ECT sensor problem
 

Well after afew weeks of seeing my fuel consumption go through the roof my bike then decided to flood and not work. I changed the plugs and got her running again but it still cuts then is a git to get running again with lots of black smoke (fuel) coming out with afew loud back fires.

Has anyone else had this problem with the sensor thinking its colder than it is thus putting more fuel through the system or could it be my air filter (k&n recharged 3k ago) causing this or anything else?