Any petrol powered lawn mower gurus?

[Alucidnation]

Morning all.

I have an Alko 42br Briggs & Stratton powered lawn mower.

A few days ago, after starting it (used it just before last weekend and it was fine) the engine was surging and hunting and would would not settle.

After a quick bit of googling i deduced that the carb gaskets could be worn so rather than purchase just the gaskets, i found a complete carb with gaskets etc for £19 so i fitted that thinking it would solve the issue but alas not!!

So, after another bit of investigation, someone mentioned that replacing the govenor and idle springs can cure it.

I must admit, the ones on my mower at the moment are quite slack but i wasn't sure if they should be tighter?

Or should i be looking at other things (that are simple to replace ).

Any help much appreciated, as i now cannot see the dog when i let it out into the back garden/field.


")

[Alucidnation]

Thanks everyone for your help.

I have checked all suggestions and everything looked ok so I bought a couple of springs and replaced those and the hunting has been cured (I think!)

No adjustment can be done on the carb or governor and breather holes on the fuel cap and gasket all clear.

Trouble now is it just runs as rough as hell.

Took the carb off again to give it another clean and found the new diaphragm gasket has a tiny spilt in it around the part where the spring sits.

So, gasket and diaphragm ordered and so ill try that!

[Alucidnation]

Thanks for the links!

Unfortunately my carb is the newer plastic non adjustable type.

Hopefully the new gaskets will be here in the next day or so, so i am hoping that will sort it!

I have also discovered that there is another breather fitted to the engine, so that might be next if the gaskets don't help.

[Alucidnation]

OK, success at last.

Turns out it was the diaphragm that came with the new carb that was casing the issue, as it had a tiny split in it.

Just replaced that and it now runs better than ever!

Thanks again everyone!