My First 7

[WJPez]

Excellent, good to hear that it is just a carb problem. you at least know what you are dealing with.
My banjo bolt also leaked. The thread into the carb is often worn and has little strength. It can be helicoiled with care as the surround can split.
New fibre washers help as old ones are often hard and don't seal well. They are standard fibre washers, I got my last ones in one of the multipacks you buy in Aldi etc.
I used some gel type loctite threadlocker (as Simon says, not bearing fit as you won't get it apart again without heat), on the thread and then some araldite around the washer and has held well for about 5 years now with no further leaks.  

good luck
Andy

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Thanks Andy. Thank you to everybody who offered advice. I am going to join my local club tonight. I'm hoping they have some washers for the bamjo bolt in their spares supply.

Wayne