Thank you for this.srankin wrote: ↑Thu Nov 28, 2024 2:53 pmA tricky issue, that could be as simple as the carbs not pulling off of idle at the same time. LOL, in the day when I had hearing in two ears, I could balance or synchronize carburetors by ear alone. Now I use a Twinmax sync unit.
Try adjusting cable pull off from idle and see if you spot anything. Changing the clip position on the needles to richer can really mess up fuel economy, with I have experienced no discernible increase in performance. The factory settings may be a tad towards the lean side but to be honest, I have been setting my carbs for 39 out of the 40 years I have had this bike. On my RS, the same. Of course the 84 R80RT and 78 R100RS euro bike are kind of like apples and oranges in performance. Both get along very well with fair milage. Or I should say the RS did til I totaled it. St.
On the cables: I did adjust them very carefully, so the tiniest bit of rotation of the grip (after taking up the small slack) moves the throttle levers at the same time. I also have a vacuum synch meter I had for my '67 MG Midget (when it was dual SUs), for balancing the idles precisely. But it's so even and smooth that I haven't done that. Idle mixture screws are both at 3/4 turn, which seems best for smooth idle.
On the diaphragms: I agree that these likely are not it. Also, I replaced both with new, so shouldn't be a mismatched issue.
As for the needles: okay, sounds good--thanks for the reassurance and saving me some work.
