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  1. #1
    Gold Member
    Join Date
    Sep 2008
    Posts
    432

    Default small engine help

    i told someoone i would look at their john deere la115 lawn tractor. it is a home depot/lowes JD, not a "real" one. it was submerged in the hurricane irene floods, and was under 7 ft of water. it has a 17.5hp briggs and stratton engine, and is about 2 yeaars old.

    anyways, i have it running. changed the oil 3 times, cleaned the flywheel, new coil, cleaned/rebuilt carb w/B&S parts, cleaned fuel tank, new hoses, new air filter, etc. it runs well-kind of.

    if i move the throttle slowly from lowest speed to highest speed, it will rev up fine. if i move it quickly, it will chugg for a few seconds and die; and then will not restart on any throttle setting except the lowest speed position--and even that takes excessive cranking. the same will heppen if i try to engage the mower deck too fast. if i engage the mower nice and slow, it will take it, keep running, and the proceed to mow pretty well. it will usually only start with the throttle in its lowest speed setting, not on choke.

    given the parts i have replaced/rebuilt carb, i am at a loss. i dont have a manual/can't find one. the carb is non-adjustable, and is super clean inside and out.

    any ideas?? new carb??
    heavy equipment/heavy truck mechanic/heavy haul trucker
    2007 Kubota L4400
    1997 Ford F-Super Duty Service truck
    2009 Quality 12k trailer, 18'+2'
    2-71 Detroit Diesel powered generator
    '52 farmall super m
    Massey Ferguson 50a backhoe
    an odd collection of wheel horses
    Nothing runs like a yanmar, right?

  2. #2
    Platinum Member
    Join Date
    Mar 2006
    Posts
    665
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: small engine help

    I would take an educated guess and say that there is a jet in the carb that is partially plugged. May be corrosion related from the salt water from the hurricane.
    ILLINOIS ENGINE, Beecher City, IL
    Briggs and Stratton MST (Master Service Technician)
    ILENGINE over at Lawnmowerforum

  3. #3
    Veteran Member
    Join Date
    Sep 2002
    Posts
    2,357
    Location
    Michigan

    Default Re: small engine help

    Quote Originally Posted by RANDYT View Post
    I would take an educated guess and say that there is a jet in the carb that is partially plugged. May be corrosion related from the salt water from the hurricane.
    +1 - I'd take the carb back apart and blow out all the passages and look for dirt or water in the tank or fuel filter..

  4. #4
    Gold Member
    Join Date
    Sep 2008
    Posts
    432

    Default Re: small engine help

    carb has been apart twice, and is spotless. it was not saltwater, but "fresh" water.

    i am leaning towards a carb issue, but just want to rule out electrical issues. it does seem to be carb related
    heavy equipment/heavy truck mechanic/heavy haul trucker
    2007 Kubota L4400
    1997 Ford F-Super Duty Service truck
    2009 Quality 12k trailer, 18'+2'
    2-71 Detroit Diesel powered generator
    '52 farmall super m
    Massey Ferguson 50a backhoe
    an odd collection of wheel horses
    Nothing runs like a yanmar, right?

  5. #5
    Platinum Member
    Join Date
    Jul 2011
    Posts
    594
    Tractor
    Mahindra 4510

    Default Re: small engine help

    Before you go tearing things apart, make sure the governor springs are right...could also be a bad seat in the main jet, did your kit include new seats?

  6. #6
    New Member PappaWheeliee's Avatar
    Join Date
    Oct 2011
    Posts
    14
    Location
    NY
    Tractor
    Kubota B1750

    Default Re: small engine help

    Not sure what that carb looks like but Is it running rich? Could be the float level. When you put the coil on did you gap it? It should be 20 thousandths. You can use a match book cover or a post card to gap it. Most likely it's the carb. The ethanol they put in the gas bonds better with water than it does gas. So when you get water in the gas it gels up and could be hard to see. its like a clear yellow. I had a chainsaw carb I had to clean about 3 times. Also if there are any of those black clear or blue diaphragms with the gasket in the carb and you have them reversed that would make it not run right.
    good luck

    Chris

  7. #7
    Silver Member
    Join Date
    Dec 2010
    Posts
    114
    Location
    Tehachapi CA
    Tractor
    kubota L245DT Craftsman YS4500

    Default Re: small engine help

    I also vote for the carb. when you took it part did you remove anything that looked like a small freeze plug. If anything got in their it will have to be removed to clean it. Also, did you put the carb in parts dip?I have found that to be important. Good Luck

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