Adjust mixture vanguard

Yes the cam is out of time. possible stripped cam drive.

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 .

stalling
yes oil pressure switch's /modules are wired in to the spark systems of small plant motors as motor protection

i cant see one listed as a part for sale for 23 hp vanguard briggs
or mentioned in the user manual
386447 3079

if oil level is ok and oil pressure switch isnt the problem

check the governor adjustment
or adjust the idle




very simplistic drawing



386447 3079

How about a leak down test?? sounds like blow bye. is it consuming large amounts of engine oil???

it,s not getting enough gas, your carburater needs cleaned and there's an mixture screw on most engine's hope this helps

This sounds like a mixture issue. At the time you pull the trigger, the machine is intended to speed up. I suggest that you get the carb jets adjusted.

There is no adjustment for a Pilot Flame's Length on a Vent-free Gas Appliance. However, if you're using Natural Gas and it's a Natural Gas Heater, the normal length of the pilot flame is 2 to 2 1/2".
If it's a Propane Gas Heater and the pilot flame is as long as previously stated, you probably have a pressure problem from your tank. Contact your Propane provider to have them check the pressure on their tank regulator.

Vanguard which is not made anymore is part of the Desa Tech family.. You will find all the manuals for the Deas Tech family at:
http://www.desatech.com/

and mom next time call and ask.
Little Arch

It appears that you have a slight mis-adjustment in the idle speed and idle mixture. To adjust setup, start with at least a half tank of fuel, and have engine at operating temperature (That is warm but not overly Hot). The Briggs & Stratton Website manuals section should show the locations of the adjusting screws if you are not sure of them.
To adjust idle speed set Throttle control to minimum and adjust screw on throttle butterfly to maintain a good idle speed. To adjust idle mixture, screw in idle mixture screw (Lean) until motor falters and then screw out (Rich) until it falters again. Correct setting is the halfway point of these two positions. You may have to re-adjust idle speed again and also the mixture to get best running.
If you are not comfortable doing this, take it to a B & S dealer.

adjust gov. tangs