Picked up an old Suffolk super punch last year. Its a bit blunt but runs nicely most of the time. It tends to stall when it gets loaded up (long grass for example) even when moving slowly. If I keep the choke open (as when cold starting) it runs perfectly, although I’m sure it’s not good for it to be running rich all the time. The spring mechanism thing on the top of the carb appears to be moving around as it should, is this likely to be a carb problem or something else?
Also, any ideas around what year this one was built? I can’t see any dates on it, but from what I’ve picked up I think it’s ‘60s. I’ve given it an oil change, new plug and had to replace the fuel tap (leaking after a bodged repair of the cork bit by previous owner) but it goes ok for an old bit of kit!