Just looked at the posting on the Wal Phillips fuel injector and I remembered that there was an article about fuel injectors in one of my 1960s Scooter and three Wheeler mags. I found it on page 14 of the May 1966 one. I also found an old pirelli ad on pages 2 and 3 which reminded me of happy days on the beach with my scooter (GS150 at the time. Sorry!) in the mid 60s.