Bruce,
I have changed the air filter and plug.
Mower started beautifully first pull but this is normal.
Ran it for 5 minutes, turned it off and it would't restart.
Took out warm plug and put in cold old plug and started ok. Ran it for 5 minutes, turned off and no restart.
Put in another old cold plug and it started ok. Warmed for 5 minutes but no restart.
I am very confused and frustrated. The spark however appears to be an orange to yellow colour and not blue, however this may just be my eyes playing tricks during a bright day.
It appears that it will not start once the plug has become hot.
What do you advise for the next step?
Rod.
