Question about Briggs & Stratton Briggs Stratton Vanguard V - Twin Vertical Ohv Engine with Electric Start 23 Hp, 1" X 3 5/32" Shaft, ModelNo. 386777 - 0036 - E1

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Vanguard twin 303447 drops a cylinder when hot under load have to have choke on to keep it going,have cleaned carby and tank plus checked compression and spark

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There is hose coming from your valve cover to pump. check it for cracks. one of your gaskets at the air filter housing to carb or carb to black block or block to intake maybe leaking. fuel shut off solenoid could be going bad. choke cable adjustment. there is crank case breather under air filter housing with a s shaped hose coming from it to air filter housing make sure it is not loose. i have an engine at work that did =the same thing. i work at a golf course. i am the mechanic. i changed the hose from valve cover to pump and it cured that problem

Posted on Jan 06, 2010

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Posted on Jan 02, 2017

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1 Answer

Runs good-but has no power under load


reset the valve clearance to .010 and .012 as they will holding open when hot and upsetting the carby flow

May 27, 2013 | Briggs & Stratton Briggs Stratton Vanguard...

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I have a 18 hp b&s vanguard engine and it will only run on half choke any ideas


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

Sep 22, 2012 | Briggs & Stratton Electrical Supplies

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I have a SRM2100 trimmer, it will not run unless the choke is full on and of course after it runs in this mode a little while, it fouls the plug and quits. I cleaned the carb, installed new kit, new...


hi there jaybolt

here is a website for parts

http://www.partstree.com/parts/?lc=echo&mn=SRM-2100+Type+1+S%2FN%3A+001001+-+159490

all being well and compression and spark and timming , muffler is clear , carby is clean , and diaphrams are all ok you mention carb rebuilt , fresh mix , and fuel filter and lines are good

does the unit run with 2 stroke mix in the plug hole - then stop ?
if yes assume compression and spark are ok,, if no check compression and spark and muffler

will the unit run with 2 stroke mix sprayed into the carby throat, then stop ?

if it does sounds like you have a air leak somewhere in the intake system

could be at barrel base gasket, c/case joint, manifold boot/ block gasket, carby gasket , impulse hose ,if this unit has one , c/case main seals leaking

2 strokes need air tight c/cases in order to pump fuel / air / oil mixture from c/case to cylinder
and to create a vacuum for entry of fuel/ air / oil mix from carb to c/case

symptoms of air leak are -: hard to start, wont idle, stalling, low power, inconsistant idle, over rev
overheat

pressure and vacuum testing can be done by blocking off intake and exhaust with rubber and metal plates , then fitting adapter to spark plug hole , and placing piston at bdc , pressureise cylinder to 7 to 8 psi of pressure and check areas , base gasket, manifold joint, main seals, , impulse hose ? for leaks with soapy water - if leaking bubbles will be evident

if no leaks and pressure is held at 7 psi for at least 2 minutes with dropping - presure test is good
next do the same test using vaccuum again go to 20 - 30 inch / vaccuum

if vaccuum held unit is ok

suggest take a good look at carby and recheck its rebuilt correctly and setup particularly if P and V test are good and spark coil tests good with a coil load test using a spark gap of 6.00 mm to stress the coil ( simulates spark under compression load)

have a look and let me know what you find

cheers pauly46

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It sounds like your valves are out of adjustment. Your starter will bog down if it is out of adjustment and stop at the compression release.
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Oct 04, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

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Aug 03, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

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Is the choke staying on perhaps? check spark and plug check airflow, get compression test maybe the oil/compression rings giving way... sounds like its getting hot and increasing fuel flow for some reason??? perhaps clean carb with some cleaner while running (remove air cleaner) spray directly into carby while running run at full throttle as you spray it will try and die ... relax on the spraying and see how it goes.. check air cleaner for blockages as the same time :) hope you get it working!

May 04, 2017 | Briggs & Stratton Briggs Stratton Vanguard...

2 Answers

Have 303447 briggs 16 hp only fires one cylinder


Have you also changed the spark plug too. The ignition circuit is pretty simple, from the battery, the Coil is energized, the "points" or equivalent, through the "Distributor" or equivalent, and onto the Spark Plug. So it is a simple matter to work along the path, proving the "Integrity" at each, point by testing. IF it still doesn't fire after ensuring all Leads are OK, the Spark Plugs are proven OK, the Cables, the Points, & Distributor, . IT is either that or the Ignition Timing is OFF. Please check all those points.

Apr 23, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

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