success , hurray , replaced the fuel in the tank , rinsed with a bit of fuel . lots of small black bits came out . filled with new 25:1 mix . filled tank to just above fuel filter , half full i suppose . mowed my whole slope again , mower never stopped or tried to . thought i tried half full first , well it works .
thank you Bruce looks like the fuel or blockage was the problem . Seanw you might try that too . cheers to all on this wonderful site