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Tune IDF
Weber
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Jetting the Weber IDF carb.IDF Weber Tune-UP Tips We recommend using a Fuel regulator with all Webers set at approximately 2# to 3.5#. Also at least one good fuel filter between Fuel pump & Carburetor. Pay Special attention when sealing top and bottom of air filter. Some filter base plates will warp if over tightened, leaving gaps for dirt to enter. Also Oil filter element. ck Use CLEAN GAS CONTAINER, any rust or grit entering with fuel will cause major problems. CARBURETOR SYNCHRONIZATION: First close the throttle plates (Idle speed screw on linkage) until the tip of the screw is flush with the casting's. Check for binding or sticking of the throttle plates. With the idle speed screws in this position, the throttle plates should be completely closed in the bores. Correct any misalignment or binding BEFORE proceeding. Turn "in" (Clockwise) the idle speed screws on each carburetor until the tip of the screw just touches the carburetor lever. From this "contact" position turn each idle speed screw exactly one full turn. This is your preliminary starting position. Then loosen the jam nuts and close the air bypass screws on each Carburetor. Each Carburetor must be adjusted separately. Using the Synchrometer or Uni-syn to determine which carburetor barrel produces the lowest reading. Next adjust the air bypass screws corresponding with the low reading barrel until your Synchrometer reading matches the higher barrel. Once both barrels of the carburetor show the same reading, lock down the jam nuts. Repeat the above for each carburetor. LOW SPEED TUNING: First set idle screws on linkage so engine is running at approximately 500 rpm. Then adjust the idle mixture screw out for the fastest and smoothest running idle. Try to obtain the leanest setting without affecting the idle speed. Each Carburetor idle mixture screw should be within 1/4 turn of each other. FLAT SPOTS when accelerating off idle can be caused by several things. (1) Too Large a Carburetor for the engine. (2) Exhaust Valves to large. (3) Wrong Cam. (4) Air Leaks. (5) Bad Distributor. (6) Bad Acc. Pump. If this problem still exists after proper tuning Try increasing the IDLE JET size and closing off the exhaust pump jet. When a Carb is too Lean, it will hunt and appear to surge very gently. When too Rich it will feel rough and lumpy. After setting the idle speed. The idle mixture screw setting is correct when turning the screw either way slows the engine speed. Plug Readings will be needed to tune carburetors at higher RPMs . Large carburetors will amplify any other engine problems. 2 & 2 do not = 4 when dealing with dual carbs. A single 48 on an 1835cc motor will be more over carbureted then dual 44's When running Dual Carbs the engine can handle a cam with more duration then if it were running a single carb. No amount of tuning will compensate for a worn out engine. We find that 8 out of 10 Carburetor problems are caused by Dirty Gas and Air Leaks, If they had been properly tuned when originally installed. We have Jet Reamers and Jet Gauges available if Major Turning is Required. You might also pick up the DELLORTO Tech Book which has a lot of good information even if your running WEBERS. Synchrometer for setting Dual Carbs ->*ck -- Jet Reamers->*ck -- Jet Gages->*ck *Special Price*--*ck We have several of these Fuel-Air Monitor Kits with the all white lettering (no Red K&N Decal) at a 1st come price of $149.95 order ( Reg. Priced $235.95 ) For more information->*Click The Air/Fuel Monitor can tell the tuner at a glance what the approximate air/fuel ratio of the engine is, at any given moment under any load or throttle setting. Go Back Victor Comp. Products Inc. **--Vic's--** Phone 816-650-3535 • 230 S Hudson St., Buckner, Missouri, 64016, US |