Lawn Boy mower question!

Discussion in 'Mechanic and Repair' started by ozark, Apr 12, 2007.

  1. ozark

    ozark LawnSite Member
    Messages: 44

    I have a 2 stroke silver series lawn mower that is about 4 years old. I noticed last year and the start of this year that sometimes when you start it, it will shoot gas out the exhaust for ten seconds or so. It also leaks gas out the exhaust hours after im done using it. I dont know if this is a stuck float or what the deal is. ANy help on this problem would be appreciated.:usflag: :usflag:
  2. gobblet

    gobblet LawnSite Member
    Messages: 155

    No matter what fuel and oil will get into carb. and this will cause smoke to blow out of muffler. I have seen this year after year and all I run is Lawnboys, nothing to worry about yet.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Sounds like your float needle valve is not closing (trash/stuck) and filling the cylinder with fuel.

    Remove the carb. and take the float bowl off. Check the float valve for trash or wear, clean the whole carb. out with carb & choke spray cleaner then re-assemble. Also check the fuel tank for trash and clean if needed.

    Install a fresh plug and you should be off and running.
  4. Indy452

    Indy452 LawnSite Member
    Messages: 14

    Ozark, Thats a classic lawnboy problem. Do as restorob says then add an inline fuel shutoff. I assume you are working on the duraforce engine? There isn't alot of room but it should fit fine. When you are done mowing shut the fuel off.
    Other option is to rekit the carb.
  5. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Messages: 3,716

    you can get the fuel shut off at lowes. i did this to all my duraforce lawnboys
  6. ozark

    ozark LawnSite Member
    Messages: 44

    Thanks guys for all the advice. I will start working on the mower today and hopefully resolve this issue:drinkup:
  7. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Messages: 2,249

    Don't stop with a needle and seat repair. No LB carb(with the exception of the Walbro equipped models with plastic floats) rebuild is complete without a float replacement. After continual exposure to gasoline the cork will expand, thereby allowing the float to contact the carb body before the fuel is effectively shut off. If you compare a new float with the one removed you may find the old one to be nearly 1/8" taller.


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