Dear Experts. I am a complete novice in lawnmower maintenance, I was kindly given an old Hayter 41 petrol lawnmower of which recently it has started to play up. First the engine never started. Replaced with a new spark plug. It then started but only ran for about 2-3 mins max and cut off automatically. It restarted well but kept cutting out. So I have stripped the carb and cleaned it thoroughly but problem still persists. I then replaced with a new air filter and new carb. Now the engine starts and can stay running for as long as I want it to. However, if I cut off the engine and tried to restart, it failed. Upon checking the spark plug, it covers with black soot and if I clean it, I can restart but only once. This does not look right and I should not need to clean the spark plug each time I want to restart the engine. I read from various sources that this is to do with the excessive fuel intake that causes the blackened spark plug (?) If so, is there a way I could manually adjust the amount of fuel intake please?Or am I looking at the wrong place? I have attached a photo of the lawnmower and the throttle. I appreciate your knowledge and kind assistance. Thank you in advance.
