Paul,
Try this get a match and bring it to a point. Then put some fine grinding paste on it and put it into the seat section. Turn it around as if you are lapping in a valve to clean the seat.
Then clean again with your carby cleaner and replace the needle.
Regards,
Bruce
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Commercial Outdoor Power Equipment P/L.
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[This message has been edited by Bruce (edited 18 January 2001).]