my kawa gpz 600 r goes in the run to the red area

hello have such a problem with my kawa gpz 600 r and that is I changed the temperature sensor in the thermostat housing because the old was defective. cool water changed and the fan switch at the bottom in the cooler with a switch bridged. now the problem is that if I run it warm that it goes after not even 2 min into the red area….what can that be? please answer quickly…be with my Latin at the end….bastel is 1 1/2 years and finally get to do. and nu n the problem thanks already for the answers