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Vanguard 20hp backfires through the carb when trying to start

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Sounds like carbon build up... spray some carbon cleaner or gas treatment to remove the carbon

Posted on May 08, 2014

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My briggs and stratton 18 hp vanguard model 356447 will not start just back fires through the carb. I have good comprssion and spark at both plugs. I replaced the flywheel key as thought the backfireing...


check intake valves for proper seating. If the valves do not close completely it will allow the engine to backfire thru the carb. Another possibility is internal timing caused by the misalignment of the timing gears between the crankshaft and cam gears.

Oct 29, 2013 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Vanguard backfires through carb


If you say the valve stems were bent..first did you find out what bent them they just bend...and is the valve face seat damaged..if they were not...your engine is out of time or you did not set the valve stem lash when replacing them this allows the intake valves to be open slightly under the firing stroke firing back through the carb and intake...you should have around four thousands of an inch clearance when the springs are completely relaxed and and you should be able to wiggle the valve rocker tappits ...check that if they are correct your engine is out of time..good luck

Oct 10, 2012 | Briggs & Stratton Briggs Stratton Vanguard...

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Kohler Courage 20hp backfires 10 seconds after shutdown


the solenoid on the bottom of the carb may not be working or not sealing and gas drips passed the valve

Aug 06, 2012 | Garden

1 Answer

Vanguard V Twin 18 hp. monted in Cushman Motor scooter, runs great at W.O.T and at on quarter throttle, misses at range inbetween


Sounds like your carb needs the fuel/air mix adjusted..uses all the gas at high speed but has excess at low speeds...find your adjusting screw and at med throttle slowly screw it clockwise until the engine starts to sputter then back it out until it starts to sputter again then continue to do this until you reach ideal mix where it runs the best it can..then go slowly through the throttle up and down..when set..unjust your idle speed screw to your ideal idle speed..if this dies not fix ..carb will bed cleaned or rebuilt. Good luck.. Note always push or pull your throttle handle slowly to position avoids gas load up causing sputter and backfire.

Mar 15, 2012 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

My briggs vanguard v-twin 16hp after initial start up this fall started leaking fuel from the carb into the cyl. and into muffler. The jet is seated and not dirty. It leaks somewhere else in the bowl. ...


The solenoid on the bottom is a fuel shut off solenoid to prevent backfiring if shutting down engine with the throttle still open. If you're leaking fuel into the engine, the float is not closing the needle valve in the carb. remove fuel bowl and replace float, and needle valve with seat.Be sure to blow out all fuel passages

Oct 15, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

I am considering purchasing a used Exmark with a 23 HP Vanguard engine (~70 hours on the engine). I've not been too pleased with Briggs (have one on my John Deere garden tractor - hot natured and...


yep its a briggs and normaly there very good ploders
if your john deere spluters and back fires it needs a good looking at check the valves first,,,a hand full of bolts and the heads off and if your carfull you can still use the same head gasket again,,,also check the carb there very finiky and need to be kept clean the air filter is a joke,,,but clean it anyhow and they like new plugs,,,every ten years or so? iv worked on 100s of brigss and stratons/vanguard. there good engines but there ploders not sprinters there ok in a tractor but no good in a tank there to darn slow

Mar 27, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

Have a 20hp vanguard on a go-devil long tail motor. engin runs at idle speed then when i put the propeller into the water it stalls. if i pull the choke and give full throttle it will run some and backfire


These engines seem to have problems maintaining the correct valve lash settings. try taking the valve covers off and checking the valve/pushrod clearance.on tdc compression stroke it should be .001-.003 clearance. then check exhaust stroke tdc on exhaust stroke. clearance should be same on the other valve then. hope this cures your problem.

Dec 22, 2009 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Engine appears to run normaly until PTO is egaged,then it backfires and quits. Engine is an 18 HP Vanguard twin, model 350777.


Check you float in the carb I had one a few years back and it was partualy plugged cleaned it out and everthing worked fine. Also is the PTO binding up or bearings going bad putting an excessive load on the motor.

Jul 04, 2009 | Briggs & Stratton Briggs Stratton Vanguard...

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