A sure sign of carbon build up in the combustion chamber and/or that someone has put "hotter" spark plugs in there to try and "burn" the oil off them. There has to be something red hot in the combustion chamber to ignite the mixture after the ignition is turned off.
There was some talk about "decarbonising" the combustion chamber by running the motor while pouring a small amount of water or ATF down the carb recently - have a search as it may be worth a try ........


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