12-05-2019, 05:36 PM
Hi Mick
Assuming you are using 14 mm plugs, try to get hold of a Colortune test plug. There should be dozens tucked way in the back of people's garages since their days of popularity in the 1970's. You can then "see" the flame colour to make sure it is blue and not orange.
Apart from all the obvious checks, make sure there is no inlet manifold air leak as this will weaken the idle mixture. An air leak also means that if you adjust the carb mixture to get the idle right the running mixture will end up too rich.
Good luck
John
Assuming you are using 14 mm plugs, try to get hold of a Colortune test plug. There should be dozens tucked way in the back of people's garages since their days of popularity in the 1970's. You can then "see" the flame colour to make sure it is blue and not orange.
Apart from all the obvious checks, make sure there is no inlet manifold air leak as this will weaken the idle mixture. An air leak also means that if you adjust the carb mixture to get the idle right the running mixture will end up too rich.
Good luck
John