Hi NormK, Thank you for your reply. I put 2 stroke fuel mixture into the fuel tank and not straight fuel so I can discount that theory. The fuel had been sitting in the can for a couple of weeks whilst I waited for parts to be delivered and installed, however I did shake the fuel can to mix the fuel up. The spark plug was new and I ensured that it was sparking before I actually started the mower after the reconditioning. The mower started first go and ran for 30 minutes before it stopped. I will test the spark again. With the mower suddenly stopping and failing to be restarted have anything to do with the cutout Stop/Start wiring as I put on a brand new rubber boot and plug as part of the carby rebuild! The poppet valve that is in my carby had a round flat disc on one end but the poppet valves I have seen in videos show that they have a little prong on the base (see photo) that is used to change the way the poppet valve is secured so that it can be rotated to increase or decrease the revving of the motor. Is this correct? If so should I change my poppet valve to the one shown in the photo?
