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Hot!BRIGGS & Stratton 6.5hp model #121412

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Dinnie
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2017/03/23 12:37:05 (permalink)
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BRIGGS & Stratton 6.5hp model #121412

HI: everyone,anyone. I have an older Yazoo walk behind self propel 22" mower, it has a  VANGUARD--Briggs and Stratton 6.5hp engine. I have been having a hard time trying to get my mower to start, sometime it takes me half hour or longer to get it to start and keep running. One problem may be my start control(red handle plus the white handle not positioned in the correct position). Another issue I believe is this engine I read somewhere that it has a oil sensor, that will not let the engine start if it is low in oil. Can someone confirm this for me. I have also found that the Module oil sensor on the back of the engine, has two wires broke or disconnected. Could this be the reason my motor will not start and run. When it does start it runs good, but if I let it cut off or cut it off, than I will have a hard time getting it back started. Could someone tell me where I can find a diagram as to how and what the module oil sensor connect to. Do I need to take off the entire cover to see where this module oil senor attach to??? Also I have been trying to replace the self propel chain, that move the self propel mower, and I cannot find a replacement chain.            

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    Mikel1
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/23 13:20:22 (permalink)
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    Parts can be hard to come by on them.
    Any idea on model #'s of the Yazoo and the rest of the #'s for the briggs?
    When you're having problems starting is it after it is hot or when you first(cold) try starting it?
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/24 11:47:58 (permalink)
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    YES I have this problem when the engine is cold or hot.
     
    S/N>>>>  11 1022 88 65838
    Roy
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/24 18:40:18 (permalink)
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    It sounds like someone has disconnected the oil sensor so it will not be a cause of your problem. The switch grounds the ignition if the oil is low. I would shut the fuel off and drain the carb into a glass jar by removing the bowl. You may find dirt or water.
    Mikel1
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/25 00:05:39 (permalink)
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    Is choke plate closing all the way when trying to start?
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/27 12:53:35 (permalink)
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    I have removed the gas bowl, and drained some of the gas from the bowl by untighten the gas bowl nut under the bottom, did not help much with starting the mower and keep it running. One other thing I notice is the two handles that control starting and control gas flow(the red handle, and the white handle) MY setting marks or dials on this mower has rubbed off and knowing  where to set these two handle become hard to set right, until after several, several times trying to start it. Do anyone know what is the correct setting for starting. Do both red and white handle need to aligned together to start. This white handle appear to control the choke plate. It is very ,very loose ,easy to move back and forward. Is this normal??? At this time I have the Carb. off and I see the choke plate, a little flat silver plate inside. Again when I do get this mower started it run good, just hard to get it back started when I cut the engine off. Can some tell me where I can buy another ROLL Chain, for this mower, the chain that turn the self propel move....   
    Mikel1
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/28 21:09:52 (permalink)
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    Can you tell if the choke plate is fully closing? If you have some carb cleaner on hand, spray a shot into carb and see if helps when starting up, choke not on.
    kawimaniac2145
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/28 21:58:46 (permalink)
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    completely clean the carb.
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/30 13:28:36 (permalink)
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    Are there any instruction or photo on how to best clean a CARB. on this engine 6.5 HP 
    Roy
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/03/30 16:40:57 (permalink)
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    It is not hard, remove the float, inlet needle and jets and thoroughly clean, I spray carb and choke cleaner and rinse with water. Tag wire works to clean out the small passages if you can reach them. Alternatively you could soak the body in Gunk after removing any plastic parts but I don't like the stuff, it stinks and is hard on skin.
    wildgoose
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/04/20 15:36:22 (permalink)
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    Several basic things: Spark, Fuel, Compression.
    Sometimes an crack in the insulator will cause the plug to misfire or short when its hot.
    Dirt or water in carb stirred up after running, or vapor lock.
    Oil thins out when engine is hot, causing low compression.
    I've had some of the ignition kill mechanisms short intermittently, give you a fit!
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/05/30 18:14:25 (permalink)
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    Also, there could be a coil problem. Especially once an old engine gets hot, the engine may shutdown and take longer to restart. starter coil may be bad.
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/14 11:44:42 (permalink)
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    I do have a older Yazoo walk behind 21" mower with a Vanguard 6.5 engine. At this point a cannot get to start. I last cut with it several months back. Once I get cranked up running it cuts good and pull like a horse. It has always been hart to get it started and running, sometime it takes 30 minutes or a hour, after pulling the start string several times over that period. My engine has two knobs on the side panel for starting the engine one red, and the other white. The red lower knob has a more stiff in sliding from one setting to another. The top white knob has a very, very weak if none at all in sliding from one setting to another. Can anyone tell me what each knob is, and what and where should both setting be in order for the engine to startup. I have removed the carb. and cleaned it out, and replaced. Still engine will not fire up. There is no fuel pump on this engine, just a gas filter. How can I check that gas is getting to the carb. Gas is in the carb bottom bowl. The carb has a black piece on top of the carb, that connect to two engine wires, one white connector and the other red connector. Looking from the side of the engine the white connector is on the outside side and the red connector on the inside. It is getting fire, I think. What is this black piece? is that a starter switch??? If so how can I tell if is bad of good..   
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/19 18:48:47 (permalink)
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    Hmmm. I think the two knobs you're referring to are the throttle (sometimes the top knob) and choke(the bottom). The loose one is probably the choke..that's for cold starting (typically needed during your first start up of the day). The throttle has more tension, that's probably the red knob you're talking about.

    What I'd do...make sure the throttle is open all the way (this makes the engine run faster). Whichever direction (sometimes to the left) the tension increases is the opening of the throttle.

    Try both directions for the white knob. Attempt to start. If nothing check fuel tank with a flashlight making sure there's no gunk. Long time storage using ethanol gas can cause damage to the fuel system (the ethanol breaks down to sugar). Always use gas treatment and start once every 2weeks minimum.

    CHECKING IF FUEL IS GETTING TO CARB?.....

    Grab a pair of vice grips pliers or a clip to pinch the line.

    Pinch the gas line nearby the carb.

    Disconnect gas line from carb.

    Unclip the gas line, if fuel's in the tank and fuel comes out if the line you disconnected, then the lines clean. If not, then replace gas line.

    CHECK SPARK PLUG

    Disconnect plug from connector

    Before unscrewing plug, clean area well.
    with compressed air if available.

    Use proper fitting socket (you can buy a small engine socket set from Wal-Mart cheap).

    Fit socket on a turn counterclockwise, but not too hard! If several attempts and it doesn't budget, use a little penetrant lube (WD-40, PB Blaster, etc). Spray, tap on the plug, wait a few minutes and remove.

    Continue...
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/19 18:52:14 (permalink)
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    Check plug and if tip is really white or burntlooking, then it needs replacing (AutoZone, O'Reilly's, etc). Or clean with clean brush.

    Check oil too. Some engines have a "low oil shut-off." I hope this helps
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/21 11:26:32 (permalink)
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    Thanks for all the replies: I will put a clamp on the gas line host and  pull off the gas line hose, that connect to the Carb off. Do I need to pull the starter line to see if gas come out of the gas host??? and what about the gas filter on the gas host, it on the gas host between the gas tank and the carb????  What is this black flat piece above the carb. that has two wires attached to it, one white wire, and one red wire???? Is this a senonoid switch, and could this part be preventing my vanguard engine from starting?? How to test if this senonoid switch is bad?????????????? 
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/21 13:45:30 (permalink)
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    U shouldn't need to pull the starter cord. If the gas line isn't pinched or clogged, it should just flow out gas. Make sure your gas fuel is clean too. I'd need a pic of the carb you're talking about. I'm not sure about the solenoid, but a faulty or worn starter coil can cause starting problems.
    Dinnie
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/23 11:00:28 (permalink)
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    Thanks for the reply: Where do I locate the starter coil??? This is a 6.5 HP Vanguard motor, animal engines. Looked over the WEB, and all the Vanguard motors look the same> maybe=model=?????  Over the past years I have used this motor, if the choke/throttle are not in the correct position, it will not start no matter how many times you crank it. I do not have anything that inform me what is the direct position the choke/throttle should be in. I have in the past just keep position both and pulling the start string until I get the right position, and it start and keep running. When it cuts off, or I use it a later time, I got through the same thing again, finding the right choke/throttle position. I took the carb. off cleaned it replaced it, and now I CANNOT FIND THE RIGHT POSITION TO GET IT RUNNING.          
    post edited by Dinnie - 2017/06/23 11:06:50
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/23 19:38:58 (permalink)
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    Before doing any of these things, always disconnect plug FIRST.

    To reach the starter coil, typically you'll have to take off the pulling cord plate on the engine. It's connected with a few screws or bolts as you're facing the area where u pull the cord to start. Remove the screws and slightly move that plate only slightly to access the starter coil.

    If u follow the spark plug connection (where the wire connects to it, it'll lead straight to the coil). There are another lead of wires that connect to the on/off switch. The coil should come off by loosening a few nuts. You have to disconnect the on/off housing leads too.
    ker0412
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    Re: BRIGGS & Stratton 6.5hp model #121412 2017/06/23 19:52:45 (permalink)
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    Ok. The throttle when moved to the direction of THE MOST TENSION, it's at the highest setting and used to start engine. Try starting the engine with the CHOKE in both directions. Also, squeeze the gun trigger we while cranking. Never start without the water hose connected too. Hope this helps.
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