...... Thanks guys,.. the carbs. are fairly new. and I have had them apart many times, changing main jets, pilot jets, and the height of the needle jets and float levels.
I do use compress air with wd40 to clean, every time. ..... one thing about the Mikuni 38mm F/S's,... they have very few parts.
I do believe, that some of the problem with the throttle sticking wide-open is, high vacuum pressure. even with the push-pull system..... the new motor, creates a tremendous amount of vacuum.
so, I am not sure, if this can be fixed. I heard some where, that Mikuni stop building flatslides, for the street..... just for that reason.
Keihin F/s's, have ball bearing on thier slides. but, they cost, almost twice as much as the Mikuni's. and, I also heard, that they are a bear to keep tuned.
what to do ??