is installed.ġ. Do not depend on the factory delivered settings. Start set up by confirming carb base line settings. ANĪDVANTAGE OF THE WEBER CARBURETOR IS ITS EASE OF ADJUSTMENT AND TUNING. POOR RUNNING QUALITY DOES NOT MEAN A DEFECT IN THE CARBURETOR. The number one and two reasons for tuning errors are improper linkage installations and over tightened linkage nut, causing a binding in linkage assembly.ĬALIBRATIONS MAY VARY DUE TO REGIONAL FUELS AND STATE OF ENGINE TUNE AND It is important to follow all linkage and lever installation instructions. Idle Speed Screw should be no more than 1 1/2 ( this assumes there is no vacuum leaks or other carb problems check Proper idle jets are very important to a Weber's CARBURETOR SET UP AND LEAN BEST IDLE ADJUSTMENT
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