21 hp briggs vanguard question

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Thread: 21 hp briggs vanguard question

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  1. #1
    Join Date
    Feb 2013
    Location
    shenendoah valley,va.
    Posts
    2,627

    21 hp briggs vanguard question

    hey friends ...i had to pull my motor out a few days ago , the starter had died . replaced it with a new starter ( briggs ) new solenoid . i changed the oil and filter and new spark plugs . got it back in , hooked up the wiring , etc. hit the key and it fired right up . it purred like a kitten .drove it around , turned it off and on several times and it worked great . after sitting maybe 2 days , i went out this afternoon , hit the key . the starter engaged but could'nt make the engine turn over . i reached in and pulled on the rope starter and it was really hard to pull on . i pulled harder and the engine '' freed up '' . i hit the key and it fired right up . drove around , turned it off and on numerous times with no problems . it's almost like after the engine sits awhile , it gets tight . any ideas , sticky valves ? valve adjustment ? i did'nt check to see if maybe the drive clutch was still grabbing the belt . any idears ? thanks always , johnboy va.

  2. #2
    Join Date
    Nov 2020
    Location
    Southwestern Ont Can about 5 miles from Lake Huron just north of the town of Goderich.
    Posts
    201
    Check the oil for gas. Sounds like maybe the carb over flowed and hydrolocked a cylinder. Place to start anyway.

  3. #3
    Join Date
    Feb 2013
    Location
    shenendoah valley,va.
    Posts
    2,627
    thanks laird ... and if thats the case , whats the cause ? the engines not that old . that sure sounds like what happens . i went out 3 hrs. later and it fired right up / any adjustments i need to do ? it sure runs excellent and strong . i appreciate your help . maybe some linkage on the carb needs looking at unless it's a internal engine thing . i'll see it it fires up in the morning after sitting overnite . appreciate it , johnboy

  4. #4
    Join Date
    Feb 2013
    Location
    shenendoah valley,va.
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    2,627
    fired right up this morning ...if carb is overflowing , is that a float bowl issue or needle setting ? jb

  5. #5
    Join Date
    Nov 2021
    Location
    Western Ky
    Posts
    25
    Easy way to check is next time it does it remove the spark plugs and see if it blows out gas. If it does there's yer problem. Should it be hydro lock then the problem will be the needle valve in the carb leaking. If it is running good for you a simple fix would be to put a shutoff valve in the gas line to turn off when it is not being used.

    Of course if does not do it again it could be it just had a piece of trash in the line that it held the valve open and it cleared itself when you ran the engine the next time.

  6. #6
    Join Date
    Feb 2013
    Location
    shenendoah valley,va.
    Posts
    2,627
    jww .. i was looking at u tube videos about hydrolocking and it sounds like in most cases the carb needle and maybe the seat are worn , so gas leaks thru intake , etc to top of cylinders . i have a shutoff ..so i can turn that off at nite . does it hurt the motor to run it . ? maybe try replacing carb needle ? will it still leak gas even if motor is not running ? thanks , jboy

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