I have been having a similiar situation with my SU's on my 1275 Bugeye.
I have been using a Colour Tune which really helps me see the condition of
the spark.
My spark which should be "bunsen blue" is running yellow which indicates a
rich mixture. I think that my choke adjustment is off and is pulling the
needles open. So I am going to take a look at that today.
If you can use a Colour Tune and can get your spark to stay blue up through
the rpm range they you will be fine. The spark tends to yellow out as you
increase rpm's - so you have to spend some time with it to get it right. You
might see a bit of yellow appearing as you increase revs, even in a fairly well
adjusted carb - but it should settle back to blue as you stablize whatever RPM
you are at.
If I cannot get mine to behave where I want them - then I will assume I have
some worn parts in my carbs that need attention (on to a Weber Side Draft 45).
Kirk
59 Bugeye in horrid yellow that needs to be painted
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