Seems that most of the PO bodges people have mentioned are rather
obvious. I just ran into one on my TR-4 that was cute and well hidden.
The throttle shafts on my carbs were very worn (can you say 1/16th inch
lip?), so I decided to treat my car to a carb rebuild, including
re-bushed shafts. The car ran better, but not that much better. A check
with my new ColorTune (my mother-in-law thought the idea of a spark plug
with a window in it was so funny she bought me one) showed rich running
no matter how I adjusted the jets. Turns out the PO had installed a
different needle (non-standard - I could not even find the number in the
Haynes SU carb manual) that ran rich to compensate for all the air
leaking in around the throttle shafts.
Mark "waiting for some new needles" Clark
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