Doesn't drop back to idle right away...???

[Hammerhead1st]

Ok...synch'd the carbs in prep for the Syracuse meet n greet, and suddenly, the bike wont drop back to idle right away. Instead, it seems to hang at high r's for a few secs, then drops back to idle.

All the mix screws are set at 1 1/2 out, all carbs are synch'd damn near perfectly. Thought it might be a sticky throttle issue, but no, it isnt. Any ideas?

[prometheus578]

Check for a vacuum leak. Probably with your 25 year old vacuum port caps from when you synch'ed her.

[Hammerhead1st]

I replaced the caps last month with brandy-new ones, but will check for leaks anyhow...Thanks man.

[blue giant]

I had a similiar problem last weekend when I synced mine, turned out I wasn't synced at all, one of the butterflies (Carb #4) was closing sooner than the rest causing the idle to hang up. Sometimes a blip of the throttle would bring down, sometimes not. I didn't find the problem until I removed he carbs and could visually see what was happening.

Hope this helps,

Paul

[Hammerhead1st]

Paul,

How'd you fix it? Pre-synch?

[blue giant]

Originally posted by Hammerhead1st
Paul,

How'd you fix it? Pre-synch?

Yes, the wire twist tie method.!

Worked very well too.

Paul

[Crazcnuk]

I had the same problem, and it was the throttle cable. It had started breaking up at the throttle grip.

It broke a couple days later.

[xsilerating]

You may want to try turning down your fast idle screw - just a tad - your adjustments may have resulted in a very slight increase on the 'rich' side.

I've had this happen a couple of times, the last after a mechanic adjusted the carbs for me.

Ron

[AlanB]

Hi Hammerhead,

Still sounds like a synch problem....... What did you use to synch 'em?
I have had problems with almost every set of "Gauge-type" balancers I have tried........... If you use "gauges", try swapping 'em onto different cylinders after you have finished; The results can be quite illuminating!

AlanB

[79XS11F]

If the throttle cable is not sticking and adjusted properly then check for smooth operation of the butterfly valves and if their good then you most likely have a air leak to find and plug.
Rob