Alas Another Uncle Phil ST1100 Mystery Thread

On my 97 st1100 it was the rear left cylinder or #4 that was flooded.

If you are still getting the "buzz" sound it's probably not a hydro-lock as that sound is more like a "solid clunk". It can't hurt to pull the plugs to be certain.
 
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****DING DING DING DING****

WE HAVE A WINNER!!!!!

@Mike M. - Hydrolock on the back two cylinders.
I did put rags over them but they blew off and gas shot across the shop in both directions.
Never encountered that before on a ST1100 so thank you for your insight.
At least I have 'tested' a starter and a starter relay that I now know for sure they are good. :biggrin:
Now back to your regular scheduled programming .... ;)
And back to trying to resolve the original carb issue.
 
ST1100Y said:
right... but the vac operated fuel petcock is an "unnecessary nuisance"... :whistling: 🎶
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Yes it is - at least we agree on that! :biggrin:
I had installed a set of carbs that were supposed to be 'good' and obviously they were not.
The petcock would not have stopped the bad carbs from flooding the cylinders.
My guess is the floats were stuck open ... ;)
 
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Uncle Phil said:
Yes it is - at least we agree on that! :biggrin:
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Nah... in this we don't ... ;)
Uncle Phil said:
I had installed a set of carbs that were supposed to be 'good' and obviously they were not ... ;)
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Did you inspect and overhaul them or just dropped them in with good faith without even looking? :unsure:

Anyhoo... besides a throughout carb overhaul I'd suggest an oil change too as its likely diluted with fuel now...
 
ST1100Y said:
Nah... in this we don't ... ;)

Did you inspect and overhaul them or just dropped them in with good faith without even looking? :unsure:
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Good faith without even looking! ;)
Sometimes faith is rewarded sometimes it is not ....
 
Next question for you carb wizards -
The pair system has been removed from this bike long before I got it.
Out of the base of the carbs there are 4 air line nipples turned upward - one about on each corner.
They connect to a series of hoses that sort of 'circle' the top of the carbs.
Are they part of the original pair system or do they serve a carb venting function?
I would not remove the pair system personally but I am hunting down a vacuum leak on this one.
So I would like to block off as many 'unneeded' vacuum connections as possible.
 
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Uncle Phil said:
****DING DING DING DING****

WE HAVE A WINNER!!!!!

@Mike M. - Hydrolock on the back two cylinders.
I did put rags over them but they blew off and gas shot across the shop in both directions.
Never encountered that before on a ST1100 so thank you for your insight.
At least I have 'tested' a starter and a starter relay that I now know for sure they are good. :biggrin:
Now back to your regular scheduled programming .... ;)
And back to trying to resolve the original carb issue.
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huh, I was right? Shhh, don't tell the wife...never mind she wouldn't believe me anyways.

Glad you found it and it wasn't so bad.
 
Glad that sorted this out quickly Phil, but I am left a little confused at the same time. In your first post you wrote that you had been chasing a carburetor issue. Because of this my very first thought was hydrolock and I was about to suggest this yesterday in what would have been post #4 but there was no point once I had read that JD had already suggested it in post #3. When I saw your reply that the plugs and oil level look fine this indicated that hydrolock was not the problem. If the cylinders had liquid gas in them one would expect to find that the plugs are wet also. They were not?
 
Uncle Phil said:
Good faith without even looking! ;)
Sometimes faith is rewarded sometimes it is not ....
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Trust but verify.
Never mind me, I don't know squat about carburetors.
I have 2 FI bikes that run, and 2 with carbs that don't (of course, they are basket cases awaiting reassembly, but still), and a riding mower with only one carb, that I can't start.
I just have always liked that quote.
Glad you're on the way to richer riding.
 
Andrew Shadow said:
Glad that sorted this out quickly Phil, but I am left a little confused at the same time. In your first post you wrote that you had been chasing a carburetor issue. Because of this my very first thought was hydrolock and I was about to suggest this yesterday in what would have been post #4 but there was no point once I had read that JD had already suggested it in post #3. When I saw your reply that the plugs and oil level look fine this indicated that hydrolock was not the problem. If the cylinders had liquid gas in them one would expect to find that the plugs are wet also. They were not?
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The two fronts ones were not - the two backs ones you have to fuss with the upper fairings to remove them.
And that, of course, was where the issue was - as always.
Still got carb issues and these are the 'original' carbs that were working reasonably well before I swapped them.
I swapped them to see if that was the surging issue but the other carbs were obviously not good though I was told they were 'really good'. ;)
 
Uncle Phil said:
... the two backs ones you have to fuss with the upper fairings to remove them.
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Not with this gem:

wrenchplug165_big89216MT3000-01_8dc2.jpg


upgrade with a gadget like this:

shopping


and you're set...
 
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