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I have a 6hp briggs and stratton that i just rebuilt the carburetor on. I can get it to start but it just chugs along at low idle. what adjustment am i missing.

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Check to see if the governor is hooked up correctly. Once it is idleing pull on the governor and see if it will speed up. If that's not the problem, your idle and air mixture may need adjusted. Turn the needle valves all the way in then back them out one turn. Then turn the air mixture clockwise until the engine just about dies. Then turn it counter-clockwise until it just about dies. Then set it somewhere in between. Do the same with the idle valve.

Posted on Apr 28, 2010

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There are two adjustments. 1) Idle speed ( the screw that contacts the throttle plate. 2) The high speed. Location depends on carb, if it's a venturi-jet (not attached to tank, it's on the bottom, start at 3/4 turn out from seat, adjust in or out until motor goes from idle to full throttle without stumble. There are only two screws so they shouldn't be hard to find, idle is where your throttle cable hooks.

Posted on Apr 28, 2010

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1 Answer

I have a Briggs & Stratton Vanguard 16 HP motor. It idles fine and it runs OK at high RPMS. But it backfires thru the carburetor during accelerating. Any suggestions?


On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
  1. With the engine off, remove the air filter and air cartridge.
  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow . Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed , set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
  6. With the engine running at idle , hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture .

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Joe,I found a parts schematic that shows the carburetor that includes an idle adjustment screw (part 95A). I know it'[s not the same a the two air/fuel mixture adjustment screws but this may be all you need to fix your problem. Start the engine, turn the screw clockwise until the engine begins to stall then give the screw a 1/2 counterclockwise turn or until the engine settles into a smooth idle. http://bsintek.basco.com/BriggsDocumentDisplay/29jnuDU.VFzXFix2.pdf

Hope this helps, Danno

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