THERE IS A SPARK I REPLACED THE PLUG AND FUEL IS REACHING THE CARBURETTOR.
IT WILL ONLY RUN FOR A FEW SECOND IF I POUR PETROL
DIRECTLY INTO THE CARB . I HAVE TOOK THE CARB OFF AND CANT SEE ANY BLOCKAGES ,THE MACHINE IS IN GOOD ORDER.ANY HELP WOULD BE APPRECIATED
AS ITS AN OLD LADIES MOWER AND SHE REALLY DOESNT NEED
TO PAY REPAIR BILLS ,
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Re: MOUNTFIELD PETROL MOWER WONT RUN
If there is a float bowl on this model, takeoff the center screw and look for a little pilot hole on the side and take a small pin or the like and clean this pilot hole and try again to start. Good Luck Pal.
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It certainly sounds like the needle valve is stuck.
If it is a gravity feed fuel system and a normal carburettor it sounds a particularly bad design not being equipped with a petrol tap to isolate the supply when the machine isn't in use. Gravity fed designs without a fuel tap would typically place the fuel level below the engine inlet ports to prevent that potentially dangerous and/or expensive type of flooding. The surplus fuel would then run from the carburettor float chamber vent which if it presented any immediate danger would be piped away.
As part of the investigation and repair it would be a good idea to change the engine oil.
I hope you have no air in the fuel tubes. A vapour lock will not allow the fuel pomp to bring fuel to the carburettor. So make sure the tubes to the carburettor contain fuel, then I hope everything will be ok.
Almost impossible to damage the motor, it only will run fine in the beginning.
carburetor have a setting level for its fuel , check the floating control adjust fuel level , also check spark plug current is there,just by rotating engine and keeping spark plug out of cylinder , just keeping it with engine body.
It fails after it has 10 minutes to warm up right?
I think you should run it till it fails and then test it for spark.
My guess is that your coil is going bad and heat just triggers the failure. After a while even cooling down wont help.
The good news. If you need to replace the coil its a pretty simple job that can be done with a few hand tools and a new coil. It shouldnt be too expensive either. 25-35 dollars for a new one if your shop around online or go to Ebay.
The only thing special you need to do once you have removed the recoil cover and removed the old coil is to take a piece of thin cardboard *(I actually recommend the box the coils usually come in. But a playing or business card will do) Put this paper between the coil and the flywheel to set the coil gap. Tighten on the screws and then pull out the paper. Put the recoil cover back on and you are done!
The first thing to check is the spark plug, is it clean and properly "Gapped" next is are we actually getting spark, does the spark plug actually "Spark". Check. Check Spark Plug lead., Check connections. Do we have Fuel, Check .and Is the fuel getting to the Carburettor? Check. Check the battery. alternator, generator, is providing power. Check the Mixture.