Help Cylinder 1 sputtering and wetting plugs - CBR250RR

This is my first post on a forum so sorry if the formatting is wrong.

To start with my bike is an mc22 CBR250RRR (as seen in my dp) and I have a few problems with 1 cylinder that I cannot work out. Cylinder 1 keeps fouling with fuel and sputtering while i hold a constant speed at say 1/8 to 1/4 throttle. When i first start up the bike it runs and revs on all 4 cylinders but if i leave the bike to idle for more than say 30 seconds the spark plug is wet to the point that it doesn't fire, it also smells really fuely (is that a word?). after it does this i have to ride it hard until it decided to kick back in which is usually within 30 seconds of riding. The pilot setting currently is at 2 1/8 as the service manual says, it also has cr8eh9 spark plugs in it which seem to foul a little less. That is the first problem i have which may also be the cause of the second problem which is the surging at low throttle.

Basically while i ride regardless of rpm or temp that same cylinder feels like its cutting in and out only while Im maintaining a constant speed, it runs perfectly if the throttle is half way or wide open with no missing or hesitation, the problem only exists when there is low throttle. The feeling is like its bucking forward and the noise of it cutting in and out is really noticeable. Im completely out of ideas at this point so Im turning to the forums for help, the things I have tried so far are as follows:

-Clean all passageways and balanced carbs
-Replace all jets, float needles and gaskets
-Change spark plugs (twice)
-Check for vacuum leaks by spraying starting fluid around the carb and listening
-Changed all the slides and needles
-New air filter
-Fiddled with the pilot screw each way to see if anything changes

Thats all i can think of that Ive done off the top of my head any help would be greatly appreciated.
Cheers,
Hazz

 

Thanks for the prompt reply!
Could that cause the sputtering at low throttle only? Ive taken out the leads and tested then with a spark plug touching the case and there is spark there, Not sure what its meant to look like but it looked small and purple in colour.

 

Ill try trimming the leads now and let you know the result. Thanks for that tutorial GreyImport!

 

UPDATE:

I cut down the coil leads at the spark plug side and cleaned the contacts which didn't seem to make much difference. I ordered one of the mentioned thermometers from eBay so hopefully i get that next week sometime. I made some progress though by turning in the pilot screw all the way and then out about a quarter turn on cylinder 1s carb only the sputtering seems to be a lot less but still there slightly. My theory is that the choke circuit may be leaking fuel in some way making it run really rich at idle, can anyone shed some light if this is a possible cause? Im fairly sure now its not the coils but haven't ruled them out all together.

I want to thank everyone for their responses, its been a big help.

 

I dont think the floats are adjustable on the mc22 carby could be wrong though.

 

Great info cheers ill give the fuel screw tuning a try tomorrow. The fuel screw is set up as per that photo

 

Do the plugs at the coil side unscrew like they do at the boot side?

 

Having a fiddle today and turns out the coil side of the wire does just unscrew and pop right out!( If anyone was wondering)

 

UPDATE

Checked all the resistances of the coils and they were all within spec. I also replaced the choke plunger thing but still if i leave it to idle the plugs foul up and end up black and soaked in fuel...