Possible causes for no idle.

[Sun Wukong]

GS500 twin.

Cuts out when you stop/pull up, or when sat at traffic lights/roundabouts.

No problem if you hold on revs slightly when stopped.

Will die on choke too. Revs hard as normal and then suddenly bogs off and dies (within 2 seconds).

Idle speed set any higher means it revs high once warm.

Engine fin3 when moving
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Top cat
"Hard times lead to hard people. Hard people lead to good times. Good times lead to weak people. Weak people lead to hard times." Smegballs
"Oh and STE balloons would be one of the nicer things we would receive at the office, the amount of dog turd in jiffy bags is not funny." Jsmith86

[CaNsA]

Wrong pilot jets?

[pompousporcup...]

whats that there air filter looking like? Clogged air filter (or over lubrimacated) will starve the idle circuit... when you throttle on the butterflies open up allowing more air to flow and overcome some of the airflow restriction.

Quick test. See if it idles without the air filter fitted

[Loui5D]

Didn't you have this same issue at the BBQ?

[Sun Wukong]

[pompousporcup...]

Did you spray too much air filter oil onto air filter?
have you changed any settings? IE tweaks to the mixture screw? Had the carbs apart at all in your ownership?

Carbs have got me right in the eye atm. Seems like they are all i deal with on my projects

[pepperami]

Valve clearances have closed up ? A bit?
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[Sun Wukong]

Robby fiddled a lot with carbs to sort out balance. Have been looked at many time.

One float valve was sticking so I fiddled with it a lot and got it pinging nicely, but a concern.

Float heights have been changed by both Robby and I, I will be checking those when I strip her tomorrow.

I've come dangerously close to checking the clearances many times, but have been dissuaded every time by friends helping me. Thing is its shims, so I think no one wants to hel if it needs it its only got 23k and more than potent once actually going so unlikely to be them - but annoying I can't state definitively.

Any electrical causes?
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Top cat
"Hard times lead to hard people. Hard people lead to good times. Good times lead to weak people. Weak people lead to hard times." Smegballs
"Oh and STE balloons would be one of the nicer things we would receive at the office, the amount of dog turd in jiffy bags is not funny." Jsmith86

[Sun Wukong]

[nowhere.elysium]

[chris-red]

Worth Seeing how it runs if you leave the fuel tap on prime. The fuel taps on these are shite and cause all manor of issues.
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[Sun Wukong]

Valve clearances are one of the few jobs I have never found a mate willing to do in his spare time. All other ones are just a pleasant diversion... that seems to genuinely scare/upset people.

Rubbers are stiff, but workable. Revs do not rise when aerosol sprayed round the carb, any time that has been checked.

Carb balancing ports (on carb outlets to engine) have both been sealed, but still suspicious of them.

Will check the vacuum hoses VERY well tomorrow, and test run on prime as suggested (although that does risk much petrol in engine and an oil change if not careful ... SWIM had that happen to them recently)

Any other ideas for what might cause the above symptoms?
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Top cat
"Hard times lead to hard people. Hard people lead to good times. Good times lead to weak people. Weak people lead to hard times." Smegballs
"Oh and STE balloons would be one of the nicer things we would receive at the office, the amount of dog turd in jiffy bags is not funny." Jsmith86

[nowhere.elysium]

[bypass2]

Ive just recently got a gs500e it would not stay on idle and cut out. revs allright took the carbs of cleaned them.left the carb bottoms off blew down the petrol pipe to the carbs moveing the floats up/down bit of crap came out put them back together stays on idle now. noticed on the inner side of the petrol tank theres another petrol tap is that working allright

[Nobby the Bastard]

I wouldn't have thought that tight clearences whould cause a poor idle when warm, it usually manifests itself as being a fucking bastard to start when cold but fine when warm.

I'd be looking for an air leak on the manifold. Have you tried spaying WD40 at the manifolds and seeing if the revs pick up?
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[bypass2]

Have you tried letting the engine warm up for a little longer before you go on your journey.

[Sun Wukong]

[pompousporcup...]

Its possible there is an air leak somewhere, like from a vacuum port for example, but you would almost certainly hear that and it would run like a bag of spoons

Can you video what is happening at idle and upload it?

[Nobby the Bastard]

[pompousporcup...]

[Sun Wukong]

Videos are filmed, getting uploaded now. Slowly.

Expect some NSFW swearing. Because I'm 'ard.
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Top cat
"Hard times lead to hard people. Hard people lead to good times. Good times lead to weak people. Weak people lead to hard times." Smegballs
"Oh and STE balloons would be one of the nicer things we would receive at the office, the amount of dog turd in jiffy bags is not funny." Jsmith86

[Sun Wukong]

Videos uploaded

Started on button first time from cold (not used since Monday ie 48 hours plus)

Vid 1 here

Some sweary so careful at work.

Does not start again after letting it bog out, which is what it does on the road too (ie when warm). At roundabouts/traffic lights etc, throttle must be blipped slightly to keep her going.

After video cuts off, I went outside to not die from fumes. Came back one minute later and she started first time. Choke on full, and after some time eventually would stay on the choke without me blipping the throttle.

Vid 2 here

Warmed up enough to have filled the shed with much non-air, stalls as soon as choke is turned off.

As mentioned in vid and normally, turning the idle speed up sadly is not the answer... although it is damn tempting I admit. When I do that, about 15 minutes after setting off she is revving very high and being a dick going in to roundabouts etc.

---

This was the initial state of play some time ago.

https://www.bikechatforums.com/viewtopic.php?t=320727

Fixing airleak in vacuum hose, removing scottoiler, new sparks and air filter, balancing carbs and further fiddling with float height etc helped it a lot.

This cut out thing is new, and frustrating.
____________________
Top cat
"Hard times lead to hard people. Hard people lead to good times. Good times lead to weak people. Weak people lead to hard times." Smegballs
"Oh and STE balloons would be one of the nicer things we would receive at the office, the amount of dog turd in jiffy bags is not funny." Jsmith86

[Teflon-Mike]

I tappets have never been done, and from memory the GS uses old fashioned screw and lock-nuts that are easy to 'do' but awkward to get at, and need doing often... then tryng to dodge that issue looking for carb issis is a bit of an ostritch act, to my mind, looking for more convoluted jobs and fixes to avoid the easy and obvious!
Bite the bullet.. tickle tappets.. THEN see whats what.
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[Nobby the Bastard]

[Sun Wukong]