> The forward carburetor airflow can't be slowed
> down sufficiently
This seems like the key statement to me. If you can measure too much air
going in the carb intake, then air is getting past the butterfly somehow;
whether you can see the gap or not. A leak anywhere else (or incorrect
float levels, or wrong needle position etc) won't cause too much air going
into the carb intake.
If you are certain that the linkage is free (including the link to the rear
carb being loose), I'd pull the carb, and look directly at the butterfly
while shining a strong light in the other side. Since ISTR you doing some
carb work recently, I'd suspect that one of the screws is loose and the
butterfly has shifted position just enough to hold it open slightly.
-- Randall
triumphs@autox.team.net
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