Originally Posted by Dan Căta
I have already been where you are now with your bike. It was the same, a 1100 gs. I have tried everything and all should be OK, but the bike ran like crap. It would idle fine and when twisting the throttle, it would die.
The problem was the fuel filter. The owner had some paint on the inside of the tank. It was as if someone put in there 1 liter of paind and twist the tank on all sides so that it would get covered on the inside. Needless to say that the paint came off.
He said the he already replaced the fuel filter, so I left that one alone. After a while, I opened the tank again and cleaned ALL the paint on the inside and put in a new filter. The bike then ran as new :)
I have pretty much gotten all of the loose paint out of the tank and then installed a new fuel pump, including the pre-filter and a new fuel filter. It changed nothing.