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Thanks very much, Mike, for sectioning the idle circuit, good job,very helpful. What is the length of the 2.5mm section hole. Looks like a shouldered rivet could be used to restore the seat and would make a better job than the brass tube I used. I was worried it might partially blank the the carb drilling that runs back to the pilot jet. ...snip....
....snip.... I still feel the differences you are finding between the early/late carbs are just normal production variations. I can't really see any benefits from an engineering point of view. The needle has to be 'bottomed out' to be able to set the 'turn out'. The main problem is the spring strength which makes it difficult to feel when the screw tip just touches the seat and the carb alloy is quite soft, resulting in the orifice being easily enlarged. Another piece in the jigsaw, Brian
Great work Mike on the cross section of the carb!
the later model carb with the two enriching tubes ,one is blanked off at the base from casting .unless mine is blocked with crud it seems to serve no purpose