Mountfield 46R PD Petrol Lawnmower

[EurIng]

I have a Mountfield 46R PD petrol lawnmower - two years old.
Engine has started hunting / chugging and won't run at high speed.
I've changed the spark plug - no change.
I've checked air intake - all ok.

Any ideas?

 

[wotan]

Sounds like a carburettor problem, either diaphragm or air leak, any reptuable mower service shop, should sort it out easily.

Wotan

 

[EurIng]

Brilliant - thanks for the advice.
Got a new diaphragm from briggs parts & now working normally

Regards