Hunting and pulling me across garden

[Harlequin]

Hi I picked up a Suffolk punch sk14, I've sharpened the blades and fitted a bottom blade, it cuts amazin but it's hunting quite a bit and is over revving.
Any ideas? What carb dies it have.
Thanks.
Stephen

 

[Harlequin]

Pix sorry

 

[bertsmobile1]

Remove & clean the carburettor
Ift that makes no difference remove & clean the fuel tank replacing the fuel line