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Kohler engine wont start

Discussion in 'Mechanic and Repair' started by TheGrum, Jun 13, 2005.

  1. TheGrum

    TheGrum LawnSite Member
    Messages: 2

    I have a Scotts tractor with a 17.5 HP (13 kw) Kohler Command engine in it (Model CV490S). It was running fine with no problem, then was shut down. Since then, I have tried over numerous days to restart it without success. It will not start, but simply cranks without sounding like it wants to start. The only time it does sound like it has fire is when the choke is engaged, at which point it loudly backfires!

    I have replaced the spark plug and the fuel filter. I have checked for fuel flow, removed and inspected the carburetor, and removed the valve cover. Everything appears to be OK, but the engine will not start/run even roughly. I have tried using engine starting fluid, which also results in a backfire.

    Any suggestions? So far, the only things I can think of involve the fuel solenoid, the ACR (auto compression release), ignition module, or valve problems. Any other ideas, or any suggestion on what to try first?
  2. freddyc

    freddyc LawnSite Senior Member
    Messages: 578

    Spark or timing????? Did you check the plug after cranking it?? Sounds like its gettting fuel if it backfires.
  3. TheGrum

    TheGrum LawnSite Member
    Messages: 2

    I checked for fuel flow by disconnecting the fuel line to the carburetor (OK). I pulled the spark plug after cranking and it smells of fuel/plug is wet. It seems like it probably is a timing problem, but I want to check all options on fuel first (i.e. clogged main jet, etc.)
  4. mini14

    mini14 LawnSite Member
    Messages: 236

    check for spark, no spark its new coil time, over 20 years ive had to replace around 15 coils in various engines.

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