Vacuum Leak?

My throttle will not return to idle very quick, and know this is a symptom of a possible vacuum leak among other things. I have replaced both intake and manifold rubber mounts, rebuilt and cleaned carbs well, checked but not replaced throttle cable. The 4 small rubber seals on my choke assembly are either damaged and 2 are completely torn, would this be enough to cause my idle and throttle response issues. If not other suggestions are welcome. Thanks Don

What kind of carbs? If the CV (constant velocity) the rubber diaphrams on top of the carbs may be torn. This is possibly due to the Alcohol/Gasoline mix being sold just about everywhere. It's attacking the rubber pieces of the bike fuel systems.

BIGD wrote: My throttle will not return to idle very quick, and know this is a symptom of a possible vacuum leak among other things. I have replaced both intake and manifold rubber mounts, rebuilt and cleaned carbs well, checked but not replaced throttle cable. The 4 small rubber seals on my choke assembly are either damaged and 2 are completely torn, would this be enough to cause my idle and throttle response issues. If not other suggestions are welcome. Thanks Don

If not already done, would that the automatic timing advancer is functioning properly, and isn't sticking or binding due to rust or corrosion or whatever.

The advancer unit may require lubing or both cleaning and lubing.

Viewed under a strobe timing light, the advancer should quickly move back and forth as rpm is varied by blipping the throttle.

It might be that rust/crud/gunge is preventing the advancer from immediately and fully closing as it's supposed to do when the carb throttle slides are closed.

Good Fortune!

BS34 and the rubber diaphram's seem to be fine.

Timing advancer is clean and lubed.

BIGD wrote: My throttle will not return to idle very quick, and know this is a symptom of a possible vacuum leak among other things. I have replaced both intake and manifold rubber mounts, rebuilt and cleaned carbs well, checked but not replaced throttle cable. The 4 small rubber seals on my choke assembly are either damaged and 2 are completely torn, would this be enough to cause my idle and throttle response issues. If not other suggestions are welcome. Thanks Don

Are all the o'rings on pilot air screws in good condition?

The 4 small rubber seals on my choke assembly are either damaged and 2 are completely torn, would this be enough to cause my idle and throttle response issues --- Would test for air leak in the usual manner, by spraying WD40 or carb cleaner in the areas leading to the seals, while engine is running at idle rpm, and watch for noticeable change in rpm or smoke from the exhaust, which would indicate that the spray is being ingested.

Good Fortune!

O-Rings are brand new. Thanks