Well picked up another Model 5 series 1 today, put some fuel in it and give it a couple of pulls and it fired, the needle was not shutting off the fuel and neather was the tap, so give the carb a quick clean out and it runs really well. It does have a strange bottom case letter "S" rather than a number so ?? confused here are a couple of pics.

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I give it a hit with the hose and it come up with a fair amount of good original paint left on it.

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If you dont make a mess you aint making anything.