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  1. #1
    Silver Member Grand_Pooba's Avatar
    Join Date
    Apr 2007
    Posts
    166
    Location
    Wyoming County, NY
    Tractor
    Bobcat CT230 & John Deere X324

    Default L120 Engine problems

    Hi all.
    I have L120 with about 300 hrs on it and it's been running very poorly. The engine misses and pops constantly at full throdle. I saw that one of the plug wires was arching to the block so I relaced it with a new wire/coil which gave me alittle improvement. Since the grass is growing fast I decide to take it to the dealer. They've replaced the other coil, new plugs, intake seals, rebuilt the carb, checked the compression....and it still pops. There stumped..
    Anybody else had this problem. The engines a 23hp briggs.

    Thanks
    Steve

  2. #2
    Silver Member
    Join Date
    Jul 2000
    Posts
    224
    Location
    Western,MA
    Tractor
    JD 850, L130, 317

    Default Re: L120 Engine problems

    Does the engine do this all the time, or only after running for a while? I have fixed a few with a plugged up vented fuel cap. It will create a vacuum in the tank and run lousy. Easy fix remove fuel cap carefilly pull out inner rubber seal and plastic baffel. Clean all the parts well reassemble. It is such a problem with the L series the dealer was not even taking the mowers off the truck or trailer when I was there one day, he just cleaned the caps and sent them on there way.

  3. #3
    Silver Member Grand_Pooba's Avatar
    Join Date
    Apr 2007
    Posts
    166
    Location
    Wyoming County, NY
    Tractor
    Bobcat CT230 & John Deere X324

    Default Re: L120 Engine problems

    I've read about that problem before on this site so I did check that out first.
    It makes that popping noise right from the begining and only at full throdle.

    Thanks for the responce.
    Steve

  4. #4
    Bronze Member
    Join Date
    Oct 2010
    Posts
    62
    Location
    Farmington, KY
    Tractor
    2010 JD 3038E

    Default Re: L120 Engine problems

    Did you ever figure out what was causing the problem? My dad's L120 is doing the same thing. I've already replaced one ignition coil, it was bad. But almost immediately after that, I noticed it was leaking oil around the base gasket. Well, last night I got the motor back together with a new base gasket and oil seal around the shaft. When I tried it out tonight, it started running just like before after about 10 to 15 minutes. I checked the spark on each cylinder with an ignition tester and they are good. I'm going to look at the fuel cap tomorrow just in case, but it just doesn't run like it's running out of gas.
    John Deere 3038e w/FEL
    John Deere LA175
    Home built 48" offset mower

  5. #5
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: L120 Engine problems

    Steve, when the engine starts running rough and popping, have you tried various choke positions? I have a LA145 with a 22 hp B&S. It started popping a bit after I replaced the float chamber needle valve with a new brass one. I'm not sure that has anything to do with the popping, but moving the choke lever to make the mixture richer will cause the engine to smooth out. After it warms up, the problem is mostly gone and the engine runs pretty good. If you choke it a bit and the the problem goes away, you've pretty much narrowed it down to fuel starvation and/or you need to make the mixture a bit richer.
    Jim


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