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  1. #1

    Join Date
    Aug 2013
    Posts
    5
    Location
    Kentucky
    Mower
    John Deere

    John Deere JS46 Hard Starting Problem

    I have a three year old John Deere JS46 walk behind mower with a Briggs Engine. The mower has had very little use. Lately, it has gotten harder and harder to start. Fresh fuel, clean air filter, new spark plug... It takes several hard pulls on the cord, and it usually just makes a ffffft ffffft ffffft sound, and it sometimes backfires. After a few pulls, it'll hit a time or two, then finally catch, miss some, slowly build up to speed, and then finally start running fine. If I shut it off hot, it is just as hard to start as it was cold. I'm not sure if this is related, but when it is running, the engine will often surge and run fast briefly when under load.

    This engine seems to have an easy start feature that floats the valves to reduce compression when the cord is pulled??? If so, it almost seems as if the valve isn't closing so the engine can start. Sometimes, it acts as if it is flooded. I just can't any obvious problem.

    Does anyone have any ideas?

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  3. #2

    Join Date
    Aug 2013
    Posts
    5
    Location
    Kentucky
    Mower
    John Deere

    Re: John Deere JS46 Hard Starting Problem

    Quote Originally Posted by mgilbert View Post
    I have a three year old John Deere JS46 walk behind mower with a Briggs Engine. The mower has had very little use. Lately, it has gotten harder and harder to start. Fresh fuel, clean air filter, new spark plug... It takes several hard pulls on the cord, and it usually just makes a ffffft ffffft ffffft sound, and it sometimes backfires. After a few pulls, it'll hit a time or two, then finally catch, miss some, slowly build up to speed, and then finally start running fine. If I shut it off hot, it is just as hard to start as it was cold. I'm not sure if this is related, but when it is running, the engine will often surge and run fast briefly when under load.

    This engine seems to have an easy start feature that floats the valves to reduce compression when the cord is pulled??? If so, it almost seems as if the valve isn't closing so the engine can start. Sometimes, it acts as if it is flooded. I just can't any obvious problem.

    Does anyone have any ideas?
    Really disappointed that so many people looked at this and didn't offer any advice... After checking everything, I began to think that it sounded like a timing problem. Turned out to be that the flywheel was a few degrees out of position because the key was sheered - a simple problem to fix!!! Keep that in mind if you ever run into something similar...

  4. #3
    Carscw's Avatar
    Join Date
    Aug 2011
    Posts
    5,250
    Location
    Georgia
    Mower
    Toro

    Quote Originally Posted by mgilbert View Post

    Really disappointed that so many people looked at this and didn't offer any advice... After checking everything, I began to think that it sounded like a timing problem. Turned out to be that the flywheel was a few degrees out of position because the key was sheered - a simple problem to fix!!! Keep that in mind if you ever run into something similar...
    Sorry no one helped you. It has got to the point that people on here don't want to help for fear of getting insulted by the so called small engine master techs on here.

    (( cowboy up and get over it ))

  5. #4

    Join Date
    Aug 2013
    Posts
    5
    Location
    Kentucky
    Mower
    John Deere

    Re: John Deere JS46 Hard Starting Problem

    Quote Originally Posted by Carscw View Post
    Sorry no one helped you. It has got to the point that people on here don't want to help for fear of getting insulted by the so called small engine master techs on here.

    (( cowboy up and get over it ))
    I understand. Thanks... At least I was able to solve the problem.

  6. #5

    Join Date
    Oct 2013
    Posts
    1
    Location
    Texas
    Mower
    John Deere

    Re: John Deere JS46 Hard Starting Problem

    Quote Originally Posted by mgilbert View Post
    Really disappointed that so many people looked at this and didn't offer any advice... After checking everything, I began to think that it sounded like a timing problem. Turned out to be that the flywheel was a few degrees out of position because the key was sheered - a simple problem to fix!!! Keep that in mind if you ever run into something similar...
    Hi. I have the same problem with mine. Where is this flywheel located? My mower just went out of warranty. I have maybe used it 15x in 3 years.

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