Hello Andy sorry i did not get back to you sooner i couldnt get my phone to send any photos ,I used too, any way the engines are a BUX and the carburetter is an AMAL ,The rotorvator has a yellow domed alloy cover , the float in the carb is brass and does not have a leak so that rules out a leaking float.What about using a paste to grind in a seat like a valve .Im disappointed i can`t send any pictures , Thank you for your time in trying to sort it out.NICK.

Hello Andy, you were right the lapping in did the job , I used cream cleaner and brasso with the male part in the Dremel type drill . THANKYOU.