B&S Intek troubleshooting

Discussion in 'Mechanic and Repair' started by JHC, Aug 4, 2010.

  1. JHC

    JHC LawnSite Member
    Posts: 42

    Need a little help on my riding mower. Just rebuilt the carb. New gas. Engine starts up fine, runs for about a minute and then dies. It will start back up and then quickly dies again. I noticed the plug was an autolite. I will change it out to RC12YC tonight. Any ideas? Could it be the plug? The carb has an adjustment on it but not sure if this is the problem. I was thinking maybe the fuel solenoid may be not working but I checked and it appears to open and close.

    Any help would be appreciated.
     
  2. JHC

    JHC LawnSite Member
    Posts: 42

    The engine numbers are:
    31C707-0175-E1

    Thanks.
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Can you slowly apply the choke and keep it running ?

    If so you missed a port/jet or something in the carb, If it's a Walbro make sure the jet on the side of the boss where the float bowl nut screws in is fully open. If it's a Nikki make sure the jet in the bottom of the white plastic transfer tube is fully open.
     
  4. JHC

    JHC LawnSite Member
    Posts: 42

    Nope. The choke won't control the shutdown. I need to verify if the gas cap is still good. Maybe it's not venting. Maybe the coil? It purrs real nice for about a minute and then just dies. Will start back up an immediately dies.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Not likely gas cap, It takes a few minutes for the tank to pull a vacuum. What brand machine is this engine on ? Model and serial number ?
     
  6. JHC

    JHC LawnSite Member
    Posts: 42

    Murray, Model 425000X8A, Ser. 7477851631D070. Yr. 2003
     
  7. JHC

    JHC LawnSite Member
    Posts: 42

    Just had her running for about an minute or so. Then she died. Went to pull the plug and plug wire was too hot to touch. Maybe the ingnition coil?? I put a spark tester on her while hot and no spark and then a little. So I think I may have solved the problem. Maybe....
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    It may be the coil but I don't recall one dropping spark that quick after start-up ?

    Just for giggles disconnect the black kill wire between the engine and mower harness and give it a try, This will eliminate a possible safety switch issue and further point to a faulty coil.
     
  9. FIXDISS

    FIXDISS LawnSite Senior Member
    Posts: 445

    Does it have an oil pressure or low oil shutdown switch ? It could be low on oil and Some engines will override on start then shut down if low or the switch is bad.
     
  10. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    How about your fuel filter, also depending on the age of the fuel lines...
    What you might do is with a handy fuel-resistant container unhook the fuel hose at the carb's end
    and while catching the fuel with the container is see how it flows through.
     

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