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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!
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