I am stymied....vacuum leak.

[93Bandit]

If only it was that easy. The problem developed before the new mounts and diaphragms.

Here is a little more feedback.
Turned the pilots out to 21/2 turns, ran the bike till warm and adjusted to lean best idle. I could turn #1/3 screws almost all the way in and not much change….this is not right……hmmmm

Well bummer. Figured it was a long shot but didn't want the chance of withholding a suggestion from keeping you from fixing it.

[gustovh]

I start soaking carbs tomorrow, should see some results in about a week.

[Suzukian]

Have you checked your valve adjustments in a while?

[gustovh]

Have you checked your valve adjustments in a while?

Yes it’s the first thing that I do.

V

[Suzukian]

If you are spraying starting fluid, and getting no change (I always make sure I have the little Red Tube on the Spray can) so I can isolate where I spray, but if you aren't getting any change in you idle, then it is not an intake leak. The response on the smallest of leaks is definitive and fast. I asked about the valves as my GS750ES has cam followers with the locknut and square head screw, and I wasn't paying attention the way I should have, and tightened them to tight, boy did that bike run like cr@p

[Nessism]

I start soaking carbs tomorrow, should see some results in about a week.

Don't over soak. It damages the throttle shaft seals. Soak for the minimum time necessary to make sure all the passages are open.

[Suzukian]

X2 on that and also about what Nessism asked about syncing the carbs. It is so very important. Also, that is the beginning of the era of cold blooded bikes, so don't try to get too low of of an idle out of it. The manual will tell you the proper warm idle speed, I think it's around 1000 rpm.

[Buffalo Bill]

Old carburetors of course. Find another carb set and try again?
Changes with warm up so maybe metal expanding around an old seal.
The throttle valve shafts leaking air?
Dipping removes blockage, that's not the problem. You got leakage.
Old air screws? Tiny O rings there dried up? Assembled wrong?

[gustovh]

I do an overnight soak on carb bodies then a sonic wash and hot water rinse and blow dry with high pressure air. Valves are set per manual. all O rings replaced.

I might add that I have owned this bike since 2002 and this is the first running problem like this that I have had. Mileage is somewhere around 40,000

[Nessism]

I do an overnight soak on carb bodies then a sonic wash and hot water rinse and blow dry with high pressure air. Valves are set per manual. all O rings replaced.

I might add that I have owned this bike since 2002 and this is the first running problem like this that I have had. Mileage is somewhere around 40,000

I use Berryman's "professional" formula, and soaking just a couple of hours results in sluggish throttle shaft movement because the shaft seals swell up so badly. They usually shrink back down after drying out, but just saying, that Berryman's dip ain't good for the seals.

[gustovh]

I use Berryman's "professional" formula, and soaking just a couple of hours results in sluggish throttle shaft movement because the shaft seals swell up so badly. They usually shrink back down after drying out, but just saying, that Berryman's dip ain't good for the seals.

I use Napa carb dip….haven’t had any trouble with it. The issue started on my way home on a 700 miler, it started off slow and gradually got worse every time I had to stop. Been fighting it ever since.

V

[Buffalo Bill]

If you have another carb rack, you could try it on the bike; to test if the problem is the carb rack or other.
I have a similar problem with my GSXR carbs. Just bought another rack to try, (next spring).

[gustovh]

If you have another carb rack, you could try it on the bike; to test if the problem is the carb rack or other.
I have a similar problem with my GSXR carbs. Just bought another rack to try, (next spring).

If only I did.

V

[Buffalo Bill]

If only I did.

V

If you still have that 1000G and it's running good, I'd try swapping the rack over for a test, if it fits.

[Suzukian]

If the throttle shafts were sucking air, the Starter Fluid would have revved up the idle big time..