So I have finally done some more work on the mower. I got the special bolt to remove the seat which was actually pretty simple. I then pressed in the new seat.

the seat in the carby kit was wrong so I also had my friend in the US send the correct needle/seat kit with the bolt.

Installed the new needle and replaced the fuel bowl gasket from the carby kit. I then adjusted the "tang" so that the needle closed the seat when it was meant to... so all good on the flooding front :-) YAY

But alas, the bloody thing would not start. tried so long it melted the earth wire to the engine (fixed that with some thicker wire) but still no joy.

so out the with plug, connect to the lead and sat it on the chassis so it was earthed. cranked it over and no spark... had a new plug and it made no difference..

so perhaps the magneto is buggered. not sure how to test that?

Nathan