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Glyn Chambers

Martin, — the longer one is for a different carburetter,not a type 6 series,probably a type 29 ?. check if the carb has any other wrong parts fitted.The type 6 carb has different primary air holes to a type 276,the air holes must line up with the jet block & the jet block must be stamped 51 on the top in both cases.The throttle valve needs to be a No.3 (a 3 1/2 tiger cub one will probably be OK) Potty.