ORIGINAL: William Robison
DU:
Then it would seem Rod is mistaken abouot the 4D being from an SF engine. The SF engines I had (matched pair for a twin) were fitted with air bleed carbs right out of the OS box.
Bill.
I don't believe Rod is mistaken about the 4d being from an SF engine. I have an OS ".40SF ABC" and it has the 4D carb on it. BTW I purchased it new back in the 80's so I know this is correct. I also had a .40fp which did have a smaller bore "Air Bleed" carb. as far as I know the fp series had air bleed carbs and the SF series had twin needle carbs.