Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
If you need the choke to start a warm engine, it sounds like fuel starvation or excess air. Could be blocked jet(s), restricted fuel flow, vent blockage on tank. Excess air, could be flexible mounting rubbers leaking etc.Let us know how you get on. Dennis
Worst were the last white ones built from spares, like the Triumph cardinal