Help. I bought a flymo petrol driven lawn mower 2 years ago. I have cleaned the plug. It fires for 2 or 3 seconds and then dies. I leave it for a few minutes and then try again. After a few arm wrenching attempts it does exactly the same again. Someone has suggested replacing the petrol with fresh. I will try this but does anyone have any other tips? Incidentally. After the fiorst time it fored, the freshly cleaned plu had oil on it. Ids this sighnificant. Please advise ... I am the only one in the road not to have cut the grass ans neighbours are looking down their noses at me!!