Same thing happened with my 127.....which has a metal cap with a cork gasket, or should I say HAD a cork gasket. It fell in the tank and crumbled into fine pieces, eventually making it through the screen in the sediment bowl and into the carb.
Cleaned all that junk out, and no more problems.... Sounds like your issue is something similar
Jeff (teet)
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CCC 1211
71
127 
102
122
1962 Original
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