GS1000G Running on 1, 2, and 4 Number 3 remains dead

[Danie.e]

Replaced plug twice, cleaned carbs twice now. All the same jets etc. Compression as follows: 1 = 140psi, 2 = 130psi, 3 = 130psi, 4 = About 135psi - all 4 cylinders still within Suzuki specs. Bike runs on the mentioned three cylinders only. Number 3 plugs come out wet every time I check.

Put number 2 HT lead on 3 and number 3 HT lead on 2 but still same result.

Valve clearances was done a week ago and got most of them to about 0.05mm clearance so I do not believe that it is valve clearances. The number 4 inlet valve clearance is slightly over 0.08 mm because I cannot find a thicker shim to bring it down.

Even if there is a slightly burned valve on 3, it should still run with the usual misfire that goes with it

Anyone ever had such a problem? - maybe time for the junkyard?

[Danie.e]

Found the problem. When removing carbs I always put a piece of rag into the inlet to ensure nothing gets in there while I am working on the carbs. For some dumb reason, I did not remove the rag on cylinder 3
So please do make fun of me, I have it coming

[Redman]

Ha !

Good that you found it.

So your description of the problem could have said "this all started after the last time I put the carbs back on".

Good troubleshooting. You checked compression, and swapped plugs and swapped sparkplug leads, and observed symptoms stay on same cylinder. ....and concluded must be carb related. . . and you were correct.

[cowboyup3371]

One issue you gave yourself now though are those valve clearances. You want them at the upper end near .08mm and NOT .04 or you could be replacing valves soon

[Big T]

Found the problem. When removing carbs I always put a piece of rag into the inlet to ensure nothing gets in there while I am working on the carbs. For some dumb reason, I did not remove the rag on cylinder 3
So please do make fun of me, I have it coming

Ah, your just the 363rd member to make that mistake