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  1. #1

    Join Date
    Jul 2010
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    3
    Location
    California
    Mower
    John Deere

    john deere LT 170 won't start

    I got gas to the carb and spark at the plugs will not even try to start even if i spray starting fluid in carb. spins over just fine. I am confused

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  3. #2

    Join Date
    May 2010
    Posts
    5,445
    Location
    Kansas, Butler county, Just east of DooDah
    Mower
    CTL

    Re: john deere LT 170 won't start

    Your last post had no fuel... I am going to figure something fixed that problem... ? you didn't post back .
    All you need is fuel spark and air... At the proper time and in the proper amount and you will have a running engine. So assuming the spark is adequate and the fuel is also, that only leaves proper air flow....
    What brought this problem on? Did it suddenly quit and not start again, or has it been progressively getting harder to start? KennyV

  4. #3

    Join Date
    Jul 2010
    Posts
    3
    Location
    California
    Mower
    John Deere

    Re: john deere LT 170 won't start

    Quote Originally Posted by KennyV View Post
    Your last post had no fuel... I am going to figure something fixed that problem... ? you didn't post back .
    All you need is fuel spark and air... At the proper time and in the proper amount and you will have a running engine. So assuming the spark is adequate and the fuel is also, that only leaves proper air flow....
    What brought this problem on? Did it suddenly quit and not start again, or has it been progressively getting harder to start? KennyV
    It was running just fine, turned it off to take a phone call it would not start again. it was getting fuel. my mistake. what controls the timing on these or how do i check? It seems to have plenty of spark. I am no small engine mechanic but am very mechanically inclined thanks again for any advice.

  5. #4

    Join Date
    May 2010
    Posts
    6
    Location
    Tennessee
    Mower
    woods, 50 inch zero-turn

    Re: john deere LT 170 won't start

    did u by chance hit anything with it. i would pull the flywheel off and see if u sheered the sheer key. sometimes it will run even though it is slightly out of time as it might run hotter. once u shut it off it is out of time just enough to not let it restart.

  6. #5

    Join Date
    May 2010
    Posts
    15
    Location
    Illinois
    Mower
    EZR1648

    Re: john deere LT 170 won't start

    Have you checked to be sure you have compression? It may have stuck a valve open if it was running hot.

    What engine is in this mower?

  7. #6

    Join Date
    May 2010
    Posts
    66
    Location
    New Hampshire
    Mower
    Cub Cadet 3204

    Re: john deere LT 170 won't start

    Quote Originally Posted by fasteddy View Post
    I got gas to the carb and spark at the plugs will not even try to start even if i spray starting fluid in carb. spins over just fine. I am confused
    Your LT170 should have a 16hp Vanguard V-Twin, right?
    If neither cylinder is firing I doubt you have compression or valve problems as it would be possible, but unusual for both cylinders to fail.

    I'll second what another poster suggested that you check the condition of the mag shear key. If the spark is advanced the engine will "bite" on the starter, and if retarded it will spin over fast but not start.

  8. #7

    1,000 Post Club
    RobertBrown's Avatar
    Join Date
    Aug 2010
    Posts
    1,256
    Location
    Florida
    Mower
    Ford

    Re: john deere LT 170 won't start

    fasteddy hasn't logged in since July. He may have figured it out.

  9. #8

    Join Date
    May 2010
    Posts
    66
    Location
    New Hampshire
    Mower
    Cub Cadet 3204

    Re: john deere LT 170 won't start

    Quote Originally Posted by RobertBrown View Post
    fasteddy hasn't logged in since July. He may have figured it out.
    fasteddy may be a little slow, like me.

  10. #9

    Join Date
    Nov 2010
    Posts
    2
    Location
    perth, ontario
    Mower
    Noma 18hp

    Re: john deere LT 170 won't start

    I was wondering if maybe something happened to one of the safety switches. My tractor has one under the seat and I believe linked to the clutch as well.......maybe a short in the wiring or faulty switch?

  11. #10

    Join Date
    May 2010
    Posts
    66
    Location
    New Hampshire
    Mower
    Cub Cadet 3204

    Re: john deere LT 170 won't start

    Quote Originally Posted by Dershell View Post
    I was wondering if maybe something happened to one of the safety switches. My tractor has one under the seat and I believe linked to the clutch as well.......maybe a short in the wiring or faulty switch?
    As was pointed out, the OP hasn't posted since July, so we'll probably never know what his problem was. Safety switches will cause either the starter not to engage, or will kill the ignition. The OPs starter was engaging and he had spark to the plug. Either low compression, or ignition out of time, would seem to be the problem.

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