Thanks all
I took the bike to Suzuki; they fixed the prob. and over charged me for re connecting of some wire.
After this the ECU warning light stayed on and after connecting the ECU to the FR2000 it was re set and all 100% again. During this process I however noticed some moisture in the one spark plug and will assume that this was caused due to the miss fire on the piston, due to the loose wire, and not a problem with the piston rings (mentioned in the service manual). I will however again check this after a few KM just to make sure all is OK.
Regards
Werner