P.O.S lawn mower problem, its brand new.?

Its not literitly brand new, but it has under 4 hours on the engine. Ive only cut my yard twice with it (1.6 acrs)
Its a Yard Man by MDT 139cc/ 22" Self-Propelled Side Discharge Mower

It starts fine but as soon as it reaches operating temp (in 5 minutes) it starts spuddering and flat out stops. Then if you wait 10 minutes and start it again it will run fine then stop again after 5 minutes. What do you think it is?

Comments

4 Responses to “P.O.S lawn mower problem, its brand new.?”
  1. Richard D says:
    June 30, 2009 at 10:17 pm

    Either you put some bad gas in it (water in the gas) or you need a new spark plug at a cost of $2.00

    Your symptoms sound like a spark plug. Remove the plug wire and use a socket wrench or an adjustable wrench and unscrew the plug out. Get the numbers off it or take it in to purchase a new one.

    Also make sure you have the proper oil level, too much, or too little will be chaotic on the engine. If you put too much oil in reservoir it could of fouled your plug up (ie end of plug will be tar black) making it not wanting to start or stalling

    If you think you put bad gas in it just turn the mower on its side, cap off, and drain the tank dry, and then put new gas in it.
    10-15 minutes to do both.

    Good luck

    RD

  2. Bill M says:
    June 30, 2009 at 10:17 pm

    If it’s new, it should be under warranty. Maybe the choke isn’t opening.

  3. SmartA$$ says:
    June 30, 2009 at 10:17 pm

    could be any number of things:

    If it has a choke feature, make sure you are taking the choke off after it starts, I’ve seen people who left it on and it can make the mower run like crap (or stall).

    It could be a loose muffler, wait until the mower is cold and make sure the muffler is on good (make sure all the screws are tight). If the hot exaust can’t get out of the engine it creates back pressure on the valves which can stall the engine or make it run poorly.

    It could also be a cracked block, if this is the case the mower is shot and you should return it before the warrenty expires. What happens is as the metal heats up, it expands, so the crack opens up. this allows the pressure in the cylinder to vent through the crack, rather than pushing the piston down, therefore the engine runs poorly or stalls.

    You might also try completely draining the gas tank and filling it with fresh gas. If it sat in a shed over the winter, there could be water in the gas. after it runs a few minutes the water gets stirred into the gas and makes its way into the engine causing it to stall.

  4. Carl says:
    June 30, 2009 at 10:17 pm

    Check out the choke. The choke maybe making it run to rich.
    I don’t think you have a dirty air filter but that could make it run rich too.
    Check the oil. Put some 30W oil in it. Maybe your oil is to thin and it heats up.
    Check the fuel filter.


 
Powered by WordPress Lab