Thank you both.
I will proceed to the other forum. My motor seems to be making exessive bubbles, eight stroking and sounds real harsh at idle now compared to how it was. Tuning idle etc makes no difference, and is erratic. It also leaks fuel out the intake.
My mistake has been to continue using the plane without solving the problem as it does work perhaps to 80% of its original standard. It never stops on me and makes full power. Due to circumstances I have only flown it twice in the past two years so I have put off fixing it.
West-Oz