Try running it without the fuel tank cap on and see if it cuts out then. If not then you have a breather blockage in the fuel system causing a vacuum- thus impeding the fuel flow after it has been running for a short while.
pleasant
September 2008
First change the plug (again) it's not unknown for a new plug to be flakey.
If that doesn't work, suspect a coil fault. They can fail when hot.
phil_saunders@bigfoot.com
Phil Saunders
September 2008
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lawn mowers.