Saving Old Seagulls

Thanx for that advice Charles i will give the carb some closer inspection as soon as i have a chance.

Hi, I have a silver century long shaft with an amal carb it starts up easy runs as smooth as silk with the choke in and even after 15 mins or so if you take the choke off once you get to about half throttle it starts to die. Put the choke back on and its fine?
Anyone got any ideas????
Thanx for ...