I have here a 1972 T100R with two carburetors. Based upon the information I have, they look like Amal concentric. I have worked on 100's of Japanese carburetors and are very familiar with those products. I don't really understand these and hope somebody can put me on the right track. The bike acts like it has plugged pilot jets (idles poorly, erratically, up and down) but I don't even see pilot jets in the exploded view diagrams I have got? Somebody told me they are in there behind a (Welsh plug) and you have to dig them out or something like that? I have had these carbs apart and cleaned them completely including new float valves, screens, filters, gaskets etc. Any help is appreciated.