1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Petrol Lawnmower issue

Discussion in 'Home and Garden' started by Nevakonaza, Apr 30, 2019.

  1. Nevakonaza

    Mobster

    Joined: Jan 7, 2009

    Posts: 4,442

    Location: Stourbridge,West Mids.

    Hey guys,
    Anyone know anything about petrol lawnmowers?

    Our petrol lawnmower wont stay running,it chuggs chugs chugs wobbles about then dies lol.

    Any idea on what could be causing it not to stay running? it was fine last time we used it,has oil,put fresh petrol in it,appreciate any help.

    cheers!
     
  2. NoobCannon

    Mobster

    Joined: Jun 13, 2011

    Posts: 4,576

    Spark plug or fuel filter or air filtrr
     
  3. Nevakonaza

    Mobster

    Joined: Jan 7, 2009

    Posts: 4,442

    Location: Stourbridge,West Mids.

    hi,well i taken out spark plug cleaned it with some electrical contact cleaner same with the port,checked air filter its as clean as anything because i remember cleaning it last time i used it,not sure about fuel filter.
     
  4. area51

    Gangster

    Joined: Mar 22, 2009

    Posts: 468

    Location: Down town gaza/Lah'darn


    Hi what did the plug look like? ie clean or sooty? If been sitting could be float etc in carb not working right so not fueling if sooty will be fouling so over fueling/not firing properly sparking issues. Check flaps are working as sometimes choke gets stuck
     
  5. Kermit

    Wise Guy

    Joined: Oct 27, 2002

    Posts: 2,214

    Location: UK

    Take the air filter off to get to the main opening of the carb and squirt something in every hole you can find. I tend to use brake cleaner or air duster with a long straw. This might just dislodge any crap or gunge thats blocking any of the air or fuel ways.

    If not that, mowers usually have a govener that controls the speed usually with a spring fitted. It migth be worth finding this as when you can start it, if you override the speed manually by moving the lever with your hand you can speed the mower up and it might help determine if the engine dying is down to the govner allowing the engine to go too slow and die if you can keep it going longer with a faster than normal speed. Often this govner has a facility to set manually the speed between two levels

    [edit]
    this is what my Briggs and Statton movers carb and govner look like. If yours is different, it might be worth posting the make/model of the engine/mower

    [​IMG]
     
  6. j.col

    Mobster

    Joined: May 31, 2010

    Posts: 4,022

    Location: Bedfordshire

    Have you put fresh petrol in?
    If its last years petrol it can cause this
     
  7. BUDFORCE

    Wise Guy

    Joined: May 3, 2012

    Posts: 1,036

    Check the brake/safety stop.

    Most petrol lawn mowers have like a handle you have to keep held in or the engine cuts out. Check that the cable or the actuator it connects to isn't stuck/seized it can cause that to happen on those.
     
  8. Terminal_Boy

    Soldato

    Joined: Apr 13, 2013

    Posts: 6,516

    Location: La France

    This. Dump the old fuel and fit a new fuel filter before re-filling. As others have said, just all the linkages around the carb are free to move and the choke engages/disengages fully.
     
  9. SeatIbiza

    Hitman

    Joined: Jan 21, 2008

    Posts: 905

    Location: Cotswolds

    Never had trouble with "old" fuel? I've just cracked out the one I use (it's about 35+ years old Honda engine) and it starts first pull, every year with the same fuel that was in it last year....
     
  10. fezster

    Gangster

    Joined: Jan 7, 2007

    Posts: 433

    I used to do the same, but after watching some youtube vids and recently having my mower serviced, the advice is always to use fresh fuel to stop the carb getting clogged up with deposits which develop in old fuel. The holes in the carb are so small it only takes a very small piece to clog it and results in a rough or non-working mower.
     
  11. Gaijin

    Don

    Joined: Feb 18, 2003

    Posts: 8,419

    Location: Brighton/West Wicklow

    It's more prevalent with newer carbs which are built cheaply to the point of being disposable in some cases. Some can't even be adjusted any more.

    And with the ethanol content in fuel, it literally eats things alive.

    After some issues, I will always run the engine to empty at the last cut and my two stroke tools only see Aspen fuel these days.

    They literally don't build them like they used to.
     
    Last edited: May 1, 2019
  12. SeatIbiza

    Hitman

    Joined: Jan 21, 2008

    Posts: 905

    Location: Cotswolds

    This is very true, perhaps that's why my chainsaw (husqvarna) sometimes has problems starting.

    Hadn't heard of this Aspen fuel, but my god it's pricey!
     
  13. Gaijin

    Don

    Joined: Feb 18, 2003

    Posts: 8,419

    Location: Brighton/West Wicklow

    Yeah true, but I'm only running a Tanaka hedgie and one other thing off it at the moment so it's not too bad. Left old fuel in the Tanaka the winter and it wouldn't start.

    I actually have a Ryobi brushcutter which has like a 15 quid carb and that thing is a brute - takes ages to start but always will. Only seems to work for 20 mins though before it seems to go lean and over-rev. Not an issue for me as I can get everything done by then.

    I've a Hyundai 4 stroke push mower which is a beast too works no matter what, but the furniture on it is a bit cheap.

    And then the ride-on which is a Honda - that gets the full kid gloves treatment.
     
  14. Dandle

    Mobster

    Joined: Nov 4, 2003

    Posts: 4,194

    Location: Ashford

    If its a Briggs & Stratton it could well be the carburettor diaphragm. They normally get a little loose after a few years and cause erratic idle and in the end wont let the engine run at all. Only cost a few pounds and are really easy to change.
    https://youtu.be/yoc0ia8rwEE
     
  15. Pho

    Sgarrista

    Joined: Oct 18, 2002

    Posts: 8,897

    Location: Derbyshire

    Does it stall at idle, or stall when you run it into thick grass (e.g., when the engine is under load)? If it's when you run it into grass it's likely the governor like @Kermit suggested.

    The point of the governor is to detect load on the engine and speed it up to stop it from stalling, so if something has jammed with it that would explain it. I had clean up and tweak mine up a year or two ago for the same reason.

    What model mower is it?
     
  16. Nevakonaza

    Mobster

    Joined: Jan 7, 2009

    Posts: 4,442

    Location: Stourbridge,West Mids.

    Sorry for late replied everyone,I had a read on everyones suggested and done everything possible mentioned in here,gave it a good clean all over,cleaned the carb,taken out the spark plug cleaned the tip,and adjusted the Governor a bit and now it starts up first pull and stays running absolutely no problems.
    happy to have it running again thought would be time for a new one.
     
  17. Panda60

    Associate

    Joined: Apr 12, 2019

    Posts: 24

    Try adding a squirt of carb cleaning fluid into the carb before starting.
     
  18. baron02

    Hitman

    Joined: Aug 8, 2009

    Posts: 729

    Location: Canterbury,Kent

    What type of carburettor is fitted ? If it is a briggs and stratton engine with a primer bulb on top of the fuel tank with air cleaner housing at top, These have a diaphragm and gasket, the diaphragm can have a slight pin hole which is enough to cause poor running. These do perish over time which is a part of a service yearly.

    http://tiny.cc/b8g95y

    If it is a bowl type carburettor this will need to be throughly cleaned ie jet removed if removable? if not spray carb cleaner through emulsion jet, If this does not improve poor running, You may have a spark plug problem which can breaking down under load / heat. Change this first..If it still not idling or rough running you will need to look at changing magneto.

    Teach me not to read full thread..:)
     
  19. red eye

    Wise Guy

    Joined: Sep 30, 2011

    Posts: 1,273

    Location: Over the hills and.......

    Italian tune up