06-07-2018, 08:34 PM
Hi,
The mixture screw only affects the tick over settings.
Its the jets that affect the actual mixture when running.
Its worth checking the float level and the needle valve and its seat.
The needle valve and seat will be worn after 70 plus years which means it will not seal as well as it did when new.
The Ruby head is well known for oiling its plugs. and as Graham has mentioned a change of heat range can help.
The mixture screw only affects the tick over settings.
Its the jets that affect the actual mixture when running.
Its worth checking the float level and the needle valve and its seat.
The needle valve and seat will be worn after 70 plus years which means it will not seal as well as it did when new.
The Ruby head is well known for oiling its plugs. and as Graham has mentioned a change of heat range can help.