WEBER TUNING MANUAL PDF

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EUROPEAN SPORT ENGINES FITTED WITH WEBER CARBURETORS. FERRARI GT. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page The Haynes. Weber. Carburetor. Manual by A K Legg LAE MIMI, Don Peers, . through theory, maintenance, overhaul and tuning, using only the nec-. Engine fuel and air feed systems. WEBER CARBURETOR ADJUSTMENT SETTINGS. 40 DCOE 2 carburetor – Adjustment setting example.


Weber Tuning Manual Pdf

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I discovered ramblipetasga.ml of the original Weber Tuning Manual from Bologna. Download here. Tuning of Weber carburetors. All Weber carburetors have four circuits. Idle. Cross -over. High Speed. Accelerator. Idle and Cross-over - These circuits are. Proper idle jets are very important to a Weber's performance (this assumes there is no vacuum leaks or other carb problems check here). Idle Speed Screw.

Less than 1 turns out Go down on the primary idle jet more than 2 turns out Go up on the primary idle jet between 1 and 2 turns out Primary jet is correct size It is important to follow all linkage and lever installation instructions.

Weber Carburetor Tuning Manual

The number one and two reasons for tuning errors are improper linkage installations and over tightened linkage nut, causing a binding in linkage assembly. Do not depend on the factory delivered settings. Check them before the carb is installed.

All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. 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.

You will hear a metallic click as the cam is released. 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.

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.

IMPORTANT TECHNICAL ARTICLE....Jetting and Tuning Weber Carbs.

Cycle the linkage again to be sure that the linkage comes to close without any assistance. Set the mixture screw see Fig 1 by first screwing in until the screw stops, bottoms out.

Back out the screw 2 full turns. Start the engine, the engine will run very slowly more like a tractor. As long as the engine stays running idle speed is not important at this point.

The first thing to do is not set up the idle speed, but to set the idle mixture screw to lean best idle setting. The engine should pick up speed and begin to smooth out. Adjust each mixture screw to the best, fastest and smoothest running point.

Do this procedure with each mixture screw. Now you may adjust the Idle Speed Screw. These carbs are commonly used in pairs, this makes the synchronization important, be sure to bring the high flowing carb down to the low flow carb. After synchronizing multiple carbs, reconfirm steps b.

You are cheating by opening the throttle plates and exposing additional progression holes in the transition. We have included the zero by-pass valve in our jet kit.

Weber S.P.A. Weber Carburatori. Tuning manual

This will deliver all of the available fuel to the engine and not by-pass fuel back to the fuel bowl. This will increase the duration and volume of the pump shot with the original pump jets.

This is for maximum fuel delivery from the accelerator pump circuit. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor.

Be sure for initial carburetor set up all air by-pass screws should be in closed position. These are not commonly used in standard carburetor adjustment. Check them before the carb is installed.

All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. 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.

Documents Similar To Weber Carburetor Tuning Manual

You will hear a metallic click as the cam is released. 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. 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. Cycle the linkage again to be sure that the linkage comes to close without any assistance. Set the mixture screw see Fig 1 by first screwing in until the screw stops, bottoms out.

Back out the screw 2 full turns.

Start the engine, the engine will run very slowly more like a tractor. As long as the engine stays running idle speed is not important at this point. The first thing to do is not set up the idle speed, but to set the idle mixture screw to lean best idle setting.

The engine should pick up speed and begin to smooth out.

Use your ear, not a scope or tuning instruments at this point. You want to tune the engine by sound.

Adjust to best, fastest and smoothest running point.Check rule of thumb for idle jet selection in Weber basic idle adjustment instruction. By 02G , January 15, We have included the zero by-pass valve in our jet kit.

The engine should pick up speed and begin to smooth out. Time taken in the setup will provide more fun later.

This is the number one and two reasons for tuning errors, improper linkage installations and over tightened linkage nut, causing binding in the linkage assembly.